DDO 190
Coordinates: 
14h 24m 43.08s, +44° 31′ 31.8″
14h 24m 43.08s, +44° 31′ 31.8″| DDO 190 | |
|---|---|
 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 | 9.10×106 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 | 5×107 M☉ |
| Other designations | |
| UGC 9240, MCG +08-26-030, PGC 51472[2] | |
DDO 190 (or UGC 9240) is a
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
DDO 187, at a distance of 3 million light-years (0.92 Mpc).[4]
History
The galaxy was discovered by the Canadian astronomer Sidney van den Bergh in 1959 and put in the DDO catalogue.[4]
References
- ^ .
- ^ a b c "DDO 190". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-02-22.
- ^ 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.
- ^ a b c "Galactic Island". NASA. 2012-08-17. Archived from the original on 2012-08-17. Retrieved 2012-08-18.
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