Coord 2000 | 02537+3820 | Discov num | BU 524 | Comp | AB | Coord arcsec 2000 | 02 53 42.58 +38 20 15.6 | ||||
Date first | 1878 | Date last | 2009 | Obs | 223 | ||||||
Pa first | 6 | Pa last | 318.8 | P.A. Now (θ) | 248° | ||||||
Sep first | 0.3 | Sep last | 0.225 | Sep. Now (ρ) | 0.169" | ||||||
Mag pri | 5.79 | Mag sec | 6.80 | delta mag (ΔM) | 1.01 | Spectral class | F4IV (yellow-white) | ||||
Pri motion ra | +050 | Sec motion ra | |||||||||
Pri motion dec | -078 | Sec motion dec | |||||||||
Notes | N O (See Notes, Orbital solution) |
Show | name | SAO | coord | wds_name | last | obs | pa | sep | mag1 | mag2 | d_mag | orb | current |
Show | 55975 | 02 53 43 +38 20 16 | BU 524 AB | 2009 | 223 | 319 | 0.2 | 5.79 | 6.80 | 1.01 | Y | <=== | |
Show | 20 Per | 55975 | 02 53 43 +38 20 16 | STF 318 AB,C | 2016 | 43 | 237 | 13.9 | 5.39 | 9.68 | 4.29 | ||
Show | 55975 | 02 53 43 +38 20 16 | STF 318 AB,D | 2002 | 6 | 40 | 58.1 | 5.39 | 12.60 | 7.21 |
Var name | NSV977 Per | Constellation | Perseus | SAO | 55975 | HIP | 13490 | ||||
Tycho2 | 2846-01428-1 | Gaia DR2 | 143119137916819456 | HD | 17904 | HR | 855 | ||||
GC | 3459 | ADS | 2200 | BD | BD+37 655 | Flamsteed | 20 Persei | ||||
Flamsteed name | 20 Per | Distance | 70.67 | Distance ly | 230.53 |
Period (P) | 11553.9d (31.63y) | ± 8.7 | Periastron (T) | 50255m (1996.471y) | ± 12 | Semi-major axis (a) | 0.2224a | ± 0.0011 |
Eccentricity (e) | 0.756 | ± 0.0023 | Inclination (i) | 120.48° | ± 0.2 | Longitude of periastron (ω) | 265.54° | ± 0.11 |
Node (Ω) | 26.62° | ± 0.24 | Notes | n | Reference | Mut2010b | ||
Equinox | 2000 | Last observation | 2008 | Grade | 2 | (1=Definitive, 9=Indet.) |
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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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