21400-5222 HDS 3084 (HD 205877)
21h 39m 59.74s -52° 21' 32.5" P.A. 106.00 sep 0.0 mag 6.88,7.30 Sp F7III dist. 173.91 pc (567.29 l.y.)
| Coord 2000 |
21400-5222 |
|
Discov num |
HDS3084 |
|
Comp |
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|
Coord arcsec 2000 |
21 39 59.74 -52 21 32.5 |
|
| Date first |
1991 |
|
Date last |
2021 |
|
Obs |
16 |
|
| Pa first |
321 |
|
Pa last |
106 |
|
P.A. Now (θ) |
61° |
|
| Sep first |
0.1 |
|
Sep last |
0.04 |
|
Sep. Now (ρ) |
0.055" |
|
| Mag pri |
6.88 |
|
Mag sec |
7.30 |
|
delta mag (ΔM) |
0.42 |
|
Spectral class |
F7III (yellow-white) |
|
| Pri motion ra |
-019 |
|
Sec motion ra |
|
|
| Pri motion dec |
+007 |
|
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 205877 |
|
Constellation |
Indus |
|
SAO |
247128 |
|
HIP |
106978 |
|
| Tycho2 |
8436-00887-1 |
|
Gaia DR2 |
6462505250113259008 |
|
HD |
205877 |
|
HR |
8269 |
|
| GC |
30304 |
|
CP |
CP-5211911 |
|
FK5 |
3726 |
|
Distance |
173.91 |
|
| Distance ly |
567.29 |
|
ORBITAL ELEMENTS
| Period (P) | 21.32y | ± 0.56 |
Periastron (T) | 1999.13y | ± 0.62 |
Semi-major axis (a) | 0.076a | ± 0.001 |
| Eccentricity (e) | 0.461 | ± 0.007 |
Inclination (i) | 149.4° | ± 3.2 |
Longitude of periastron (ω) | 16.6° | ± 4.9 |
| Node (Ω) | 176.2° | ± 4.7 |
Notes | | |
Reference | Tok2021f | |
| Equinox | 2000 | |
Last observation | 2021 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
121.2 |
0.040 |
| 2001 |
80.6 |
0.047 |
| 2002 |
53.8 |
0.059 |
| 2003 |
36.3 |
0.072 |
| 2004 |
24.0 |
0.083 |
| 2005 |
14.4 |
0.093 |
| 2006 |
6.4 |
0.100 |
| 2007 |
359.4 |
0.105 |
| 2008 |
352.9 |
0.109 |
| 2009 |
346.7 |
0.110 |
| 2010 |
340.5 |
0.110 |
| 2011 |
334.2 |
0.107 |
| 2012 |
327.5 |
0.103 |
| 2013 |
320.2 |
0.098 |
| 2014 |
311.8 |
0.091 |
| 2015 |
301.8 |
0.082 |
| 2016 |
289.4 |
0.073 |
| 2017 |
273.1 |
0.063 |
| 2018 |
250.7 |
0.053 |
| 2019 |
220.2 |
0.046 |
| 2020 |
181.6 |
0.042 |
| 2021 |
136.2 |
0.040 |
| 2022 |
92.1 |
0.044 |
| 2023 |
61.0 |
0.055 |
| 2024 |
41.2 |
0.068 |
| 2025 |
27.6 |
0.080 |
| 2026 |
17.2 |
0.090 |
| 2027 |
8.8 |
0.098 |
| 2028 |
1.5 |
0.104 |
| 2029 |
354.9 |
0.108 |
| 2030 |
348.6 |
0.110 |
|
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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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