The dwarf galaxy with pockets of ionised gas, seen as blue
Observation data (J2000 epoch)
Right ascension
14h 24m 43.08s[1]
Declination
+44° 31′ 31.8″[1]
Redshift
0.000500[2]
Heliocentric radial velocity
150.0 ± 4.0 km/s[2]
Distance
9.10×10^6 ly (2.79 Mpc)h−1 0.73
Group or cluster
M94 Group
Apparent magnitude (V)
13.25
Absolute magnitude (V)
-14.19
Characteristics
Type
IAm
Mass
5×107M☉
Other designations
UGC 9240, MCG +08-26-030, PGC 51472[2]
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DDO 190 (or UGC 9240) is a dwarf irregular galaxy in the vicinity of the Milky Way, as it is relatively small and lacks clear structure. It is 9.10 million light-years (2.79 Mpc) away from Earth and lies out of the Local Group, determined by the tip of the red giant branch method.[3] The outskirts of the galaxy are harbouring older (reddish) stars, while the centre is crowded with younger (bluish) stars. Heated gas is observed at several places.[4] DDO 190 still experiences some active star formation. The galaxy is categorised as a Magellanic dwarf galaxy of morphological type Im. Its metallicity is [Fe/H] = −1.55 ± 0.12.[3]
DDO 190 is small, but not tiny: about 15,000 light years across—about 1/6 the size of our galaxy. It is also well outside the Local Group, which contains nearby galaxies (the Andromeda galaxy is less than 3 million light years distant from Earth, for comparison), and is instead thought to be part of the M94 galaxy group. But if true it is fairly isolated even from the others on its team; the nearest neighbor appears to be another dwarf galaxy, DDO 187, at a distance of 3 million light-years (0.92 Mpc).[4]
^ abBrown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ abc"DDO 190". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-02-22.
^ abBattinelli, P.; Demers, S. (2006). "The C star population of DDO 190" (PDF). Astronomy & Astrophysics. 447 (2). ESO: 473–480. Bibcode:2006A&A...447..473B. doi:10.1051/0004-6361:20052829. S2CID 59497374. Archived from the original (PDF) on 2014-11-10. Retrieved 2012-08-18. The HI mass of DDO 190, estimated at 5 × 107 solar masses by Stil & Israel (2002a) is normal for a galaxy of its luminosity.
^ ab"Galactic Island". NASA. 2012-08-17. Archived from the original on 2012-08-17. Retrieved 2012-08-18.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
DDO190 (or UGC 9240) is a dwarf irregular galaxy in the vicinity of the Milky Way, as it is relatively small and lacks clear structure. It is 9.10 million...
David Dunlap Observatory Catalogue, known as the DDO or A Catalogue of Dwarf Galaxies, is a catalogue of dwarf galaxies that was compiled by Sidney van...
S2CID 4324282. Battinelli, P.; S. Demers (2005-10-06). "The C star population of DDO190: 1. Introduction". Astronomy and Astrophysics. 447 (2). Astronomy & Astrophysics:...
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Development Policy Grant with a Catastrophe Deferred Drawdown Option (Cat DDO) (P167941)". Documents, The World Bank. Urban, Resilience, and Land Global...
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