05487-1419 HDS 781 (HD 38931)
05h 48m 39.68s -14° 18' 51.7" P.A. 81.00 sep 0.2 mag 7.16,8.55 Sp G6/G8III/ dist. 145.35 pc (474.13 l.y.)
| Coord 2000 |
05487-1419 |
|
Discov num |
HDS 781 |
|
Comp |
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Coord arcsec 2000 |
05 48 39.68 -14 18 51.7 |
|
| Date first |
1991 |
|
Date last |
2020 |
|
Obs |
9 |
|
| Pa first |
295 |
|
Pa last |
81.4 |
|
P.A. Now (θ) |
81.4° |
|
| Sep first |
0.1 |
|
Sep last |
0.205 |
|
Sep. Now (ρ) |
0.205" |
|
| Mag pri |
7.16 |
|
Mag sec |
8.55 |
|
delta mag (ΔM) |
1.39 |
|
Spectral class |
G6/G8III/ (yellow) |
|
| Pri motion ra |
-008 |
|
Sec motion ra |
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| Pri motion dec |
-001 |
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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 38931 |
|
Constellation |
Lepus |
|
SAO |
150830 |
|
HIP |
27444 |
|
| Tycho2 |
5359-01666-1 |
|
Gaia DR2 |
2996587794679897216 |
|
HD |
38931 |
|
GC |
7296 |
|
| BD |
BD-14 1243 |
|
Distance |
145.35 |
|
Distance ly |
474.13 |
|
ORBITAL ELEMENTS
| Period (P) | 105y | |
Periastron (T) | 1991.94y | |
Semi-major axis (a) | 0.195a | |
| Eccentricity (e) | 0.277 | |
Inclination (i) | 46.9° | |
Longitude of periastron (ω) | 205.8° | |
| Node (Ω) | 100.1° | |
Notes | | |
Reference | Tok2021c | |
| Equinox | 2000 | |
Last observation | 2021 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
347.4 |
0.108 |
| 2001 |
354.7 |
0.108 |
| 2002 |
2.1 |
0.108 |
| 2003 |
9.3 |
0.110 |
| 2004 |
16.3 |
0.112 |
| 2005 |
23.0 |
0.115 |
| 2006 |
29.2 |
0.120 |
| 2007 |
34.9 |
0.124 |
| 2008 |
40.3 |
0.130 |
| 2009 |
45.1 |
0.135 |
| 2010 |
49.6 |
0.141 |
| 2011 |
53.7 |
0.148 |
| 2012 |
57.5 |
0.154 |
| 2013 |
61.0 |
0.160 |
| 2014 |
64.2 |
0.166 |
| 2015 |
67.2 |
0.173 |
| 2016 |
69.9 |
0.179 |
| 2017 |
72.5 |
0.184 |
| 2018 |
75.0 |
0.190 |
| 2019 |
77.3 |
0.195 |
| 2020 |
79.5 |
0.201 |
| 2021 |
81.5 |
0.206 |
| 2022 |
83.5 |
0.210 |
| 2023 |
85.4 |
0.214 |
| 2024 |
87.2 |
0.218 |
| 2025 |
89.0 |
0.222 |
| 2026 |
90.7 |
0.226 |
| 2027 |
92.4 |
0.229 |
| 2028 |
94.0 |
0.232 |
| 2029 |
95.6 |
0.234 |
| 2030 |
97.1 |
0.236 |
|
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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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