Double Star Calculator - Results


Discoverer & Number: STT 72 AB -> DSCALC Archive
Gaia Source ID - Star A          : 46741446184164224    Simbad
Gaia Source ID - Star B          : 46741652342594304    Simbad
Observation Epoch : J 2016.001 / 2016-01-02 Angular Separation : 4.674" ± 0.0403 mas Position Angle : 327.91 ± 0.00060 degrees
Star A/B Epoch : J 2016.000 / J 2016.000 Angular Separation : 4.674" ± 0.0403 mas Position Angle : 327.91 ± 0.00061 degrees LB of Projected Separation (AU): 637.65 AU Spatial Separation (pc) : 1.48 ± 1.12 pc Spatial Separation (ly) : 4.82 ± 3.67 ly Proper Motion Angular Difference : 6.38 ± 1.39 degrees Total Proper Motion Difference : 0.91 ± 0.07 mas/yr Tangential Velocity Difference : 0.68 ± 0.08 km/s

Aladin Lite Sky Atlas



Star A
Gaia Source ID                   : 46741446184164224  Simbad
Epoch : J 2016.000 Right Ascension (RA) : 04h 07m 59.43s Declination (Dec) : 17° 20' 23.48" Distance (pc) : 137.90 ± 1.07 pc Distance (ly) : 449.76 ± 3.48 ly Magnitude (Gaia G-band) : 5.33 mag Absolute Magnitude : -0.37 ± 0.04 mag Spectral Type (color index) : K Luminosity (solar luminosities) : 103.73 +3.76/−3.63 L☉ Mass estimation (solar masses) : 6.92 M☉ RUWE : 1.04 Position Angle of Proper Motion : 138.17 ± 1.31 degrees Total Proper Motion : 13.19 ± 0.06 mas/yr Total Proper Motion (Gaia) : 13.19 mas/yr Tangential Velocity : 8.63 ± 0.08 km/s Radial Velocity (Gaia) : -31.84 ± 0.13 km/s Space Velocity : 32.99 ± 0.13 km/s
Star A - Double Star Quality Metrics
Parallax over error :    129.230 : very good
RUWE                :      1.040 : good astrometric fit (single star)
Duplicated source   :      false : single source
G magnitude         :      5.328 : G > 3 mag, photometry reliable
Excess noise        :      0.338 : poor fit, model deviation significant
  Significance      :    139.357 :   possible double star, motion, mismatch
BP-RP excess factor :      1.300 : photometry inconsistent
Visibility periods  :         13 : high, indicates well observed star
IPD multi-peak frac :         0% : single peak detected
IDP GoF harmonic amp:      0.056 : slight indication of structure

Star B
Gaia Source ID                   : 46741652342594304  Simbad
Epoch : J 2016.000 Right Ascension (RA) : 04h 07m 59.25s Declination (Dec) : 17° 20' 27.44" Distance (parsecs) : 136.42 ± 0.35 pc Distance (lightyears) : 444.95 ± 1.15 ly Magnitude (Gaia G-band) : 9.79 mag Absolute Magnitude : 4.12 ± 0.01 mag Spectral Type (color index) : G Luminosity (solar luminosities) : 1.66 +0.02/−0.02 L☉ Mass estimation (solar masses) : 1.22 M☉ RUWE : 0.92 Position Angle of Proper Motion : 131.78 ± 0.47 degrees Total Proper Motion : 12.28 ± 0.02 mas/yr Total Proper Motion (Gaia) : 12.28 mas/yr Tangential Velocity : 7.94 ± 0.03 km/s

Star B - Double Star Quality Metrics
Parallax over error :    385.402 : very good
RUWE                :      0.920 : good astrometric fit (single star)
Duplicated source   :      false : single source
G magnitude         :      9.791 : G > 3 mag, photometry reliable
Excess noise        :      0.077 : poor fit, model deviation significant
  Significance      :      5.997 :   possible double star, motion, mismatch
BP-RP excess factor :      1.350 : photometry inconsistent
Visibility periods  :         13 : high, indicates well observed star
IPD multi-peak frac :         0% : single peak detected
IDP GoF harmonic amp:      0.055 : slight indication of structure

Double Star plausibility checks

Check separation:
Spatial separation : 304584.7 AU, with an uncertainty range of [ 72692.9, 536476.5] AU
Probability for a physical pair: Close to or zero (Nominal) / Close to or zero (at lower bound of uncertainty)
Separation-Based Evidence factor: 0.026 (Nominal) / Flag: normal

Check proper motion:

Relative Proper Motion Angular difference: 3.55 %
Relative Total Proper Motion difference: 7.43 %
Relative Tangential Velocity difference: 8.59 %
Estimated CPM Probability: 88.93 %
CPM-Based Evidence factor: 0.791

Physical Binding Evidence:
Combined Physical Binding Evidence factor: 0.026

Check RUWE parameters:
RUWE probability for a binary system (Star A): Zero
RUWE probability for a binary system (Star B): Zero

Separation and position angle as a function of Julian Epoch

-- For epoch J[1900-2100], computed using Gaia proper motions --

Click to expand/collapse - Separation and Position Angle for J-Epoch:
Epoch      Sep[″]   e_Sep[″]    PA[°]     e_PA[°]
-------------------------------------------------
1900.0      4.536    0.007     326.188    0.103
1901.0      4.537    0.007     326.203    0.102
1902.0      4.539    0.007     326.219    0.101
1903.0      4.540    0.007     326.234    0.100
1904.0      4.541    0.007     326.249    0.099
1905.0      4.542    0.007     326.265    0.098
1906.0      4.543    0.007     326.280    0.097
1907.0      4.545    0.006     326.295    0.096
1908.0      4.546    0.006     326.311    0.096
1909.0      4.547    0.006     326.326    0.095
1910.0      4.548    0.006     326.341    0.094
1911.0      4.549    0.006     326.356    0.093
1912.0      4.550    0.006     326.372    0.092
1913.0      4.552    0.006     326.387    0.091
1914.0      4.553    0.006     326.402    0.090
1915.0      4.554    0.006     326.417    0.089
1916.0      4.555    0.006     326.432    0.088
1917.0      4.556    0.006     326.448    0.087
1918.0      4.557    0.006     326.463    0.087
1919.0      4.559    0.006     326.478    0.086
1920.0      4.560    0.006     326.493    0.085
1921.0      4.561    0.006     326.508    0.084
1922.0      4.562    0.006     326.524    0.083
1923.0      4.563    0.006     326.539    0.082
1924.0      4.564    0.005     326.554    0.081
1925.0      4.566    0.005     326.569    0.080
1926.0      4.567    0.005     326.584    0.079
1927.0      4.568    0.005     326.599    0.078
1928.0      4.569    0.005     326.614    0.078
1929.0      4.570    0.005     326.629    0.077
1930.0      4.572    0.005     326.645    0.076
1931.0      4.573    0.005     326.660    0.075
1932.0      4.574    0.005     326.675    0.074
1933.0      4.575    0.005     326.690    0.073
1934.0      4.576    0.005     326.705    0.072
1935.0      4.577    0.005     326.720    0.071
1936.0      4.579    0.005     326.735    0.070
1937.0      4.580    0.005     326.750    0.070
1938.0      4.581    0.005     326.765    0.069
1939.0      4.582    0.005     326.780    0.068
1940.0      4.583    0.005     326.795    0.067
1941.0      4.585    0.004     326.810    0.066
1942.0      4.586    0.004     326.825    0.065
1943.0      4.587    0.004     326.840    0.064
1944.0      4.588    0.004     326.855    0.063
1945.0      4.589    0.004     326.870    0.062
1946.0      4.590    0.004     326.885    0.062
1947.0      4.592    0.004     326.900    0.061
1948.0      4.593    0.004     326.915    0.060
1949.0      4.594    0.004     326.930    0.059
1950.0      4.595    0.004     326.945    0.058
1951.0      4.596    0.004     326.960    0.057
