Coord 2000 | 21287+7034 |
Discov num | LAB 6 |
Comp | Aa,Ab |
Coord arcsec 2000 | 21 28 39.58 +70 33 38.5 |
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Date first | 1971 |
Date last | 2007 |
Obs | 62 |
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Pa first | 47 |
Pa last | 226 |
P.A. Now (θ) | 46° |
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Sep first | 0.3 |
Sep last | 0.2 |
Sep. Now (ρ) | 0.28" |
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Mag pri | 3.20 |
Mag sec | 6.60 |
delta mag (ΔM) | 3.4 |
Spectral class | B2III (blue-white) |
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Pri motion ra | +010 |
Sec motion ra | |||||||||
Pri motion dec | +007 |
Sec motion dec | |||||||||
Notes |
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 |
Precise pa | 226 |
Precise sep | 0.172 |
Constellation | Cepheus |
SAO | 10057 |
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HIP | 106032 |
Gaia DR2 | 59992826624 |
HD | 205021 |
HR | 8238 |
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GC | 30118 |
ADS | 15032 |
BD | BD+69 1173 |
Bayer | Beta Cephei |
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Bayer name | Bet Cep |
Flamsteed | 8 Cephei |
Flamsteed name | 8 Cep |
Distance | 210.08 |
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Distance ly | 685.28 |
last precise pa | 226 |
last precise sep | 0.172 |
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 | Grade | 3 | (1=Definitive, 9=Indet.) | |||
Equinox | 2000 | Last observation | 1998 |
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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coord_2000 | discov_num | comp | epoch | obs | pa | sep | mag_pri | mag_sec | spectr | notes | coord_arcsec_2000 |
21287+7034 | LAB 6 | Aa,Ab | 2007 | 62 | 226 | 0.2 | 3.20 | 6.60 | B2III | N D | 212839.58+703338.5 |