21379+2102 YR 30 (HD 205897)
21h 37m 56.03s +21° 02' 28.3" P.A. 340.00 sep 0.1 mag 8.90,9.00 Sp G5 dist. 112.11 pc (365.7 l.y.)
| Coord 2000 |
21379+2102 |
|
Discov num |
YR 30 |
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Comp |
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Coord arcsec 2000 |
21 37 56.03 +21 02 28.3 |
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| Date first |
2000 |
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Date last |
2021 |
|
Obs |
15 |
|
| Pa first |
334 |
|
Pa last |
339.6 |
|
P.A. Now (θ) |
344.7° |
|
| Sep first |
0.1 |
|
Sep last |
0.148 |
|
Sep. Now (ρ) |
0.145" |
|
| Mag pri |
8.90 |
|
Mag sec |
9.00 |
|
delta mag (ΔM) |
0.1 |
|
Spectral class |
G5 (yellow) |
|
| Pri motion ra |
+053 |
|
Sec motion ra |
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| Pri motion dec |
+081 |
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Sec motion dec |
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| Notes |
O
(Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 205897 |
|
Constellation |
Pegasus |
|
SAO |
89858 |
|
HIP |
106804 |
|
| Tycho2 |
1677-00210-1 |
|
Gaia DR2 |
1787577143922361984 |
|
HD |
205897 |
|
BD |
BD+20 4977 |
|
| Distance |
112.11 |
|
Distance ly |
365.7 |
|
ORBITAL ELEMENTS
| Period (P) | 18.472y | ± 0.396 |
Periastron (T) | 2011.139y | ± 0.31 |
Semi-major axis (a) | 0.087a | ± 0.0078 |
| Eccentricity (e) | 0.771 | ± 0.279 |
Inclination (i) | 43.7° | ± 12 |
Longitude of periastron (ω) | 343.2° | ± 23.1 |
| Node (Ω) | 169° | ± 18.6 |
Notes | | |
Reference | Cve2017b | |
| Equinox | 2000 | |
Last observation | 2015 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
330.8 |
0.143 |
| 2001 |
334.0 |
0.149 |
| 2002 |
337.0 |
0.151 |
| 2003 |
339.9 |
0.151 |
| 2004 |
343.0 |
0.148 |
| 2005 |
346.2 |
0.142 |
| 2006 |
349.8 |
0.132 |
| 2007 |
354.1 |
0.119 |
| 2008 |
359.6 |
0.102 |
| 2009 |
8.1 |
0.078 |
| 2010 |
26.1 |
0.047 |
| 2011 |
130.0 |
0.018 |
| 2012 |
258.2 |
0.033 |
| 2013 |
293.7 |
0.059 |
| 2014 |
307.5 |
0.083 |
| 2015 |
315.5 |
0.102 |
| 2016 |
321.1 |
0.118 |
| 2017 |
325.5 |
0.130 |
| 2018 |
329.2 |
0.140 |
| 2019 |
332.5 |
0.146 |
| 2020 |
335.6 |
0.150 |
| 2021 |
338.5 |
0.151 |
| 2022 |
341.5 |
0.150 |
| 2023 |
344.7 |
0.145 |
| 2024 |
348.0 |
0.137 |
| 2025 |
352.0 |
0.126 |
| 2026 |
356.8 |
0.111 |
| 2027 |
3.5 |
0.090 |
| 2028 |
15.3 |
0.063 |
| 2029 |
54.0 |
0.027 |
| 2030 |
214.5 |
0.023 |
|
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Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
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Measures: green=micrometric, blue=interferometric, purple=photographic |
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