1952.0      4.598    0.004     326.975    0.056
1953.0      4.599    0.004     326.990    0.055
1954.0      4.600    0.004     327.005    0.054
1955.0      4.601    0.004     327.020    0.054
1956.0      4.602    0.004     327.035    0.053
1957.0      4.604    0.003     327.049    0.052
1958.0      4.605    0.003     327.064    0.051
1959.0      4.606    0.003     327.079    0.050
1960.0      4.607    0.003     327.094    0.049
1961.0      4.608    0.003     327.109    0.048
1962.0      4.609    0.003     327.124    0.047
1963.0      4.611    0.003     327.139    0.046
1964.0      4.612    0.003     327.153    0.046
1965.0      4.613    0.003     327.168    0.045
1966.0      4.614    0.003     327.183    0.044
1967.0      4.615    0.003     327.198    0.043
1968.0      4.617    0.003     327.213    0.042
1969.0      4.618    0.003     327.228    0.041
1970.0      4.619    0.003     327.242    0.040
1971.0      4.620    0.003     327.257    0.039
1972.0      4.621    0.003     327.272    0.039
1973.0      4.623    0.003     327.287    0.038
1974.0      4.624    0.002     327.301    0.037
1975.0      4.625    0.002     327.316    0.036
1976.0      4.626    0.002     327.331    0.035
1977.0      4.627    0.002     327.346    0.034
1978.0      4.629    0.002     327.360    0.033
1979.0      4.630    0.002     327.375    0.032
1980.0      4.631    0.002     327.390    0.031
1981.0      4.632    0.002     327.405    0.031
1982.0      4.633    0.002     327.419    0.030
1983.0      4.634    0.002     327.434    0.029
1984.0      4.636    0.002     327.449    0.028
1985.0      4.637    0.002     327.463    0.027
1986.0      4.638    0.002     327.478    0.026
1987.0      4.639    0.002     327.493    0.025
1988.0      4.640    0.002     327.507    0.024
1989.0      4.642    0.002     327.522    0.024
1990.0      4.643    0.002     327.537    0.023
1991.0      4.644    0.001     327.551    0.022
1992.0      4.645    0.001     327.566    0.021
1993.0      4.646    0.001     327.581    0.020
1994.0      4.648    0.001     327.595    0.019
1995.0      4.649    0.001     327.610    0.018
1996.0      4.650    0.001     327.624    0.017
1997.0      4.651    0.001     327.639    0.017
1998.0      4.652    0.001     327.654    0.016
1999.0      4.654    0.001     327.668    0.015
2000.0      4.655    0.001     327.683    0.014
2001.0      4.656    0.001     327.697    0.013
2002.0      4.657    0.001     327.712    0.012
2003.0      4.658    0.001     327.726    0.011
2004.0      4.660    0.001     327.741    0.010
2005.0      4.661    0.001     327.755    0.010
2006.0      4.662    0.001     327.770    0.009
2007.0      4.663    0.001     327.784    0.008
2008.0      4.664    0.000     327.799    0.007
2009.0      4.666    0.000     327.813    0.006
2010.0      4.667    0.000     327.828    0.005
2011.0      4.668    0.000     327.842    0.004
2012.0      4.669    0.000     327.857    0.004
2013.0      4.671    0.000     327.871    0.003
2014.0      4.672    0.000     327.886    0.002
2015.0      4.673    0.000     327.900    0.001
2016.0      4.674    0.000     327.915    0.001
2017.0      4.675    0.000     327.929    0.001
2018.0      4.677    0.000     327.944    0.002
2019.0      4.678    0.000     327.958    0.003
2020.0      4.679    0.000     327.972    0.004
2021.0      4.680    0.000     327.987    0.004
2022.0      4.681    0.000     328.001    0.005
2023.0      4.683    0.000     328.016    0.006
2024.0      4.684    0.000     328.030    0.007
2025.0      4.685    0.001     328.044    0.008
2026.0      4.686    0.001     328.059    0.009
