21287+7034 LAB   6Aa,Ab

 
 
21H 28M 39.58S +70 33' 38.5" P.A. 45.9 SEP 0.26 MAG 3.2,6.6 SP B2III DIST. 210.08 PC (685.28 L.Y.)
 
 
Coord 2000
21287+7034
Discov num
LAB   6
Comp
Aa,Ab
Coord arcsec 2000
21 28 39.58 +70 33 38.5
Date first
1971
Date last
2007
Obs
62
Pa first
47
Pa last
226
P.A. Now (θ)
45.9°
Sep first
0.3
Sep last
0.2
Sep. Now (ρ)
0.26"
Mag pri
3.2
Mag sec
6.6
delta mag (ΔM)
3.4
Spectral class
B2III (blue-white)
Pri motion ra
+010
Sec motion ra
Pri motion dec
+007
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
21287+7034 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 10057 21287+7034 LAB 6 Aa,Ab 1971 2007 62 46 0.3 3.20 6.60 3.40 Y <===
Show Alfirk 10057 21287+7034 STF2806 AB 1779 2016 103 251 13.5 3.17 8.63 5.46
Triple system
2 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Cepheus
SAO
10057
HIP
106032
HD
205021
HR
8238
GC
30118
ADS
15032
BD
BD+69 1173
Bayer
Beta Cephei
Bayer name
Bet Cep
Flamsteed
8 Cephei
Flamsteed name
8 Cep
Distance
210.08
Distance ly
685.28
last precise pa
226
last precise sep
0.172
 
 
ORBITAL ELEMENTS
 
 
Period (P)83y Periastron (T)1997.99y Semi-major axis (a)0.195a
Eccentricity (e)0.732 Inclination (i)87.3° Longitude of periastron (ω)194.6°
Node (Ω)46.4° Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation1998
label rho theta
2000 0.011 243.9
2001 0.016 31.7
2002 0.040 40.1
2003 0.063 42.2
2004 0.085 43.2
2005 0.104 43.8
2006 0.123 44.2
2007 0.140 44.5
2008 0.156 44.7
2009 0.171 44.9
2010 0.185 45.1
2011 0.197 45.2
2012 0.210 45.4
2013 0.221 45.5
2014 0.231 45.6
2015 0.241 45.7
2016 0.251 45.8
2017 0.259 45.9
2018 0.267 45.9
2019 0.275 46.0
2020 0.281 46.1
2021 0.288 46.1
2022 0.294 46.2
2023 0.299 46.3
2024 0.304 46.3
2025 0.308 46.4
2026 0.312 46.4
2027 0.316 46.5
2028 0.319 46.5
2029 0.322 46.6
2030 0.324 46.6

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

grafico orbita





grafico misure orbit6
Measures: green=micrometric, blue=interferometric, purple=photographic