04089+4614 A 998 (HD 25987)
04h 08m 54.55s +46° 13' 40.2" P.A. 180.00 sep 0.2 mag 7.87,8.50 Sp A0V dist. 145.77 pc (475.5 l.y.)
| Coord 2000 |
04089+4614 |
|
Discov num |
A 998 |
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Comp |
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Coord arcsec 2000 |
04 08 54.55 +46 13 40.2 |
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| Date first |
1905 |
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Date last |
2013 |
|
Obs |
37 |
|
| Pa first |
333 |
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Pa last |
179.5 |
|
P.A. Now (θ) |
2.5° |
|
| Sep first |
0.3 |
|
Sep last |
0.197 |
|
Sep. Now (ρ) |
0.191" |
|
| Mag pri |
7.87 |
|
Mag sec |
8.50 |
|
delta mag (ΔM) |
0.63 |
|
Spectral class |
A0V (white) |
|
| Pri motion ra |
+023 |
|
Sec motion ra |
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| Pri motion dec |
-032 |
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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 25987 |
|
Constellation |
Perseus |
|
SAO |
39339 |
|
HIP |
19366 |
|
| Tycho2 |
3328-02245-1 |
|
HD |
25987 |
|
ADS |
3007 |
|
BD |
BD+45 881 |
|
| Distance |
145.77 |
|
Distance ly |
475.5 |
|
ORBITAL ELEMENTS
| Period (P) | 158.245y | ± 7.794 |
Periastron (T) | 2010.16y | ± 2.03 |
Semi-major axis (a) | 0.2814a | ± 0.0103 |
| Eccentricity (e) | 0.6922 | ± 0.0522 |
Inclination (i) | 123.76° | ± 2.18 |
Longitude of periastron (ω) | 46.91° | ± 5.84 |
| Node (Ω) | 170.76° | ± 3.17 |
Notes | | |
Reference | Pop2000a | |
| Equinox | 2000 | |
Last observation | 1989 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
209.8 |
0.125 |
| 2001 |
205.2 |
0.124 |
| 2002 |
200.4 |
0.122 |
| 2003 |
195.4 |
0.119 |
| 2004 |
190.2 |
0.116 |
| 2005 |
184.7 |
0.112 |
| 2006 |
178.7 |
0.107 |
| 2007 |
172.1 |
0.101 |
| 2008 |
164.3 |
0.092 |
| 2009 |
154.9 |
0.082 |
| 2010 |
142.4 |
0.071 |
| 2011 |
125.3 |
0.060 |
| 2012 |
102.4 |
0.054 |
| 2013 |
77.2 |
0.055 |
| 2014 |
56.0 |
0.063 |
| 2015 |
40.9 |
0.076 |
| 2016 |
30.6 |
0.091 |
| 2017 |
23.2 |
0.107 |
| 2018 |
17.7 |
0.122 |
| 2019 |
13.4 |
0.137 |
| 2020 |
9.9 |
0.152 |
| 2021 |
7.0 |
0.166 |
| 2022 |
4.6 |
0.179 |
| 2023 |
2.5 |
0.191 |
| 2024 |
0.6 |
0.203 |
| 2025 |
359.0 |
0.214 |
| 2026 |
357.5 |
0.225 |
| 2027 |
356.1 |
0.235 |
| 2028 |
354.8 |
0.245 |
| 2029 |
353.7 |
0.254 |
| 2030 |
352.6 |
0.263 |
|
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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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