HD 166

HD 166
HD 166
Classificazionenana arancione nella sequenza principale
Classe spettraleK0Ve ~ ~
Distanza dal Sole45 anni luce
CostellazioneAndromeda
Redshift-0,000027 ± 0,000007
Coordinate
(all'epoca J2000.0)
Ascensione retta00h 06m 36,7839s
Declinazione+29° 01′ 17,406″
Lat. galattica-32,8326°
Long. galattica111,2636°
Dati fisici
Raggio medio0,85 R
Massa
0,98 M
Acceleraz. di gravità in superficie4,57 logg
Temperatura
superficiale
  • 5363 K (media)
Metallicità112% del Sole
Dati osservativi
Magnitudine app.6,13
Magnitudine ass.5,45
Parallasse72,98 ± 0,75 mas
Moto proprioAR: 379,94 ± 0,71 mas/anno
Dec: -178,35 ± 0,48 mas/anno
Velocità radiale-8,2 ± 2 km/s
Nomenclature alternative
V439 And, EUVE J0006+29.0, IRAS 00040+2844, SAO 73743, ADS 69 A, GC 95, LSPM J0006+2901, AG +28 4, GCRV 51, LTT 10023, SPOCS 4, ASCC 647404, 2MASS J00063674+2901175, TYC 1735-927-1, BD +28 4704, GJ 5, N30 12, UBV 29, CCDM J00065+2900A, GSC 01735-00927, NLTT 235, UBV M 7136, Ci 20 9, GSC 01735-02532, NSV 33, USNO -B1.0 1190-00001748, CSI +28 4704 1, HD 166, PLX 9, USNO -A2.0 1125-00043457, 1E 0004.0+2844, HIC 544, PPM 89410, uvby98 100000166, 2E 15, HIP 544, RBS 15, YZ 28 3, 2E 0004.0+2844, HR 8, RX J0006.6+2901, [B10] 6, 1ES 0004+28.7, IDS 00014+2829 A, 1RXS J000636.8+290112, [ZEH2003] RX J0006.6+2901 1

HD 166, nota anche come V439 And nella nomenclatura delle stelle variabili, è una stella nana arancione nella sequenza principale di magnitudine 6,13 situata nella costellazione di Andromeda. Dista 45 anni luce dal sistema solare.

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. Essendo di magnitudine pari a 6,1, 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 settembre e febbraio; nell'emisfero nord è visibile anche per un periodo maggiore, grazie alla declinazione boreale della stella, mentre nell'emisfero sud può essere osservata solo durante i mesi della tarda primavera e inizio estate australi.

Caratteristiche fisiche

La stella è una nana arancione nella sequenza principale; possiede una magnitudine assoluta di 5,45 e la sua velocità radiale negativa indica che la stella si sta avvicinando al sistema solare.

Voci correlate

Collegamenti esterni

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

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