2027.0      4.687    0.001     328.073    0.010
2028.0      4.689    0.001     328.087    0.010
2029.0      4.690    0.001     328.102    0.011
2030.0      4.691    0.001     328.116    0.012
2031.0      4.692    0.001     328.131    0.013
2032.0      4.693    0.001     328.145    0.014
2033.0      4.695    0.001     328.159    0.015
2034.0      4.696    0.001     328.173    0.016
2035.0      4.697    0.001     328.188    0.016
2036.0      4.698    0.001     328.202    0.017
2037.0      4.700    0.001     328.216    0.018
2038.0      4.701    0.001     328.231    0.019
2039.0      4.702    0.001     328.245    0.020
2040.0      4.703    0.001     328.259    0.021
2041.0      4.704    0.001     328.273    0.022
2042.0      4.706    0.002     328.288    0.022
2043.0      4.707    0.002     328.302    0.023
2044.0      4.708    0.002     328.316    0.024
2045.0      4.709    0.002     328.330    0.025
2046.0      4.710    0.002     328.345    0.026
2047.0      4.712    0.002     328.359    0.027
2048.0      4.713    0.002     328.373    0.028
2049.0      4.714    0.002     328.387    0.029
2050.0      4.715    0.002     328.401    0.029
2051.0      4.716    0.002     328.416    0.030
2052.0      4.718    0.002     328.430    0.031
2053.0      4.719    0.002     328.444    0.032
2054.0      4.720    0.002     328.458    0.033
2055.0      4.721    0.002     328.472    0.034
2056.0      4.723    0.002     328.487    0.035
2057.0      4.724    0.002     328.501    0.035
2058.0      4.725    0.002     328.515    0.036
2059.0      4.726    0.003     328.529    0.037
2060.0      4.727    0.003     328.543    0.038
2061.0      4.729    0.003     328.557    0.039
2062.0      4.730    0.003     328.571    0.040
2063.0      4.731    0.003     328.585    0.040
2064.0      4.732    0.003     328.599    0.041
2065.0      4.734    0.003     328.614    0.042
2066.0      4.735    0.003     328.628    0.043
2067.0      4.736    0.003     328.642    0.044
2068.0      4.737    0.003     328.656    0.045
2069.0      4.738    0.003     328.670    0.046
2070.0      4.740    0.003     328.684    0.046
2071.0      4.741    0.003     328.698    0.047
2072.0      4.742    0.003     328.712    0.048
2073.0      4.743    0.003     328.726    0.049
2074.0      4.745    0.003     328.740    0.050
2075.0      4.746    0.003     328.754    0.051
2076.0      4.747    0.003     328.768    0.052
2077.0      4.748    0.004     328.782    0.052
2078.0      4.749    0.004     328.796    0.053
2079.0      4.751    0.004     328.810    0.054
2080.0      4.752    0.004     328.824    0.055
2081.0      4.753    0.004     328.838    0.056
2082.0      4.754    0.004     328.852    0.057
2083.0      4.756    0.004     328.866    0.058
2084.0      4.757    0.004     328.880    0.058
2085.0      4.758    0.004     328.894    0.059
2086.0      4.759    0.004     328.908    0.060
2087.0      4.760    0.004     328.922    0.061
2088.0      4.762    0.004     328.936    0.062
2089.0      4.763    0.004     328.949    0.063
2090.0      4.764    0.004     328.963    0.063
2091.0      4.765    0.004     328.977    0.064
2092.0      4.767    0.004     328.991    0.065
2093.0      4.768    0.004     329.005    0.066
2094.0      4.769    0.005     329.019    0.067
2095.0      4.770    0.005     329.033    0.068
2096.0      4.772    0.005     329.047    0.069
2097.0      4.773    0.005     329.061    0.069
2098.0      4.774    0.005     329.074    0.070
2099.0      4.775    0.005     329.088    0.071
2100.0      4.776    0.005     329.102    0.072


