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 |
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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 |
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Obs |
26 |
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Pa first |
82 |
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Pa last |
193 |
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P.A. Now (θ) |
193° |
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Sep first |
0.4 |
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Sep last |
0.538 |
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Sep. Now (ρ) |
0.538" |
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Mag pri |
10.17 |
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Mag sec |
11.32 |
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delta mag (ΔM) |
1.15 |
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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 |
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Constellation |
Hydra |
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SAO |
203284 |
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HIP |
59780 |
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Tycho2 |
7232-00584-1 |
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Gaia DR2 |
3472485972258777088 |
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HD |
106549 |
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CD |
CD-30 9789 |
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CP |
CP-30 3447 |
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Distance |
21.4 |
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Distance ly |
69.81 |
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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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