Beta Ursae Majoris


Merak , Merach
Nimen alkuperä ?
Bayerin designaatio Beta Ursae Majoris (β UMa / β Ursae Majoris)
Flamsteedin designaatio 48 Ursae Majoris
HD-designaatio HD 95418
Muut designaatiot HR 4295, HD 95418, BD+57 1302, FK5 416, SAO 27876, GC 15145
Fyysiset ominaisuudet
Näennäinen kirkkaus +2,34 mv
Absoluuttinen kirkkaus 0,41 Mv
Valovoima 69 aurinkoa
Spektriluokka A1V
Väri-indeksi B-V -0,02, U-B 0,01
Lämpötila 9800 K K
Massa 3 Mo M
Säde 2 R
Muuttujatyyppi luultavasti
Pyörimisnopeus ~39 km/s.
Astrometriset ominaisuudet
Tähdistö Iso Karhu (Ursa Major)
Rektaskensio (J2000) 11h 01m 50.5s
Deklinaatio (J2000) +56° 22' 57"
Etäisyys 79,4 valovuotta (24,3 parsekia)
Parallaksi 41,07 ± 0,60 mas
Säteisnopeus -12 km/s
Ominaisliike RA: 81,66
dekl.: 33,74 mas/v
Näkyy leveysasteiden 90° N
ja 34° S välillä.

Beta Ursae Majoris (β UMa / β Ursae Majoris) eli Merak on tähti Ison Karhun tähtikuviossa. Se kuuluu kuvion tunnetuimpaan osaan Otavaan. Se sijaitsee Otavan oikeassa alareunassa, "kattilan" alakulmassa. Merak näyttää suuntaa Pohjantähteen yhdessä sen yläpuolella olevan Dubhen kanssa.

Merak

Merakille on ympärillään Vegan ja Fomalhautin pölykiekkoja muistuttava kiekko, joka muistuttaa Saturnuksen rengasta, ja jonka lämpötila on muutama sata kelviniä.

Aiheesta muualla


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