WDS record for STT 72 AB
wds_id                       : 04080+1720
discoverer_code              : STT
discoverer_number            : 72
discoverer_components        : AB
date_first                   : 1854
date_last                    : 2019
num_of_obs                   : 46
pa_first                     : 324
pa_last                      : 327
sep_first                    : 4.5
sep_last                     : 4.8
mag_primary                  : 6.1
mag_secondary                : 9.71
spectral_type                : K5IIIb
primary_proper_motion_RA     : 8
primary_proper_motion_DEC    : -12
secondary_proper_motion_RA   : 8
secondary_proper_motion_DEC  : -10
dm_number                    : +16  560
notes                        : 
precise_coordinate           : 040759.42+172023.6



Parsed GAIA Input Data
Click to expand/collapse the Gaia Input Data:
Star A
solution_id = 1636148068921376768
designation = Gaia DR3 46741446184164224
source_id = 46741446184164224
random_index = 1196160123.0
ref_epoch = 2016.0
ra = 61.997611440273474
ra_error = 0.054442372
dec = 17.339854178818506
dec_error = 0.030893479
parallax = 7.251763115678877
parallax_error = 0.056115024
parallax_over_error = 129.23033
pm = 13.193873
pmra = 8.799899885770698
pmra_error = 0.07728895
pmdec = -9.830567763689917
pmdec_error = 0.04672007
ra_dec_corr = -0.070475325
ra_parallax_corr = -0.23701589
ra_pmra_corr = -0.05831526
ra_pmdec_corr = 0.0073002293
dec_parallax_corr = -0.108591564
dec_pmra_corr = -0.05222315
dec_pmdec_corr = 0.39738935
parallax_pmra_corr = 0.1917241
parallax_pmdec_corr = -0.037834138
pmra_pmdec_corr = -0.17236638
astrometric_n_obs_al = 212
astrometric_n_obs_ac = 212
astrometric_n_good_obs_al = 205
astrometric_n_bad_obs_al = 7
astrometric_gof_al = 0.8066009
astrometric_chi2_al = 3611.5176
astrometric_excess_noise = 0.3380333
astrometric_excess_noise_sig = 139.35744
astrometric_params_solved = 31
astrometric_primary_flag = false
nu_eff_used_in_astrometry = 1.376795
astrometric_matched_transits = 24
visibility_periods_used = 13
astrometric_sigma5d_max = 0.108116016
matched_transits = 27
new_matched_transits = 6
matched_transits_removed = 9
ipd_gof_harmonic_amplitude = 0.055864368
ipd_gof_harmonic_phase = 96.487144
ipd_frac_multi_peak = 0
ipd_frac_odd_win = 0
ruwe = 1.0389115
duplicated_source = false
phot_g_n_obs = 218
phot_g_mean_flux = 139230513.53208274
phot_g_mean_flux_error = 81959.67
phot_g_mean_flux_over_error = 1698.7686
phot_g_mean_mag = 5.3280306
phot_bp_n_obs = 25
phot_bp_mean_flux = 45624101.27190967
phot_bp_mean_flux_error = 58108.207
phot_bp_mean_flux_over_error = 785.1576
phot_bp_mean_mag = 6.1905565
phot_rp_n_obs = 24
phot_rp_mean_flux = 135420715.72226337
phot_rp_mean_flux_error = 231237.14
phot_rp_mean_flux_over_error = 585.6357
phot_rp_mean_mag = 4.4186826
phot_bp_rp_excess_factor = 1.3003243
phot_bp_n_contaminated_transits = 0
phot_bp_n_blended_transits = 0
phot_rp_n_contaminated_transits = 0
phot_rp_n_blended_transits = 0
phot_proc_mode = 0
bp_rp = 1.771874
bp_g = 0.86252594
g_rp = 0.909348
radial_velocity = -31.843117
radial_velocity_error = 0.12794791
rv_method_used = 1
rv_nb_transits = 13
rv_nb_deblended_transits = 0
rv_visibility_periods_used = 11
rv_expected_sig_to_noise = 1185.3912
rv_chisq_pvalue = 0.8221685
rv_time_duration = 888.0801
rv_amplitude_robust = 0.52796745
rv_template_teff = 4500.0
rv_template_logg = 0.0
rv_template_fe_h = -0.75
rv_atm_param_origin = 111
grvs_mag = 4.064401
grvs_mag_error = 0.0054907934
grvs_mag_nb_transits = 13
phot_variable_flag = NOT_AVAILABLE
l = 175.62887239365338
b = -24.8283416463385
ecl_lon = 63.318591860907176
ecl_lat = -3.5432515701951672
in_qso_candidates = false
in_galaxy_candidates = false
non_single_star = 0
has_xp_continuous = false
has_xp_sampled = false
has_rvs = false
has_epoch_photometry = false
has_epoch_rv = false
