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55 Eridani

55 Eridani
Observationsdata
Epok: J2000.0
StjärnbildEridanus
Rektascension04t 43m 34,75s
Deklination-08° 47′ 39,51″[1]
Skenbar magnitud ()6,82 (0,03) (V)[2]
Stjärntyp
SpektraltypF4IIIp(Sr)[3]
B–V0,645±0,007[4]
VariabeltypPulserande variabel av typen snabbt pulserande Ap-stjärna (roAp:)[2]
Astrometri
Radialhastighet ()39,80±4,3 km/s
Egenrörelse (µ)RA: 31,63±2,45 mas/år
Dek.: -26,01±1,90 mas/år
Parallax ()1,53±3,05 mas
Avstånd2131,79[3]  (653,59[3] pc)
Absolut magnitud ()-3,10[3]
Detaljer
Radie39,16[3] R
Temperatur5 755[3] K
Andra beteckningar
CCDM J04436-0848AB[5], ADS 3409 AB[5], HIC 21986[5], HIP 21986[5], IRAS 04411-0853[5], IRAS F04411-0853[5], PPM 187259[5], RBS 578[5], 1RXS J044334.6-084744[5], UBV 4539[5], UBV 4541[5], uvby98 100030021[5], WDS J04436-0848AB[5], YZ 98 1204[5], 55 Eri, IDS 04388-0859 AB[5] och UBV M 10299[5]

55 Eridani, eller DW Eridani, är en pulserande variabel av typen snabbt pulserande Ap-stjärna (roAp:)[2] i stjärnbilden Eridanus.

Stjärnan har visuell magnitud +6,82 och varierar i amplitud med 0,03 magnituder utan någon fastställd periodicitet.[2] Den befinner sig på ett avstånd av ungefär 2150 ljusår.[3]

  1. ^ ”Basic data: V* 55 Eri – Double or multiple star” (på engelska). Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=55+Eri&submit=SIMBAD+search. Läst 15 juni 2020. 
  2. ^ [a b c d] ”DW Eri” (på engelska). The International Variable Star Index. AAVSO – American Association of Variable Star Observers. http://www.aavso.org/vsx/index.php?view=detail.top&oid=14126. Läst 15 juni 2020. 
  3. ^ [a b c d e f g] ”55 Eridani” (på engelska). Universe Guide. https://www.universeguide.com/star/55eridani. Läst 15 juni 2020. 
  4. ^ van Leeuwen (2007). ”Hipparcos, the New Reduction” (på engelska). http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&HIP=21986. Läst 15 juni 2020. 
  5. ^ [a b c d e f g h i j k l m n o p] SIMBAD Astronomical Database.[källa från Wikidata]
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55 Eridani
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