Delta Aurigae

Delta Aurigae
Delta Aurigae
Classificazionegigante arancione
Classe spettraleK0III C ~
Distanza dal Sole140 anni luce
CostellazioneAuriga
Redshift0,000027 ± 0,000003
Coordinate
(all'epoca J2000.0)
Ascensione retta05h 59m 31,6366s
Declinazione+54° 17′ 04,762″
Lat. galattica+14,6878°
Long. galattica158,9517°
Dati fisici
Raggio medio12 R
Massa
1,76 M
Acceleraz. di gravità in superficie2,45 logg
Temperatura
superficiale
  • 4786,3 K (media)
Luminosità
47 L
Metallicità71% del Sole
Età stimata1,3 milioni di anni
Dati osservativi
Magnitudine app.3,74
Magnitudine ass.0,57
Parallasse23,22 ± 0,91 mas
Moto proprioAR: 81.81 mas/anno
Dec: -132.98 mas/anno
Velocità radiale8,2 ± 0,9 km/s
Nomenclature alternative
GCRV 3717, IRC +50155, ROT 948, JP11 1288, SAO 25502, AG +54 517, GSC 03750-01042, LSPM J0559+5417, ASCC 247345, HD 40035, 2MASS J05593160+5417047, TD1 5635, BD +54 970, HIC 28358, N30 1275, TYC 3750-1042-1, CCDM J05595+5418A, HIP 28358, PLX 1367, UBV 6046, CSI +54 970 1, HR 2077, PMC 90-93 163, UBV M 11637, FK5 225, IDS 05512+5416 A, PPM 30177, USNO -B1.0 1442-00163574, GC 7521, IRAS 05554+5416, RAFGL 848, YZ 54 2366

Delta Aurigae (δ Aur / δ Aurigae) è una stella gigante arancione di magnitudine 3,74 situata nella costellazione dell'Auriga. Dista 140 anni luce dal sistema solare.

Osservazione

Si tratta di una stella situata nell'emisfero celeste boreale. La sua posizione è fortemente boreale e ciò comporta che la stella sia osservabile prevalentemente dall'emisfero nord, dove si presenta circumpolare anche da gran parte delle regioni temperate; dall'emisfero sud la sua visibilità è invece limitata alle regioni temperate inferiori e alla fascia tropicale. Essendo di magnitudine 3,7, la si può osservare anche dai piccoli centri urbani senza difficoltà, sebbene un cielo non eccessivamente inquinato sia maggiormente indicato per la sua individuazione.

Il periodo migliore per la sua osservazione nel cielo serale ricade nei mesi compresi fra fine ottobre e aprile; nell'emisfero nord è visibile anche per un periodo maggiore, grazie alla declinazione boreale della stella, mentre nell'emisfero sud può essere osservata limitatamente durante i mesi dell'estate australe.

Caratteristiche fisiche

La stella è una gigante arancione di classe spettrale K0III avente una massa un po' meno del doppio di quella del Sole ma con un raggio 12 volte più esteso. Possiede una magnitudine assoluta di 0,57 e la sua velocità radiale positiva indica che la stella si sta allontanando dal sistema solare.

Due stelle di magnitudine 10 e 11 sono compagne visuali di Delta Aurigae, una di queste è a sua volta doppia, ma l'osservazione del moto proprio nel corso degli anni mostra che non sono legate gravitazionalmente alla stella ma sono solo apparentemente vicine in cielo viste dalla Terra.

Voci correlate

Collegamenti esterni

  Portale Stelle: accedi alle voci di Wikipedia che trattano di stelle e costellazioni

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