21370+8255 STF 2837 (HD 207146)
21h 36m 58.67s +82° 55' 16.5" P.A. 269.00 sep 3.2 mag 8.84,9.36 Sp G5
Coord 2000 |
21370+8255 |
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Discov num |
STF2837 |
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Comp |
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Coord arcsec 2000 |
21 36 58.67 +82 55 16.5 |
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Date first |
1832 |
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Date last |
2018 |
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Obs |
88 |
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Pa first |
321 |
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Pa last |
268.8 |
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P.A. Now (θ) |
268.8° |
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Sep first |
2.2 |
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Sep last |
3.202 |
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Sep. Now (ρ) |
3.202" |
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Mag pri |
8.84 |
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Mag sec |
9.36 |
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delta mag (ΔM) |
0.52 |
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Spectral class |
G5 (yellow) |
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Pri motion ra |
+007 |
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Sec motion ra |
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Pri motion dec |
-051 |
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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 207146 |
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Constellation |
Cepheus |
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SAO |
3606 |
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Tycho2 |
4649-00057-1 |
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Gaia DR2 |
2300220420283692672 |
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HD |
207146 |
|
GC |
30375 |
|
ADS |
15229 |
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ORBITAL ELEMENTS
Period (P) | 1153.3017y | ± 590.6734 |
Periastron (T) | 1794.7941y | ± 82.5643 |
Semi-major axis (a) | 4.69589a | ± 1.90688 |
Eccentricity (e) | 0.846 | ± 0.20093 |
Inclination (i) | 116.269° | ± 15.188 |
Longitude of periastron (ω) | 95.766° | ± 15.376 |
Node (Ω) | 146.809° | ± 64.776 |
Notes | | |
Reference | Izm2019 | |
Equinox | | |
Last observation | 2015 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
271.8 |
3.115 |
2001 |
271.7 |
3.118 |
2002 |
271.5 |
3.122 |
2003 |
271.3 |
3.125 |
2004 |
271.2 |
3.129 |
2005 |
271.0 |
3.132 |
2006 |
270.8 |
3.136 |
2007 |
270.7 |
3.139 |
2008 |
270.5 |
3.142 |
2009 |
270.3 |
3.146 |
2010 |
270.2 |
3.149 |
2011 |
270.0 |
3.152 |
2012 |
269.8 |
3.156 |
2013 |
269.7 |
3.159 |
2014 |
269.5 |
3.162 |
2015 |
269.4 |
3.166 |
2016 |
269.2 |
3.169 |
2017 |
269.0 |
3.172 |
2018 |
268.9 |
3.175 |
2019 |
268.7 |
3.179 |
2020 |
268.5 |
3.182 |
2021 |
268.4 |
3.185 |
2022 |
268.2 |
3.188 |
2023 |
268.1 |
3.191 |
2024 |
267.9 |
3.195 |
2025 |
267.8 |
3.198 |
2026 |
267.6 |
3.201 |
2027 |
267.4 |
3.204 |
2028 |
267.3 |
3.207 |
2029 |
267.1 |
3.210 |
2030 |
267.0 |
3.213 |
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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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