21287+7034 STF 2806 AB (Alfirk)
21h 28m 39.58s +70° 33' 38.5" P.A. 250.00 sep 13.6 mag 3.17,8.63 Sp B1IV dist. 210.08 pc (685.28 l.y.)
| Coord 2000 |
21287+7034 |
|
Discov num |
STF2806 |
|
Comp |
AB |
|
Coord arcsec 2000 |
21 28 39.58 +70 33 38.5 |
|
| Date first |
1779 |
|
Date last |
2020 |
|
Obs |
104 |
|
| Pa first |
255 |
|
Pa last |
249.8 |
|
P.A. Now (θ) |
249.8° |
|
| Sep first |
13.1 |
|
Sep last |
13.649 |
|
Sep. Now (ρ) |
13.649" |
|
| Mag pri |
3.17 |
|
Mag sec |
8.63 |
|
delta mag (ΔM) |
5.46 |
|
Spectral class |
B1IV (blue-white) |
|
| Pri motion ra |
+013 |
|
Sec motion ra |
+010 |
|
| Pri motion dec |
+008 |
|
Sec motion dec |
+006 |
|
| Notes |
N
(See Notes) |
|
rPM=0.236 (< 0.3, Physical double)
This double is physical.
21287+7034 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
10057 |
21 28 40 +70 33 38 |
LAB 6 Aa,Ab |
2007 |
85 |
226 |
0.2 |
3.20 |
6.60 |
3.40 |
Y |
|
| Show |
Alfirk |
10057 |
21 28 40 +70 33 38 |
STF 2806 AB |
2020 |
104 |
250 |
13.6 |
3.17 |
8.63 |
5.46 |
|
<=== |
Triple system
2 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Common name |
Alfirk |
|
Constellation |
Cepheus |
|
SAO |
10057 |
|
HIP |
106032 |
|
| Tycho2 |
4465-02643-1 |
|
Gaia DR2 |
2272185759992826624 |
|
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 |
|
FK5 |
809 |
|
| Distance |
210.08 |
|
Distance ly |
685.28 |
|
Bayer greek |
β Cep |
|
