50 Cancri

50 Cancri
50 Cancri
ClassificazioneStella bianca di sequenza principale
Classe spettraleA1V C ~
Distanza dal Sole173 anni luce
CostellazioneCancro
Redshift23,30 ± 2,00
Coordinate
(all'epoca J2000.0)
Ascensione retta08h 46m 56,0181s
Declinazione+12° 06′ 35,828″
Lat. galattica+31,0548°
Long. galattica214,8436°
Dati fisici
Raggio medio1,66 R⊙
Massa
Acceleraz. di gravità in superficie4,27 logg
Temperatura
superficiale
  • 8511,38 K (media)
Luminosità
11 L⊙
Dati osservativi
Magnitudine app.+5,89
Magnitudine ass.+2,23
Parallasse16,38 ± 1,16 mas
Moto proprioAR: -64,46 mas/anno
Dec: -51,69 mas/anno
Velocità radiale23,3 ± 2 km/s
Nomenclature alternative
GSC 00813-01445, 2MASS J08465603+1206358, UBV 8499, AG +12 1070, HD 74873, PPM 125732, UBV M 14694, BD +12 1904, HIC 43121, SAO 98117, uvby98 100074873, GC 12104, HIP 43121, YPAC 468, GCRV 5790, HR 3481, TD1 13048, YZ 12 3535, IRAS F08441+1217, TYC 813-1445-1
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50 Cancri è una stella bianca nella sequenza principale di magnitudine 5,89 situata nella costellazione del Cancro. Dista 173 anni luce dal sistema solare[2].

Osservazione

Si tratta di una stella situata nell'emisfero celeste boreale; grazie alla sua posizione non fortemente boreale, può essere osservata dalla gran parte delle regioni della Terra, sebbene gli osservatori dell'emisfero nord siano più avvantaggiati. Nei pressi del circolo polare artico appare circumpolare, mentre resta sempre invisibile solo in prossimità dell'Antartide. La sua magnitudine pari a 5,9 la pone al limite della visibilità ad occhio nudo, pertanto per essere osservata senza l'ausilio di strumenti occorre un cielo limpido e possibilmente senza Luna.

Il periodo migliore per la sua osservazione nel cielo serale ricade nei mesi compresi fra dicembre e maggio; da entrambi gli emisferi il periodo di visibilità rimane indicativamente lo stesso, grazie alla posizione della stella non lontana dall'equatore celeste.

Caratteristiche fisiche

La stella è una bianca di sequenza principale; possiede una magnitudine assoluta di 2,2 e la sua velocità radiale positiva indica che la stella si sta allontanando dal sistema solare.

Occultazioni

Per la sua posizione prossima all'eclittica, è talvolta soggetta ad occultazioni da parte della Luna e, più raramente, dei pianeti, generalmente quelli interni.

Le ultime occultazioni lunari avvennero riswpettivamente il 3 dicembre 2012[3][4] e il 13 marzo 2014[5].

Note

  1. ^ J. Zorec, F. Royer, Rotational velocities of A-type stars. IV. Evolution of rotational velocities, in Astronomy and Astrophysics, vol. 537, A120, gennaio 2012), p. 22, DOI:10.1051/0004-6361/201117691.
  2. ^ Extended Hipparcos Compilation (XHIP) (Anderson+, 2012)
  3. ^ Luna occulta 50 Cancri (2012-12-03 22:35 CET)), su oato.inaf.it (archiviato dall'url originale l'11 marzo 2014).
  4. ^ Occultazione: Luna-50 Cnc (JPG), su skylive.it. URL consultato il 3 dicembre 2012 (archiviato dall'url originale il 17 aprile 2012).
  5. ^ Luna occulta 50 Cancri (2014-03-13 01:53 CET)), su oato.inaf.it (archiviato dall'url originale l'11 marzo 2014).

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