21069+3845 STF 2758 AB (61 Cyg)

 
 
21h 06m 53.95s +38 44' 57.9" P.A. 154.00 sep 32.0 mag 5.35,6.10 Sp K5V+K7V dist. 3.49 pc (11.38 l.y.)
 
 
Coord 2000 21069+3845 Discov num STF2758 Comp AB Coord arcsec 2000 21 06 53.95 +38 44 57.9
Date first 1753 Date last 2022 Obs 1809
Pa first 35 Pa last 153.5 P.A. Now (θ) 153.5°
Sep first 19.6 Sep last 31.99 Sep. Now (ρ) 31.99"
Mag pri 5.35 Mag sec 6.10 delta mag (ΔM) 0.75 Spectral class K5V+K7V (yellow-orange/yellow-orange)
Pri motion ra +417 Sec motion ra +412
Pri motion dec +326 Sec motion dec +313
Notes N O P (See Notes, Orbital solution, 100-year proper motion)
rPM=0.026 (< 0.3, Physical double)
This double is physical.
 
 
21069+3845 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show 61 Cyg 70919 21 06 54 +38 44 58 STF 2758 AB 2022 1809 154 32.0 5.35 6.10 0.75 Y <===
Show 21 06 54 +38 44 58 STF 2758 AC 2016 7 219 839.8 5.35 10.23 4.88
Show 70919 21 06 54 +38 44 58 STF 2758 AD 2016 5 250 748.0 5.35 10.45 5.10
Show 70919 21 06 54 +38 44 58 STF 2758 AE 2016 13 267 340.8 5.35 9.63 4.28
Show 21 06 54 +38 44 58 STF 2758 AF 2016 11 240 371.2 5.35 11.30 5.95
Show 21 06 54 +38 44 58 STF 2758 AG 2016 14 236 260.4 5.35 11.30 5.95
Show 21 06 54 +38 44 58 STF 2758 AH 2021 34 263 134.0 5.35 9.97 4.62
Show 21 06 54 +38 44 58 SMR 1 AI 2021 16 236 49.3 5.35 10.74 5.39
Show 21 06 54 +38 44 58 HZE 4 AJ 2015 4 241 17.5 5.35
Show 21 06 54 +38 44 58 HZE 4 AK 2006 1 83 7.8 5.35
Show 21 06 54 +38 44 58 SMR 40 AO 2021 12 275 176.6 5.35 12.65 7.30
Show 21 06 54 +38 44 58 SMR 40 AP 2021 11 284 166.5 5.35 12.84 7.49
Show 21 06 54 +38 44 58 SMR 40 AQ 2021 7 295 76.1 5.35 13.19 7.84
Show 21 06 55 +38 44 32 STF 2758 BC 2016 7 221 827.6 6.10 10.03 3.93
Show 21 06 55 +38 44 32 HZE 4 BL 2006 1 145 9.9 6.10
Show 21 06 55 +38 44 32 FYM 106 BM 2016 4 238 100.7 6.10 14.30 8.20
Show 21 06 55 +38 44 32 FYM 106 BN 2016 4 152 48.3 6.05 14.40 8.35
Show 21 06 55 +38 44 32 TNN 15 BR 2005 1 77 11.5 6.10
18-fold system
18 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name 61 Cyg Var name V1803 Cyg Constellation Cygnus SAO 70919
HIP 104214 Tycho2 3168-02800-1 Gaia DR2 1872047227813442688 HD 201091
HR 8085 GC 29509 ADS 14636 GL Gl 820A
BD BD+38 4343 Flamsteed 61 Cygni Flamsteed name 61 Cyg FK5 793
Distance 3.49 Distance ly 11.38
 
 
ORBITAL ELEMENTS
 
 
Period (P)704.858y± 40.221 Periastron (T)1696.004y± 6.742 Semi-major axis (a)24.57a± 3.5
Eccentricity (e)0.435± 0.044 Inclination (i)52.018°± 0.443 Longitude of periastron (ω)154.044°± 6.821
Node (Ω)174.56°± 2.514 Notesn ReferencePkO2021b
Equinox Last observation2019 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 149.8 30.638
2001 150.0 30.703
2002 150.1 30.767
2003 150.3 30.830
2004 150.5 30.893
2005 150.7 30.956
2006 150.9 31.017
2007 151.0 31.079
2008 151.2 31.139
2009 151.4 31.199
2010 151.6 31.259
2011 151.7 31.318
2012 151.9 31.376
2013 152.1 31.434
2014 152.3 31.491
2015 152.4 31.548
2016 152.6 31.604
2017 152.8 31.659
2018 152.9 31.714
2019 153.1 31.768
2020 153.3 31.822
2021 153.5 31.875
2022 153.6 31.928
2023 153.8 31.979
2024 154.0 32.031
2025 154.1 32.081
2026 154.3 32.132
2027 154.4 32.181
2028 154.6 32.230
2029 154.8 32.278
2030 154.9 32.326


 
grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.



 
 


wds21069%2B3845g.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
 
SUSPECTED ORBITAL ELEMENTS
 
 
Identifier21069+3845 STF2758 A
coord_arcsec_2000210653.94+384457.8
Period (P)4.9y Periastron (T)1953.2y Semi-major axis (a)0.14a
Eccentricity (e)0.5 Inclination (i)134° Longitude of periastron (ω)295°
Node (Ω)94° Notesn ReferenceDej1960
Equinox Last observation1958 Grade9(1=Definitive, 9=Indet.)
label theta rho
2000 321.9 0.165
2001 291.3 0.161
2002 214.3 0.058
2003 51.6 0.112
2004 355.5 0.139
2005 318.8 0.167
2006 287.8 0.157
2007 183.9 0.050
2008 44.9 0.115
2009 351.1 0.142
2010 315.7 0.169
2011 284.2 0.151
2012 150.1 0.053
2013 38.4 0.117
2014 346.9 0.146
2015 312.7 0.170
2016 280.3 0.145
2017 124.3 0.064
2018 32.3 0.119
2019 342.9 0.149
2020 309.7 0.170
2021 275.9 0.137
2022 106.6 0.076
2023 26.3 0.122
2024 339.1 0.152
2025 306.7 0.171
2026 270.9 0.127
2027 93.7 0.087
2028 20.6 0.124
2029 335.4 0.155
2030 303.7 0.170


 
grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.



 
 


wds21069%2B3845r.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic