04571-1338 A 2625 (HD 31656)
04h 57m 04.79s -13° 38' 02.6" P.A. 182.00 sep 0.1 mag 9.90,9.90 Sp F2V
Coord 2000 |
04571-1338 |
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Discov num |
A 2625 |
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Comp |
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Coord arcsec 2000 |
04 57 04.79 -13 38 02.6 |
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Date first |
1913 |
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Date last |
2021 |
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Obs |
12 |
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Pa first |
359 |
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Pa last |
181.6 |
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P.A. Now (θ) |
198.4° |
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Sep first |
0.3 |
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Sep last |
0.057 |
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Sep. Now (ρ) |
0.047" |
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Mag pri |
9.90 |
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Mag sec |
9.90 |
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delta mag (ΔM) |
0 |
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Spectral class |
F2V (yellow-white) |
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Pri motion ra |
-002 |
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Sec motion ra |
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Pri motion dec |
-028 |
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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 31656 |
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Constellation |
Eridanus |
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SAO |
150016 |
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Tycho2 |
5329-00117-1 |
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Gaia DR2 |
2987535790325735168 |
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HD |
31656 |
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ADS |
3559 |
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ORBITAL ELEMENTS
Period (P) | 178.2y | ± 42.5 |
Periastron (T) | 2022.16y | ± 1.02 |
Semi-major axis (a) | 0.177a | ± 0.014 |
Eccentricity (e) | 0.664 | ± 0.029 |
Inclination (i) | 51° | ± 7.8 |
Longitude of periastron (ω) | 42.5° | ± 5.4 |
Node (Ω) | 157.8° | ± 14 |
Notes | | |
Reference | Tok2021c | |
Equinox | 2000 | |
Last observation | 2021 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
78.5 |
0.103 |
2001 |
81.4 |
0.101 |
2002 |
84.4 |
0.098 |
2003 |
87.5 |
0.096 |
2004 |
90.8 |
0.094 |
2005 |
94.2 |
0.092 |
2006 |
97.8 |
0.091 |
2007 |
101.5 |
0.089 |
2008 |
105.3 |
0.087 |
2009 |
109.3 |
0.086 |
2010 |
113.4 |
0.084 |
2011 |
117.6 |
0.083 |
2012 |
122.0 |
0.082 |
2013 |
126.6 |
0.080 |
2014 |
131.3 |
0.078 |
2015 |
136.3 |
0.077 |
2016 |
141.5 |
0.075 |
2017 |
147.1 |
0.072 |
2018 |
153.0 |
0.069 |
2019 |
159.6 |
0.065 |
2020 |
167.1 |
0.061 |
2021 |
175.7 |
0.056 |
2022 |
185.9 |
0.051 |
2023 |
198.4 |
0.047 |
2024 |
213.2 |
0.043 |
2025 |
229.9 |
0.042 |
2026 |
246.7 |
0.043 |
2027 |
261.9 |
0.046 |
2028 |
274.3 |
0.052 |
2029 |
284.2 |
0.058 |
2030 |
291.9 |
0.066 |
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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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