Omicron Librae

Omicron Librae
Omicron Librae
Classificazionebianco-gialla nella sequenza principale
Classe spettraleF2V C ~
Distanza dal Sole178 anni luce
CostellazioneBilancia
Redshift5,00 ± 5,00
Coordinate
(all'epoca J2000.0)
Ascensione retta15h 21m 01,3769s
Declinazione-15° 32′ 54,030″
Lat. galattica+33,9834°
Long. galattica347,8115°
Dati fisici
Raggio medio1,91 R
Massa
1,55 M
Acceleraz. di gravità in superficie4,07 logg
Temperatura
superficiale
  • 6918,31 K (media)
Dati osservativi
Magnitudine app.6,15
Magnitudine ass.2,46
Parallasse18,31 ± 1,04 mas
Moto proprioAR: 27,14 ± 1,06 mas/anno
Dec: 18,15 ± 0,63 mas/anno
Velocità radiale5 ± 5 km/s
Nomenclature alternative
2MASS J15210137-1532539, TYC 6171-196-1, GSC 06171-00196, N30 3452, UBV M 20710, BD -15 4083, HD 136407, PPM 230112, uvby98 100136407, CCDM J15210-1533A, HIC 75118, ROT 7350, YZ 105 5635, CSI -15 4083 1, HIP 75118, SAO 159191, GC 20628, HR 5703, GCRV 8876, IDS 15154-1511 A, TD1 18148

Omicron Librae (ο Lib / ο Librae) è una stella bianco-gialla nella sequenza principale di magnitudine 6,15 situata nella costellazione della Bilancia. Dista 178 anni luce dal sistema solare.

Osservazione

Si tratta di una stella situata nell'emisfero celeste australe; grazie alla sua posizione non fortemente australe, può essere osservata dalla gran parte delle regioni della Terra, sebbene gli osservatori dell'emisfero sud siano più avvantaggiati. Nei pressi dell'Antartide appare circumpolare, mentre resta sempre invisibile solo in prossimità del circolo polare artico. Essendo di magnitudine pari a 6,2, non è osservabile ad occhio nudo; per poterla scorgere è sufficiente comunque anche un binocolo di piccole dimensioni, a patto di avere a disposizione un cielo buio.

Il periodo migliore per la sua osservazione nel cielo serale ricade nei mesi compresi fra maggio e settembre; 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 bianco-gialla nella sequenza principale; possiede una magnitudine assoluta di 2,46 e la sua velocità radiale positiva indica che la stella si sta allontanando dal sistema solare.

Sistema stellare

Omicron Librae è un sistema stellare formato da due componenti. La componente principale A è una stella di magnitudine 6,15. La componente B è di magnitudine 8,4, separata da 44,4 secondi d'arco da A e con angolo di posizione di 350 gradi.

Voci correlate

Collegamenti esterni

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

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