20374+7536 HEI 7 (VW Cep)
20h 37m 21.54s +75° 36' 01.5" P.A. 231.00 sep 0.7 mag 7.68,10.48 Sp K0V dist. 27.59 pc (90 l.y.)
Coord 2000 |
20374+7536 |
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Discov num |
HEI 7 |
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Comp |
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Coord arcsec 2000 |
20 37 21.54 +75 36 01.5 |
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Date first |
1974 |
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Date last |
2007 |
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Obs |
18 |
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Pa first |
223 |
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Pa last |
231 |
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P.A. Now (θ) |
231° |
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Sep first |
0.6 |
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Sep last |
0.675 |
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Sep. Now (ρ) |
0.675" |
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Mag pri |
7.68 |
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Mag sec |
10.48 |
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delta mag (ΔM) |
2.8 |
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Spectral class |
K0V (yellow-orange) |
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Pri motion ra |
+309 |
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Sec motion ra |
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Pri motion dec |
+540 |
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Sec motion dec |
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Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Var name |
VW Cep |
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Constellation |
Cepheus |
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SAO |
9828 |
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HIP |
101750 |
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Tycho2 |
4585-03284-1 |
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Gaia DR2 |
2278045980881186176 |
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HD |
197433 |
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GC |
28804 |
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GL |
GJ 1255A |
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BD |
BD+75 752 |
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Distance |
27.59 |
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Distance ly |
90 |
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ORBITAL ELEMENTS
Period (P) | 30.64y | |
Periastron (T) | 1996.75y | |
Semi-major axis (a) | 0.469a | |
Eccentricity (e) | 0.629 | |
Inclination (i) | 34.4° | |
Longitude of periastron (ω) | 46.9° | |
Node (Ω) | 26.4° | |
Notes | n | |
Reference | Doc2013k | |
Equinox | 2000 | |
Last observation | 2007 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
190.4 |
0.374 |
2001 |
200.3 |
0.447 |
2002 |
207.6 |
0.507 |
2003 |
213.4 |
0.557 |
2004 |
218.4 |
0.598 |
2005 |
222.8 |
0.631 |
2006 |
226.8 |
0.657 |
2007 |
230.5 |
0.677 |
2008 |
234.0 |
0.691 |
2009 |
237.5 |
0.699 |
2010 |
240.8 |
0.703 |
2011 |
244.2 |
0.702 |
2012 |
247.6 |
0.697 |
2013 |
251.0 |
0.687 |
2014 |
254.6 |
0.673 |
2015 |
258.4 |
0.655 |
2016 |
262.4 |
0.633 |
2017 |
266.7 |
0.607 |
2018 |
271.4 |
0.577 |
2019 |
276.7 |
0.544 |
2020 |
282.7 |
0.508 |
2021 |
289.6 |
0.468 |
2022 |
298.0 |
0.425 |
2023 |
308.3 |
0.379 |
2024 |
321.4 |
0.332 |
2025 |
339.1 |
0.283 |
2026 |
4.2 |
0.232 |
2027 |
44.5 |
0.177 |
2028 |
110.4 |
0.157 |
2029 |
159.1 |
0.229 |
2030 |
181.6 |
0.321 |
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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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