Gruppo di ESO 154-10

Gruppo di ESO 154-10 Gruppo di galassie
Dati osservativi (epoca J2000.0)
Costellazione	Orologio
Ascensione retta	02^h 41^m 48.3^s
Declinazione	-55° 28′ 21″
Distanza	255 milioni di a.l. ^[1] (78,2 Mpc)
Caratteristiche fisiche
Tipo	Gruppo di galassie
Mappa di localizzazione

Categoria di gruppi di galassie

Il Gruppo di ESO 154-10 è costituito da un terzetto di galassie situate nella costellazione dell'Orologio. La distanza media tra il centro di massa di questo gruppo e la nostra Via Lattea è di circa 255 milioni di anni luce (78,2 Mpc).^[2]

Membri

Le tre galassie componenti il gruppo, indicate nell'articolo di Garcia del 1993, sono indicate nella tabella seguente.^[2]

**Membri del gruppo di ESO 154-10**
Nome	Classificazione	Tipo	RA (J2000.0)	DEC (J2000.0)	Velocità radiale (km/s)	Magnitudine apparente	Distanza (Mpc)	Dimensioni (kal)
NGC 1031	SB(r)a?	Spirale barrata	02^h 36^m 38.7^s	-54° 51′ 35″	5604 ± 23	12,5^[3]	78,3 ± 5,7	141
NGC 1136	SB(r)a?	Spirale barrata	02^h 50^m 53.7^s	-54° 58′ 33″	5610 ± 9	13,0^[4]	78,4 ± 5,7	104
ESO 154-10	(R')SB(r)a?	Spirale barrata	02^h 45^m 08.7^s	-55° 44′ 26″	5586 ± 24	13,37	78,0 ± 5,7	192

Il sito DeepskyLog^[5] permette di trovare agevolmente le costellazioni in cui si trovano le galassie; in alternativa si possono utilizzare le coordinate delle galassie per individuarle.^[6] Se non altrimenti indicato, le coordinate sono quelle fornite dal sito NASA/IPAC (National Aeronautics and Space Administration / Infrared Processing and Analysis Center).

Note

^ Riferito al centro di massa del gruppo.
^ ^a ^b A.M. Garcia, General study of group membership. II - Determination of nearby groups, in Astronomy and Astrophysics Supplement Series, 100 #1, luglio 1993, pp. 47-90, Bibcode:1993A&AS..100...47G.
^ (FR) Les données de «Revised NGC and IC Catalog by Wolfgang Steinicke», NGC 1000 à 1099, su astrovalleyfield.ca. URL consultato il 10 ottobre 2024.
^ (FR) Les données de «Revised NGC and IC Catalog by Wolfgang Steinicke», NGC 1100 à 1199, su astrovalleyfield.ca. URL consultato il 20 ottobre 2024.
^ DeepskyLog, su deepskylog.org.
^ Finding the constellation which contains given sky coordinates, su djm.cc.

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