21176+8231 STF 2807 (HD 204372)
21h 17m 33.47s +82° 31' 03.7" P.A. 310.00 sep 1.8 mag 8.65,8.77 Sp F8 dist. 75.02 pc (244.72 l.y.)
Coord 2000 |
21176+8231 |
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Discov num |
STF2807 |
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Comp |
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Coord arcsec 2000 |
21 17 33.47 +82 31 03.7 |
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Date first |
1829 |
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Date last |
2019 |
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Obs |
46 |
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Pa first |
315 |
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Pa last |
309.5 |
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P.A. Now (θ) |
309.5° |
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Sep first |
1.9 |
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Sep last |
1.785 |
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Sep. Now (ρ) |
1.785" |
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Mag pri |
8.65 |
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Mag sec |
8.77 |
|
delta mag (ΔM) |
0.12 |
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Spectral class |
F8 (yellow-white) |
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Pri motion ra |
+012 |
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Sec motion ra |
+012 |
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Pri motion dec |
+082 |
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Sec motion dec |
+082 |
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Notes |
O
(Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 204372 |
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Constellation |
Cepheus |
|
SAO |
3550 |
|
HIP |
105112 |
|
Tycho2 |
4649-00045-1 |
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Gaia DR2 |
2298698382656425216 |
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HD |
204372 |
|
GC |
29930 |
|
ADS |
14921 |
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BD |
BD+81 737 |
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Distance |
75.02 |
|
Distance ly |
244.72 |
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ORBITAL ELEMENTS
Period (P) | 2818.9854y | ± 1456.9941 |
Periastron (T) | 1641.0222y | ± 501.3932 |
Semi-major axis (a) | 6.15221a | ± 4.16702 |
Eccentricity (e) | 0.80384 | ± 0.1589 |
Inclination (i) | 91.733° | ± 3.879 |
Longitude of periastron (ω) | 108.438° | ± 25.004 |
Node (Ω) | 136.406° | ± 5.633 |
Notes | | |
Reference | Izm2019 | |
Equinox | | |
Last observation | 2015 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
310.7 |
1.851 |
2001 |
310.7 |
1.847 |
2002 |
310.7 |
1.842 |
2003 |
310.7 |
1.838 |
2004 |
310.6 |
1.833 |
2005 |
310.6 |
1.829 |
2006 |
310.6 |
1.825 |
2007 |
310.6 |
1.820 |
2008 |
310.5 |
1.816 |
2009 |
310.5 |
1.811 |
2010 |
310.5 |
1.807 |
2011 |
310.5 |
1.802 |
2012 |
310.4 |
1.798 |
2013 |
310.4 |
1.793 |
2014 |
310.4 |
1.789 |
2015 |
310.3 |
1.784 |
2016 |
310.3 |
1.780 |
2017 |
310.3 |
1.775 |
2018 |
310.3 |
1.770 |
2019 |
310.2 |
1.766 |
2020 |
310.2 |
1.761 |
2021 |
310.2 |
1.757 |
2022 |
310.2 |
1.752 |
2023 |
310.1 |
1.748 |
2024 |
310.1 |
1.743 |
2025 |
310.1 |
1.738 |
2026 |
310.0 |
1.734 |
2027 |
310.0 |
1.729 |
2028 |
310.0 |
1.725 |
2029 |
310.0 |
1.720 |
2030 |
309.9 |
1.715 |
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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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