09100-2845 B 179 (HD 78921)
09h 09m 57.24s -28° 45' 20.7" P.A. 113.00 sep 0.1 mag 9.44,9.64 Sp K0V dist. 55.9 pc (182.35 l.y.)
| Coord 2000 |
09100-2845 |
|
Discov num |
B 179 |
|
Comp |
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Coord arcsec 2000 |
09 09 57.24 -28 45 20.7 |
|
| Date first |
1927 |
|
Date last |
2020 |
|
Obs |
40 |
|
| Pa first |
161 |
|
Pa last |
112.9 |
|
P.A. Now (θ) |
69.2° |
|
| Sep first |
0.4 |
|
Sep last |
0.126 |
|
Sep. Now (ρ) |
0.092" |
|
| Mag pri |
9.44 |
|
Mag sec |
9.64 |
|
delta mag (ΔM) |
0.2 |
|
Spectral class |
K0V (yellow-orange) |
|
| Pri motion ra |
-013 |
|
Sec motion ra |
-013 |
|
| Pri motion dec |
-077 |
|
Sec motion dec |
-077 |
|
| Notes |
O
(Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 78921 |
|
Constellation |
Pyxis |
|
SAO |
177059 |
|
HIP |
45003 |
|
| Tycho2 |
6598-01373-1 |
|
Gaia DR2 |
5636015416217477504 |
|
HD |
78921 |
|
ADS |
7223 |
|
| CD |
CD-28 6981 |
|
CP |
CP-28 3635 |
|
Distance |
55.9 |
|
Distance ly |
182.35 |
|
ORBITAL ELEMENTS
| Period (P) | 80.35y | ± 0.84 |
Periastron (T) | 2026.88y | ± 0.62 |
Semi-major axis (a) | 0.372a | ± 0.006 |
| Eccentricity (e) | 0.562 | ± 0.025 |
Inclination (i) | 116.3° | ± 1.3 |
Longitude of periastron (ω) | 158.5° | ± 3 |
| Node (Ω) | 169.4° | ± 1.1 |
Notes | | |
Reference | Tok2019c | |
| Equinox | | |
Last observation | 2018 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
169.5 |
0.534 |
| 2001 |
168.7 |
0.526 |
| 2002 |
167.8 |
0.518 |
| 2003 |
167.0 |
0.508 |
| 2004 |
166.1 |
0.497 |
| 2005 |
165.1 |
0.485 |
| 2006 |
164.1 |
0.472 |
| 2007 |
163.1 |
0.458 |
| 2008 |
161.9 |
0.442 |
| 2009 |
160.7 |
0.425 |
| 2010 |
159.4 |
0.407 |
| 2011 |
158.0 |
0.388 |
| 2012 |
156.4 |
0.367 |
| 2013 |
154.6 |
0.344 |
| 2014 |
152.5 |
0.321 |
| 2015 |
150.1 |
0.295 |
| 2016 |
147.3 |
0.268 |
| 2017 |
143.7 |
0.240 |
| 2018 |
139.3 |
0.211 |
| 2019 |
133.3 |
0.181 |
| 2020 |
125.0 |
0.151 |
| 2021 |
112.7 |
0.123 |
| 2022 |
94.3 |
0.101 |
| 2023 |
69.2 |
0.092 |
| 2024 |
43.1 |
0.098 |
| 2025 |
22.9 |
0.116 |
| 2026 |
8.7 |
0.138 |
| 2027 |
358.2 |
0.156 |
| 2028 |
349.5 |
0.167 |
| 2029 |
341.6 |
0.171 |
| 2030 |
333.7 |
0.168 |
|
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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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