10557+0044 BU 1076 (55 Leo)
10h 55m 42.40s +00° 44' 13.0" P.A. 48.00 sep 1.1 mag 5.98,9.02 Sp F4V dist. 44.86 pc (146.33 l.y.)
| Coord 2000 |
10557+0044 |
|
Discov num |
BU 1076 |
|
Comp |
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Coord arcsec 2000 |
10 55 42.40 +00 44 13.0 |
|
| Date first |
1889 |
|
Date last |
2021 |
|
Obs |
62 |
|
| Pa first |
50 |
|
Pa last |
48.4 |
|
P.A. Now (θ) |
47.9° |
|
| Sep first |
1.0 |
|
Sep last |
1.075 |
|
Sep. Now (ρ) |
1.064" |
|
| Mag pri |
5.98 |
|
Mag sec |
9.02 |
|
delta mag (ΔM) |
3.04 |
|
Spectral class |
F4V (yellow-white) |
|
| Pri motion ra |
+100 |
|
Sec motion ra |
+103 |
|
| Pri motion dec |
+000 |
|
Sec motion dec |
-003 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
rPM=0.041 (< 0.3, Physical double)
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
55 Leo |
|
Constellation |
Leo |
|
SAO |
118574 |
|
HIP |
53423 |
|
| Tycho2 |
0255-01197-1 |
|
Gaia DR2 |
3807937319101754112 |
|
HD |
94672 |
|
HR |
4265 |
|
| GC |
15022 |
|
ADS |
7982 |
|
BD |
BD+01 2501 |
|
Flamsteed |
55 Leonis |
|
| Flamsteed name |
55 Leo |
|
Distance |
44.86 |
|
Distance ly |
146.33 |
|
ORBITAL ELEMENTS
| Period (P) | 138.9y | ± 3.02 |
Periastron (T) | 1921.62y | ± 5.07 |
Semi-major axis (a) | 0.75a | ± 0.069 |
| Eccentricity (e) | 0.714 | ± 0.036 |
Inclination (i) | 125.7° | ± 9.5 |
Longitude of periastron (ω) | 323.4° | ± 10.8 |
| Node (Ω) | 219.3° | ± 4 |
Notes | n | |
Reference | Tok2015c | |
| Equinox | 2000 | |
Last observation | 2014 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
58.7 |
1.154 |
| 2001 |
58.2 |
1.155 |
| 2002 |
57.8 |
1.156 |
| 2003 |
57.3 |
1.156 |
| 2004 |
56.9 |
1.156 |
| 2005 |
56.4 |
1.156 |
| 2006 |
56.0 |
1.155 |
| 2007 |
55.5 |
1.154 |
| 2008 |
55.1 |
1.152 |
| 2009 |
54.6 |
1.149 |
| 2010 |
54.2 |
1.147 |
| 2011 |
53.7 |
1.143 |
| 2012 |
53.3 |
1.140 |
| 2013 |
52.8 |
1.136 |
| 2014 |
52.3 |
1.131 |
| 2015 |
51.9 |
1.126 |
| 2016 |
51.4 |
1.120 |
| 2017 |
50.9 |
1.114 |
| 2018 |
50.4 |
1.107 |
| 2019 |
50.0 |
1.100 |
| 2020 |
49.5 |
1.092 |
| 2021 |
49.0 |
1.083 |
| 2022 |
48.4 |
1.074 |
| 2023 |
47.9 |
1.064 |
| 2024 |
47.4 |
1.054 |
| 2025 |
46.8 |
1.043 |
| 2026 |
46.3 |
1.031 |
| 2027 |
45.7 |
1.019 |
| 2028 |
45.1 |
1.006 |
| 2029 |
44.5 |
0.992 |
| 2030 |
43.9 |
0.978 |
| 2031 |
43.3 |
0.962 |
| 2032 |
42.6 |
0.946 |
| 2033 |
42.0 |
0.930 |
| 2034 |
41.3 |
0.912 |
| 2035 |
40.5 |
0.893 |
| 2036 |
39.8 |
0.874 |
| 2037 |
39.0 |
0.853 |
| 2038 |
38.1 |
0.832 |
| 2039 |
37.3 |
0.809 |
| 2040 |
36.3 |
0.785 |
| 2041 |
35.3 |
0.760 |
| 2042 |
34.2 |
0.734 |
| 2043 |
33.1 |
0.707 |
| 2044 |
31.9 |
0.678 |
| 2045 |
30.5 |
0.648 |
| 2046 |
29.0 |
0.616 |
| 2047 |
27.4 |
0.583 |
| 2048 |
25.5 |
0.548 |
| 2049 |
23.4 |
0.511 |
| 2050 |
20.9 |
0.472 |
|
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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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