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Doubles in session


Current system
21176+8231
STF 2807
HD 204372


Nearby doubles
22' : 21170+8210
LOC 482

22' : 21164+8210
LDS1949

45' : 21370+8255
STF2837

45' : 21354+8300
LDS1956

48' : 21239+8317
HDS3049

49' : 21196+8143
AZC 180

53' : 21322+8316
TDT3014

59' : 21147+8133
LOC 478

62' : 21060+8134
LOC 480

67' : 21236+8337
LOC 491

72' : 21118+8121
LOC 571AB

75' : 21060+8121
PKO 31

78' : 21157+8114
MLR 245

87' : 21105+8356
LOC 481

103' : 21210+8413
MLR 247

107' : 21066+8048
TOK 632

107' : 21235+8417
SKF 397AB

124' : 21070+8030
LOC 479

126' : 21211+8436
MLR 248

130' : 21185+8021
STF2801

151' : 21152+8501
LOC 483

151' : 21357+8459
LOC 492

167' : 21223+7945
MLR 246

175' : 21249+7938
LOC 489

197' : 21010+7919
MLR 244

210' : 21217+7902
UC 4456



Selections
Full WDS
Binocular doubles
Binary Systems
Triple Systems
Quadruple Systems
Multiple Systems
Neglected List I
Neglected List II
Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

21176+8231 STF 2807 (HD 204372)

 
 
21h 17m 33.47s +82° 31' 03.7" P.A. 310.00 sep 1.8 mag 8.65,8.77 Sp F8 dist. 75.02 pc (244.72 l.y.)
 
 
Coord 2000 21176+8231 Discov num STF2807 Comp Coord arcsec 2000 21 17 33.47 +82 31 03.7
Date first 1829 Date last 2023 Obs 47
Pa first 315 Pa last 309.9 P.A. Now (θ) 309.5°
Sep first 1.9 Sep last 1.81 Sep. Now (ρ) 1.785"
Mag pri 8.65 Mag sec 8.77 delta mag (ΔM) 0.12 Spectral class F8 (yellow-white)
Pri motion ra +012 Sec motion ra +012
Pri motion dec +082 Sec motion dec +082
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 204372 Constellation Cepheus SAO 3550 HIP 105112
Tycho2 4649-00045-1 Gaia DR2 2298698382656425216 HD 204372 GC 29930
ADS 14921 BD BD+81 737 Distance 75.02 Distance ly 244.72
 
 
ORBITAL ELEMENTS
 
 
Period (P)2818.9854y± 1456.9941 Periastron (T)1641.0222y± 501.3932 Semi-major axis (a)6.15221a± 4.16702
Eccentricity (e)0.80384± 0.1589 Inclination (i)91.733°± 3.879 Longitude of periastron (ω)108.438°± 25.004
Node (Ω)136.406°± 5.633 Notes ReferenceIzm2019
Equinox Last observation2015 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 310.7 1.851
2001 310.7 1.847
2002 310.7 1.842
2003 310.7 1.838
2004 310.6 1.833
2005 310.6 1.829
2006 310.6 1.825
2007 310.6 1.820
2008 310.5 1.816
2009 310.5 1.811
2010 310.5 1.807
2011 310.5 1.802
2012 310.4 1.798
2013 310.4 1.793
2014 310.4 1.789
2015 310.3 1.784
2016 310.3 1.780
2017 310.3 1.775
2018 310.3 1.770
2019 310.2 1.766
2020 310.2 1.761
2021 310.2 1.757
2022 310.2 1.752
2023 310.1 1.748
2024 310.1 1.743
2025 310.1 1.738
2026 310.0 1.734
2027 310.0 1.729
2028 310.0 1.725
2029 310.0 1.720
2030 309.9 1.715
2031 309.9 1.711
2032 309.9 1.706
2033 309.8 1.702
2034 309.8 1.697
2035 309.8 1.692
2036 309.7 1.688
2037 309.7 1.683
2038 309.7 1.678
2039 309.7 1.674
2040 309.6 1.669
2041 309.6 1.664
2042 309.6 1.659
2043 309.5 1.655
2044 309.5 1.650
2045 309.5 1.645
2046 309.4 1.641
2047 309.4 1.636
2048 309.4 1.631
2049 309.3 1.626
2050 309.3 1.622


 
 grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
wds21176%2B8231a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic