20374+7536 HEI   7 (VW Cep)

 
 
20h 37m 21.54s +75 36' 01.5" P.A. 289.60 sep 0.5 mag 7.68,10.48 Sp K0V dist. 27.59 pc (90 l.y.)
 
 
Coord 2000
20374+7536
Discov num
HEI   7
Comp
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)
289.6°
Sep first
0.6
Sep last
0.7
Sep. Now (ρ)
0.47"
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
Pri motion dec
+540
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
231
Precise sep
0.675
Var name
VW Cep
Constellation
Cepheus
SAO
9828
HIP
101750
Tycho2
4585-03284-1
Gaia DR2
80881186176
HD
197433
GL
GJ 1255A
BD
BD+75 752
Distance
27.59
Distance ly
90
last precise pa
231
last precise sep
0.675
 
 
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° Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2007
label rho theta
2000 0.374 190.4
2001 0.447 200.3
2002 0.507 207.6
2003 0.557 213.4
2004 0.598 218.4
2005 0.631 222.8
2006 0.657 226.8
2007 0.677 230.5
2008 0.691 234.0
2009 0.699 237.5
2010 0.703 240.8
2011 0.702 244.2
2012 0.697 247.6
2013 0.687 251.0
2014 0.673 254.6
2015 0.655 258.4
2016 0.633 262.4
2017 0.607 266.7
2018 0.577 271.4
2019 0.544 276.7
2020 0.508 282.7
2021 0.468 289.6
2022 0.425 298.0
2023 0.379 308.3
2024 0.332 321.4
2025 0.283 339.1
2026 0.232 4.2
2027 0.177 44.5
2028 0.157 110.4
2029 0.229 159.1
2030 0.321 181.6

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
 
grafico orbita






wds20374%2B7536a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
20374+7536 HEI 7 1999 15 187 0.4 7.68 10.48 K0V NOD 203720.82+753556.7
20374+7536 HEI 7 2007 17 232 0.7 7.68 10.48 K0V NOD 203720.82+753556.7

If you need more information about this double, apply for a data request form to the WDS.