Mirfak
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Mirfak se ligging (in die rooi sirkel). | ||||
Sterrebeeld | Perseus | |||
Bayer-naam | Alpha Persei | |||
Spektraaltipe | F5 Ib[1][2] | |||
Soort | Superreus | |||
Waarnemingsdata (Epog J2000) | ||||
Regte klimming | 03h 24m 19.37009s[3] | |||
Deklinasie | +49° 51′ 40.2455″[3] | |||
Skynmagnitude (m) | 1,806[1] | |||
Absolute magnitude (M) | -5,1[2] | |||
B-V-kleurindeks | +0,483[4] | |||
U-B-kleurindeks | +0,38[4] | |||
Besonderhede | ||||
Massa (M☉) | 8,5 ± 0,3[1] | |||
Radius (R☉) | 68 ± 3[5] | |||
Ouderdom (jaar) | 41 miljoen[1] | |||
Temperatuur (K) | 6 350 ± 100[1] | |||
Afstand (ligjaar) | 510 | |||
Rotasiespoed (km/s) | 20[6] | |||
Metaalinhoud [Fe/H] | -0,02[7] | |||
Ander name | ||||
Mirphak, Marfak, Algeneb, Algenib, α Persei, 33 Persei, BD+49 917, CCDM J03243+4951A, FK5 120, GC 4041, HD 20902, HIP 15863, HR 1017, IDS 03171+4930 A, PPM 46127, SAO 38787, WDS J03243+4952A | ||||
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Mirfak (ook bekend as Alpha Persei of α Per) is die helderste ster in die noordelike sterrebeeld Perseus, ook helderder as die sterrebeeld se bekendste ster, Algol. Mirfak het ’n skynbare magnitude van 1,8[8] en is ’n sirkumpolêre ster by middenoordelike breedtegrade.
Die ster lê in die middel van ’n sterreswerm: die Alpha Persei-swerm, wat na die ster genoem is, of Melotte 20, wat maklik met ’n verkyker gesien kan word en baie van die sterrebeeld se dowwer sterre insluit.[9] Volgens parallaksmetings is Mirfak sowat 510 ligjare van die Son af.[3]
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