12155-3106 RST 1658 (HD 106549)
12h 15m 26.96s -31° 05' 38.2" P.A. 193.00 sep 0.5 mag 10.17,11.32 Sp K7V dist. 21.4 pc (69.81 l.y.)
| Coord 2000 |
12155-3106 |
|
Discov num |
RST1658 |
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Comp |
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Coord arcsec 2000 |
12 15 26.96 -31 05 38.2 |
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| Date first |
1931 |
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Date last |
2021 |
|
Obs |
26 |
|
| Pa first |
82 |
|
Pa last |
193 |
|
P.A. Now (θ) |
193° |
|
| Sep first |
0.4 |
|
Sep last |
0.538 |
|
Sep. Now (ρ) |
0.538" |
|
| Mag pri |
10.17 |
|
Mag sec |
11.32 |
|
delta mag (ΔM) |
1.15 |
|
Spectral class |
K7V (yellow-orange) |
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| Pri motion ra |
+164 |
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Sec motion ra |
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|
| Pri motion dec |
-074 |
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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 106549 |
|
Constellation |
Hydra |
|
SAO |
203284 |
|
HIP |
59780 |
|
| Tycho2 |
7232-00584-1 |
|
Gaia DR2 |
3472485972258777088 |
|
HD |
106549 |
|
CD |
CD-30 9789 |
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| CP |
CP-30 3447 |
|
Distance |
21.4 |
|
Distance ly |
69.81 |
|
ORBITAL ELEMENTS
| Period (P) | 62y | ± 0.2 |
Periastron (T) | 2047.37y | ± 0.2 |
Semi-major axis (a) | 0.68a | ± 0.004 |
| Eccentricity (e) | 0.226 | ± 0.003 |
Inclination (i) | 51.4° | ± 0.5 |
Longitude of periastron (ω) | 240.7° | ± 1 |
| Node (Ω) | 116.9° | ± 0.5 |
Notes | | |
Reference | Doc2018l | |
| Equinox | 2000 | |
Last observation | 2018 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
111.4 |
0.696 |
| 2001 |
114.7 |
0.715 |
| 2002 |
117.8 |
0.729 |
| 2003 |
120.8 |
0.740 |
| 2004 |
123.8 |
0.747 |
| 2005 |
126.7 |
0.751 |
| 2006 |
129.6 |
0.750 |
| 2007 |
132.5 |
0.747 |
| 2008 |
135.4 |
0.741 |
| 2009 |
138.4 |
0.732 |
| 2010 |
141.5 |
0.720 |
| 2011 |
144.7 |
0.707 |
| 2012 |
148.1 |
0.691 |
| 2013 |
151.6 |
0.674 |
| 2014 |
155.3 |
0.656 |
| 2015 |
159.2 |
0.637 |
| 2016 |
163.3 |
0.617 |
| 2017 |
167.7 |
0.598 |
| 2018 |
172.5 |
0.579 |
| 2019 |
177.5 |
0.561 |
| 2020 |
182.8 |
0.544 |
| 2021 |
188.5 |
0.529 |
| 2022 |
194.5 |
0.517 |
| 2023 |
200.7 |
0.508 |
| 2024 |
207.1 |
0.501 |
| 2025 |
213.7 |
0.498 |
| 2026 |
220.2 |
0.498 |
| 2027 |
226.8 |
0.502 |
| 2028 |
233.2 |
0.508 |
| 2029 |
239.4 |
0.517 |
| 2030 |
245.4 |
0.528 |
|
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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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