00258+1025 HDS 57 (HD 2157)
00h 25m 49.78s +10° 25' 24.1" P.A. 340.00 sep 0.1 mag 9.71,10.71 Sp G0 dist. 110.13 pc (359.24 l.y.)
| Coord 2000 |
00258+1025 |
|
Discov num |
HDS 57 |
|
Comp |
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Coord arcsec 2000 |
00 25 49.78 +10 25 24.1 |
|
| Date first |
1991 |
|
Date last |
2021 |
|
Obs |
14 |
|
| Pa first |
157 |
|
Pa last |
339.9 |
|
P.A. Now (θ) |
339.9° |
|
| Sep first |
0.2 |
|
Sep last |
0.056 |
|
Sep. Now (ρ) |
0.056" |
|
| Mag pri |
9.71 |
|
Mag sec |
10.71 |
|
delta mag (ΔM) |
1 |
|
Spectral class |
G0 (yellow) |
|
| Pri motion ra |
+066 |
|
Sec motion ra |
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|
| Pri motion dec |
+049 |
|
Sec motion dec |
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| Notes |
O
(Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 2157 |
|
Constellation |
Pisces |
|
SAO |
91889 |
|
HIP |
2035 |
|
| Tycho2 |
0599-00603-1 |
|
Gaia DR2 |
2754101912605043584 |
|
HD |
2157 |
|
BD |
BD+09 41 |
|
| Distance |
110.13 |
|
Distance ly |
359.24 |
|
ORBITAL ELEMENTS
| Period (P) | 96.7y | |
Periastron (T) | 2019.26y | |
Semi-major axis (a) | 0.179a | |
| Eccentricity (e) | 0.527 | |
Inclination (i) | 131.8° | |
Longitude of periastron (ω) | 47.4° | |
| Node (Ω) | 52.9° | |
Notes | | |
Reference | Tok2021c | |
| Equinox | 2000 | |
Last observation | 2021 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
133.3 |
0.133 |
| 2001 |
129.4 |
0.130 |
| 2002 |
125.3 |
0.127 |
| 2003 |
121.0 |
0.125 |
| 2004 |
116.6 |
0.123 |
| 2005 |
112.1 |
0.121 |
| 2006 |
107.4 |
0.119 |
| 2007 |
102.5 |
0.117 |
| 2008 |
97.6 |
0.116 |
| 2009 |
92.5 |
0.114 |
| 2010 |
87.2 |
0.113 |
| 2011 |
81.8 |
0.111 |
| 2012 |
76.2 |
0.109 |
| 2013 |
70.3 |
0.106 |
| 2014 |
64.1 |
0.103 |
| 2015 |
57.4 |
0.098 |
| 2016 |
50.0 |
0.093 |
| 2017 |
41.7 |
0.087 |
| 2018 |
32.0 |
0.080 |
| 2019 |
20.4 |
0.073 |
| 2020 |
6.2 |
0.066 |
| 2021 |
349.5 |
0.062 |
| 2022 |
331.4 |
0.061 |
| 2023 |
314.0 |
0.064 |
| 2024 |
299.1 |
0.071 |
| 2025 |
287.2 |
0.080 |
| 2026 |
277.8 |
0.090 |
| 2027 |
270.4 |
0.101 |
| 2028 |
264.4 |
0.112 |
| 2029 |
259.4 |
0.122 |
| 2030 |
255.3 |
0.132 |
|
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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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