Alrescha

Alrescha
Más jelölésekalfa Psc, 113 Psc, BD+02 317, GSC 40 1338, HD 12446, HIP 9487, HR 595, PPM 145227, SAO 110291,STF 202, ADS 1615, CCDM 02020+0246, IDS 01569+0217, WDS 02020+0246, NSV 705[1]
Megfigyelési adatok
CsillagképHalak csillagkép
EpochaJ2000,0
Rektaszcenzió02h 02m 02,81972s[1]
Deklináció+02° 45′ 49,5410″[1]
Távolság139,1[2] fé,
42,6[2] pc
Látszólagos fényesség3,82[2]
Abszolút fényesség0,671[2]
Színkép típusakA0hA7Sr+kA2hF2mF2(IV)[3]
Pályaadatok
Évi parallaxis21,66 ezred ívmásodperc[1]
Radiális sebesség7,50[1]
Sajátmozgás
rektaszcenzióban0,03245"/év[1]
deklinációban0,00004"/év[1]
Fizikai adatok
Tömeg4,6×1030 kg,
2,3 M☉
Luminozitás44,8[2] L☉
Forgási adatok
Radiális forgási sebesség 81 km/s

Az Alrescha (Alrisha, Alfa Piscium) egy csillag a Halak csillagképben. Látszólagos fényessége 3,82, távolsága a Naprendszertől 139 fényév. Közeli kettőscsillag. Egymás körüli számított keringési idejük 930 év. A fényesebb csillag magnitúdója 4,2, spektrális típusa A0p, a másiké 5,2, A3m spektrális típusú. Tömegük 2,3 és 1,8 naptömegnek felel meg.

Az Alrescha név (néha Alrisha alakban) الرشآء al-rišā’ arab szóból származik, aminek jelentése: kötél.

Jegyzetek

  1. ↑ a b c d e f g SIMBAD lekérdezés: Alpha Psc
  2. ↑ a b c d e ESA 1997, The Hipparcos and Tycho Catalogues (ESA SP-1200) (Noordwijk: ESA)
  3. ↑ The late A-type stars: refined MK classification, confrontation with Stroemgren photometry and the effects of rotation, SIMBAD

Források

  • Astronomy Encyclopedia - A comprehensive & authoritative A-Z guide to the Universe, 2002, p. 11

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