NGC 5557

NGC 5557
Galassia ellittica
La galassia “NGC 5557” (SDSS DR14)
Scoperta
ScopritoreWilliam Herschel
Data1785
Dati osservativi
(epoca J2000)
CostellazioneBoote
Ascensione retta14h 18m 25,7s
Declinazione+36° 29′ 37″
Distanza160 milioni a.l.
(49 milioni pc)
Magnitudine apparente (V)11,1
Dimensione apparente (V)2,3' x 1,9'
Caratteristiche fisiche
TipoGalassia ellittica
ClasseE3
Altre designazioni
UGC 9161; GC 3843
Mappa di localizzazione
NGC 5557
Categoria di galassie ellittiche

NGC 5557 è una galassia nella costellazione del Boote.

È un oggetto sfuggente, individuabile 3 gradi a SW della stella γ Bootis, dove si presenta insieme ad un gruppetto di galassie più deboli. Si tratta di una galassia ellittica di medie dimensioni, individuabile solo con un telescopio newtoniano, nel quale si mostra come una chiazza leggermente ellissoidale disposta in senso NE-SW, con un nucleo molto luminoso e predominante. Dista dalla Via Lattea 160 milioni di anni-luce.

Bibliografia

  • Catalogo NGC/IC online, su ngcicproject.org. URL consultato il 7 settembre 2009 (archiviato dall'url originale il 28 maggio 2009).
  • Tirion, Rappaport, Lovi, Uranometria 2000.0, William-Bell inc. ISBN 0-943396-14-X

Voci correlate

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