03342+4837 BU 787 AB (HD 21931)
03h 34m 12.97s +48° 37' 02.9" P.A. 293.00 sep 5.2 mag 7.38,11.90 Sp B9.5V dist. 261.1 pc (851.71 l.y.)
| Coord 2000 |
03342+4837 |
|
Discov num |
BU 787 |
|
Comp |
AB |
|
Coord arcsec 2000 |
03 34 12.97 +48 37 02.9 |
|
| Date first |
1881 |
|
Date last |
2016 |
|
Obs |
20 |
|
| Pa first |
229 |
|
Pa last |
293.1 |
|
P.A. Now (θ) |
293.1° |
|
| Sep first |
2.1 |
|
Sep last |
5.17 |
|
Sep. Now (ρ) |
5.17" |
|
| Mag pri |
7.38 |
|
Mag sec |
11.90 |
|
delta mag (ΔM) |
4.52 |
|
Spectral class |
B9.5V (blue-white) |
|
| Pri motion ra |
+023 |
|
Sec motion ra |
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|
| Pri motion dec |
-027 |
|
Sec motion dec |
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| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
03342+4837 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
HD 21931 |
38946 |
03 34 13 +48 37 03 |
BU 787 AB |
2016 |
20 |
293 |
5.2 |
7.38 |
11.90 |
4.52 |
Y |
<=== |
| Show |
|
38946 |
03 34 13 +48 37 03 |
BU 787 AD |
2016 |
14 |
181 |
34.5 |
7.38 |
11.75 |
4.37 |
|
|
| Show |
|
38946 |
03 34 13 +48 37 03 |
ARN 57 AE |
2015 |
14 |
29 |
175.2 |
7.38 |
8.81 |
1.43 |
|
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Quadruple system
4 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 21931 |
|
Constellation |
Perseus |
|
SAO |
38946 |
|
HIP |
16649 |
|
| Tycho2 |
3317-00589-1 |
|
Gaia DR2 |
249282105184992384 |
|
HD |
21931 |
|
ADS |
2609 |
|
| BD |
BD+48 949 |
|
Distance |
261.1 |
|
Distance ly |
851.71 |
|
ORBITAL ELEMENTS
| Period (P) | 1789.0608y | ± 794.8903 |
Periastron (T) | 1762.567y | ± 326.8226 |
Semi-major axis (a) | 13.62295a | ± 7.90366 |
| Eccentricity (e) | 0.83271 | ± 0.12449 |
Inclination (i) | 76.999° | ± 8.893 |
Longitude of periastron (ω) | 314.554° | ± 62.796 |
| Node (Ω) | 153.189° | ± 25.712 |
Notes | n | |
Reference | Izm2019 | |
| Equinox | | |
Last observation | 2015 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
290.6 |
4.736 |
| 2001 |
290.8 |
4.765 |
| 2002 |
291.0 |
4.793 |
| 2003 |
291.2 |
4.822 |
| 2004 |
291.4 |
4.851 |
| 2005 |
291.6 |
4.879 |
| 2006 |
291.8 |
4.908 |
| 2007 |
292.0 |
4.937 |
| 2008 |
292.2 |
4.965 |
| 2009 |
292.4 |
4.994 |
| 2010 |
292.6 |
5.023 |
| 2011 |
292.7 |
5.051 |
| 2012 |
292.9 |
5.080 |
| 2013 |
293.1 |
5.109 |
| 2014 |
293.3 |
5.138 |
| 2015 |
293.4 |
5.166 |
| 2016 |
293.6 |
5.195 |
| 2017 |
293.8 |
5.224 |
| 2018 |
294.0 |
5.252 |
| 2019 |
294.1 |
5.281 |
| 2020 |
294.3 |
5.310 |
| 2021 |
294.5 |
5.339 |
| 2022 |
294.6 |
5.367 |
| 2023 |
294.8 |
5.396 |
| 2024 |
294.9 |
5.425 |
| 2025 |
295.1 |
5.454 |
| 2026 |
295.3 |
5.482 |
| 2027 |
295.4 |
5.511 |
| 2028 |
295.6 |
5.540 |
| 2029 |
295.7 |
5.568 |
| 2030 |
295.9 |
5.597 |
|
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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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