has_mcmc_gspphot = false
has_mcmc_msc = false
in_andromeda_survey = false
classprob_dsc_combmod_quasar = 1.0225226e-13
classprob_dsc_combmod_galaxy = 5.1074493e-13
classprob_dsc_combmod_star = 0.99997723
    Star B
solution_id = 1636148068921376768
designation = Gaia DR3 46741652342594304
source_id = 46741652342594304
random_index = 710903924.0
ref_epoch = 2016.0
ra = 61.99688893320026
ra_error = 0.019441329
dec = 17.340954228803994
dec_error = 0.010451087
parallax = 7.33025863395238
parallax_error = 0.019019775
parallax_over_error = 385.40195
pm = 12.28117
pmra = 9.157708841383831
pmra_error = 0.026009398
pmdec = -8.183123617043764
pmdec_error = 0.015362929
ra_dec_corr = -0.06114633
ra_parallax_corr = -0.2916283
ra_pmra_corr = -0.28101113
ra_pmdec_corr = 0.08382243
dec_parallax_corr = -0.21954542
dec_pmra_corr = 0.008723742
dec_pmdec_corr = 0.25699797
parallax_pmra_corr = 0.05824703
parallax_pmdec_corr = -0.08199001
pmra_pmdec_corr = -0.21415608
astrometric_n_obs_al = 238
astrometric_n_obs_ac = 238
astrometric_n_good_obs_al = 234
astrometric_n_bad_obs_al = 4
astrometric_gof_al = -1.7364
astrometric_chi2_al = 396.82837
astrometric_excess_noise = 0.076689675
astrometric_excess_noise_sig = 5.996783
astrometric_params_solved = 31
astrometric_primary_flag = false
nu_eff_used_in_astrometry = 1.5350341
astrometric_matched_transits = 27
visibility_periods_used = 13
astrometric_sigma5d_max = 0.036942348
matched_transits = 32
new_matched_transits = 10
matched_transits_removed = 0
ipd_gof_harmonic_amplitude = 0.054678146
ipd_gof_harmonic_phase = 97.93227
ipd_frac_multi_peak = 0
ipd_frac_odd_win = 0
ruwe = 0.9185553
duplicated_source = false
phot_g_n_obs = 252
phot_g_mean_flux = 2283175.6280700173
phot_g_mean_flux_error = 1622.1814
phot_g_mean_flux_over_error = 1407.4724
phot_g_mean_mag = 9.7910185
phot_bp_n_obs = 11
phot_bp_mean_flux = 1254300.3151834644
phot_bp_mean_flux_error = 5004.357
phot_bp_mean_flux_over_error = 250.64166
phot_bp_mean_mag = 10.092539
phot_rp_n_obs = 13
phot_rp_mean_flux = 1828988.7389792616
phot_rp_mean_flux_error = 59720.816
phot_rp_mean_flux_over_error = 30.625648
phot_rp_mean_mag = 9.092368
phot_bp_rp_excess_factor = 1.3504388
phot_bp_n_contaminated_transits = 2
phot_bp_n_blended_transits = 0
phot_rp_n_contaminated_transits = 6
phot_rp_n_blended_transits = 1
phot_proc_mode = 0
bp_rp = 1.0001707
bp_g = 0.30152035
g_rp = 0.69865036
phot_variable_flag = NOT_AVAILABLE
l = 175.6274637233189
b = -24.828115208586084
ecl_lon = 63.31811931026069
ecl_lat = -3.5420418996481886
in_qso_candidates = false
in_galaxy_candidates = false
non_single_star = 0
has_xp_continuous = false
has_xp_sampled = false
has_rvs = false
has_epoch_photometry = false
has_epoch_rv = false
has_mcmc_gspphot = false
has_mcmc_msc = false
in_andromeda_survey = false
classprob_dsc_combmod_quasar = 7.2546746e-11
classprob_dsc_combmod_galaxy = 5.1414526e-13
classprob_dsc_combmod_star = 0.99991024




Observation Date:


Disclaimer
This result is provided without warranty. For all terms, see the Full Disclaimer. Copyright (C) 2025. Unless otherwise noted, all output generated by the Double Star Calculator including orbit diagrams, ephemerides, and analytical reports is licensed under CC BY 4.0.


Acknowledgements
The Double Star Calculator makes use of data from the European Space Agency (ESA) mission Gaia, processed by the Gaia Data Processing and Analysis Consortium (DPAC). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. Additionally, it incorporates data from the Washington Double Star Catalog, maintained at the U.S. Naval Observatory, and makes use of the Aladin Sky Atlas developed at CDS, Strasbourg Observatory, France.


Report Information
Double Star Calculator: Version 1.0 ($Rev: 1734 $)
Report created: 2025-12-29 22:42:41 +0100



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