03217+0845 STF 380 (HD 20837)
03h 21m 43.84s +08° 45' 23.5" P.A. 4.00 sep 0.9 mag 9.02,9.81 Sp G0
| Coord 2000 |
03217+0845 |
|
Discov num |
STF 380 |
|
Comp |
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Coord arcsec 2000 |
03 21 43.84 +08 45 23.5 |
|
| Date first |
1829 |
|
Date last |
2018 |
|
Obs |
92 |
|
| Pa first |
90 |
|
Pa last |
4 |
|
P.A. Now (θ) |
4° |
|
| Sep first |
1.5 |
|
Sep last |
0.888 |
|
Sep. Now (ρ) |
0.888" |
|
| Mag pri |
9.02 |
|
Mag sec |
9.81 |
|
delta mag (ΔM) |
0.79 |
|
Spectral class |
G0 (yellow) |
|
| Pri motion ra |
-027 |
|
Sec motion ra |
-027 |
|
| Pri motion dec |
-098 |
|
Sec motion dec |
-098 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 20837 |
|
Constellation |
Cetus |
|
SAO |
111150 |
|
Tycho2 |
0649-00737-1 |
|
| Gaia DR2 |
11143687789164544 |
|
HD |
20837 |
|
GC |
4015 |
|
ADS |
2491 |
|
ORBITAL ELEMENTS
| Period (P) | 663.5558y | ± 324.0899 |
Periastron (T) | 1786.8967y | ± 49.1078 |
Semi-major axis (a) | 1.47962a | ± 0.40496 |
| Eccentricity (e) | 0.35215 | ± 0.23884 |
Inclination (i) | 119.531° | ± 9.369 |
Longitude of periastron (ω) | 293.683° | ± 36.696 |
| Node (Ω) | 83.256° | ± 14.967 |
Notes | n | |
Reference | Izm2019 | |
| Equinox | | |
Last observation | 2008 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
15.6 |
0.951 |
| 2001 |
15.0 |
0.949 |
| 2002 |
14.3 |
0.948 |
| 2003 |
13.7 |
0.947 |
| 2004 |
13.1 |
0.945 |
| 2005 |
12.5 |
0.944 |
| 2006 |
11.9 |
0.943 |
| 2007 |
11.3 |
0.942 |
| 2008 |
10.7 |
0.941 |
| 2009 |
10.0 |
0.940 |
| 2010 |
9.4 |
0.940 |
| 2011 |
8.8 |
0.939 |
| 2012 |
8.2 |
0.938 |
| 2013 |
7.6 |
0.938 |
| 2014 |
6.9 |
0.937 |
| 2015 |
6.3 |
0.937 |
| 2016 |
5.7 |
0.936 |
| 2017 |
5.1 |
0.936 |
| 2018 |
4.4 |
0.936 |
| 2019 |
3.8 |
0.935 |
| 2020 |
3.2 |
0.935 |
| 2021 |
2.5 |
0.935 |
| 2022 |
1.9 |
0.935 |
| 2023 |
1.3 |
0.935 |
| 2024 |
0.7 |
0.936 |
| 2025 |
|
0.936 |
| 2026 |
359.4 |
0.936 |
| 2027 |
358.8 |
0.936 |
| 2028 |
358.2 |
0.937 |
| 2029 |
357.5 |
0.937 |
| 2030 |
356.9 |
0.938 |
|
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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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