09278-0604 B 2530 (HD 81809)
09h 27m 46.78s -06° 04' 16.4" P.A. 143.00 sep 0.3 mag 5.63,7.52 Sp G2V dist. 30.41 pc (99.2 l.y.)
| Coord 2000 |
09278-0604 |
|
Discov num |
B 2530 |
|
Comp |
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Coord arcsec 2000 |
09 27 46.78 -06 04 16.4 |
|
| Date first |
1938 |
|
Date last |
2021 |
|
Obs |
77 |
|
| Pa first |
319 |
|
Pa last |
143.2 |
|
P.A. Now (θ) |
145.9° |
|
| Sep first |
0.2 |
|
Sep last |
0.259 |
|
Sep. Now (ρ) |
0.357" |
|
| Mag pri |
5.63 |
|
Mag sec |
7.52 |
|
delta mag (ΔM) |
1.89 |
|
Spectral class |
G2V (yellow) |
|
| Pri motion ra |
-227 |
|
Sec motion ra |
-227 |
|
| Pri motion dec |
-077 |
|
Sec motion dec |
-077 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 81809 |
|
Constellation |
Hydra |
|
SAO |
136872 |
|
HIP |
46404 |
|
| Tycho2 |
4893-01379-1 |
|
Gaia DR2 |
5745464991235898752 |
|
HD |
81809 |
|
HR |
3750 |
|
| GC |
13048 |
|
GL |
Gl 344A |
|
BD |
BD-05 2802 |
|
Distance |
30.41 |
|
| Distance ly |
99.2 |
|
ORBITAL ELEMENTS
| Period (P) | 34.8y | ± 0.06 |
Periastron (T) | 2010.11y | ± 0.1 |
Semi-major axis (a) | 0.428a | ± 0.001 |
| Eccentricity (e) | 0.27 | ± 0.003 |
Inclination (i) | 85.4° | ± 0.1 |
Longitude of periastron (ω) | 341.9° | ± 1.1 |
| Node (Ω) | 330.8° | ± 0.1 |
Notes | n | |
Reference | Tok2015c | |
| Equinox | 2000 | |
Last observation | 2014 | |
Grade | 2 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
153.5 |
0.415 |
| 2001 |
154.5 |
0.363 |
| 2002 |
155.8 |
0.302 |
| 2003 |
157.9 |
0.233 |
| 2004 |
161.9 |
0.156 |
| 2005 |
174.3 |
0.076 |
| 2006 |
271.2 |
0.034 |
| 2007 |
316.4 |
0.106 |
| 2008 |
323.9 |
0.183 |
| 2009 |
327.1 |
0.248 |
| 2010 |
329.1 |
0.293 |
| 2011 |
330.7 |
0.315 |
| 2012 |
332.1 |
0.312 |
| 2013 |
333.8 |
0.285 |
| 2014 |
335.9 |
0.240 |
| 2015 |
339.2 |
0.183 |
| 2016 |
346.0 |
0.117 |
| 2017 |
10.0 |
0.053 |
| 2018 |
103.1 |
0.048 |
| 2019 |
131.8 |
0.111 |
| 2020 |
139.2 |
0.178 |
| 2021 |
142.6 |
0.243 |
| 2022 |
144.6 |
0.303 |
| 2023 |
145.9 |
0.357 |
| 2024 |
146.9 |
0.405 |
| 2025 |
147.7 |
0.447 |
| 2026 |
148.4 |
0.480 |
| 2027 |
149.0 |
0.507 |
| 2028 |
149.6 |
0.525 |
| 2029 |
150.1 |
0.535 |
| 2030 |
150.6 |
0.536 |
| 2031 |
151.1 |
0.528 |
| 2032 |
151.6 |
0.512 |
| 2033 |
152.2 |
0.486 |
| 2034 |
152.9 |
0.450 |
| 2035 |
153.7 |
0.406 |
| 2036 |
154.7 |
0.352 |
| 2037 |
156.2 |
0.289 |
| 2038 |
158.5 |
0.218 |
| 2039 |
163.2 |
0.140 |
| 2040 |
180.7 |
0.060 |
| 2041 |
291.1 |
0.045 |
| 2042 |
318.7 |
0.122 |
| 2043 |
324.8 |
0.197 |
| 2044 |
327.6 |
0.259 |
| 2045 |
329.4 |
0.300 |
| 2046 |
331.0 |
0.316 |
| 2047 |
332.5 |
0.308 |
| 2048 |
334.1 |
0.277 |
| 2049 |
336.4 |
0.230 |
| 2050 |
340.1 |
0.170 |
|
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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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