09124-0707 GAA 7 (21 Hya)
09h 12m 26.05s -07° 06' 35.3" P.A. 73.00 sep 0.0 mag 6.10,6.50 Sp A0m dist. 86.73 pc (282.91 l.y.)
| Coord 2000 |
09124-0707 |
|
Discov num |
GAA 7 |
|
Comp |
|
|
Coord arcsec 2000 |
09 12 26.05 -07 06 35.3 |
|
| Date first |
2016 |
|
Date last |
2017 |
|
Obs |
6 |
|
| Pa first |
77 |
|
Pa last |
73.2 |
|
P.A. Now (θ) |
73.2° |
|
| Sep first |
0.0 |
|
Sep last |
0.001 |
|
Sep. Now (ρ) |
0.001" |
|
| Mag pri |
6.10 |
|
Mag sec |
6.50 |
|
delta mag (ΔM) |
0.4 |
|
Spectral class |
A0m (white) |
|
| Pri motion ra |
-019 |
|
Sec motion ra |
|
|
| Pri motion dec |
+010 |
|
Sec motion dec |
|
|
| Notes |
N
O
K
(See Notes, Orbital solution, K-band or other infrared magnitudes) |
|
Visually invisible, K-band or other infrared star : Summary line gives K-band or other infrared (>1 micron) magnitudes
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
21 Hya |
|
Var name |
KW Hya |
|
Constellation |
Hydra |
|
SAO |
136662 |
|
| HIP |
45184 |
|
Tycho2 |
4891-01371-1 |
|
HD |
79193 |
|
HR |
3655 |
|
| GC |
12704 |
|
BD |
BD-06 2845 |
|
Flamsteed |
21 Hydrae |
|
Flamsteed name |
21 Hya |
|
| Distance |
86.73 |
|
Distance ly |
282.91 |
|
ORBITAL ELEMENTS
| Period (P) | 7.750468d | ± 0.000006 |
Periastron (T) | 24.421d (1858.943y) | ± 0.032 |
Semi-major axis (a) | 1.329m | ± 0.007 |
| Eccentricity (e) | 0.094 | ± 0.004 |
Inclination (i) | 92.5° | ± 0.26 |
Longitude of periastron (ω) | 225.38° | ± 1.6 |
| Node (Ω) | 75.76° | ± 0.11 |
Notes | n | |
Reference | GaA2019 | |
| Equinox | 2000 | |
Last observation | 2017 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000-01-01 |
76.0 |
0.001 |
| 2001-01-01 |
74.1 |
0.001 |
| 2002-01-01 |
68.3 |
|
| 2003-01-01 |
262.1 |
0.001 |
| 2004-01-01 |
256.8 |
0.001 |
| 2005-01-01 |
254.4 |
0.001 |
| 2006-01-01 |
235.8 |
|
| 2007-01-01 |
78.5 |
0.001 |
| 2008-01-01 |
76.0 |
0.001 |
| 2009-01-01 |
74.1 |
0.001 |
| 2010-01-01 |
68.1 |
|
| 2011-01-01 |
261.9 |
0.001 |
| 2012-01-01 |
256.8 |
0.001 |
| 2013-01-01 |
254.3 |
0.001 |
| 2014-01-01 |
234.0 |
|
| 2015-01-01 |
78.4 |
0.001 |
| 2016-01-01 |
75.9 |
0.001 |
| 2017-01-01 |
74.0 |
0.001 |
| 2018-01-01 |
67.9 |
|
| 2019-01-01 |
261.8 |
0.001 |
| 2020-01-01 |
256.8 |
0.001 |
| 2021-01-01 |
254.3 |
0.001 |
| 2022-01-01 |
231.9 |
|
| 2023-01-01 |
78.4 |
0.001 |
| 2024-01-01 |
75.9 |
0.001 |
| 2025-01-01 |
74.0 |
0.001 |
| 2026-01-01 |
67.7 |
|
| 2027-01-01 |
261.6 |
0.001 |
| 2028-01-01 |
256.7 |
0.001 |
| 2029-01-01 |
254.3 |
0.001 |
| 2030-01-01 |
229.4 |
|
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
|
|
|
|
|
|
|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|
