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 |
|
Discov num |
HEI 7 |
|
Comp |
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Coord arcsec 2000 |
20 37 21.54 +75 36 01.5 |
|
| Date first |
1974 |
|
Date last |
2007 |
|
Obs |
18 |
|
| Pa first |
223 |
|
Pa last |
231 |
|
P.A. Now (θ) |
231° |
|
| Sep first |
0.6 |
|
Sep last |
0.675 |
|
Sep. Now (ρ) |
0.675" |
|
| Mag pri |
7.68 |
|
Mag sec |
10.48 |
|
delta mag (ΔM) |
2.8 |
|
Spectral class |
K0V (yellow-orange) |
|
| Pri motion ra |
+309 |
|
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 |
|
Constellation |
Cepheus |
|
SAO |
9828 |
|
HIP |
101750 |
|
| Tycho2 |
4585-03284-1 |
|
Gaia DR2 |
2278045980881186176 |
|
HD |
197433 |
|
GC |
28804 |
|
| GL |
GJ 1255A |
|
BD |
BD+75 752 |
|
Distance |
27.59 |
|
Distance ly |
90 |
|
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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