Dwingeloo 1
| Dwingeloo 1 | |
|---|---|
.png)
WISE infrared image of Dwingeloo 1
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| Observation data (J2000 epoch) | |
| Constellation | Cassiopeia |
| Right ascension | 02h 56m 51.9s |
| Declination | +58° 54′ 42″ |
| Redshift | 0.000368 |
| Helio radial velocity | 110.3 ± 0.4 km/s |
| Galactocentric velocity | 257 km/s |
| Distance | ~ 10 Mly (~3 Mpc) |
| Group or cluster | IC 342/Maffei |
| Apparent magnitude (V) | 13.08 (V-band) |
| Characteristics | |
| Type | SB(s)cd |
| Apparent size (V) | 4′.2 × 0′.34 |
| Other designations | |
| LEDA 100170, CAS 2 | |
Dwingeloo 1 is a barred spiral galaxy about 10 million light-years away from the Earth, in the constellation Cassiopeia. It lies in the Zone of Avoidance and is heavily obscured by the Milky Way. The size and mass of Dwingeloo 1 are comparable to those of Triangulum Galaxy.
Dwingeloo 1 has two smaller satellite galaxies — Dwingeloo 2 and MB 3 — and is a member of the IC 342/Maffei Group of galaxies.
The Dwingeloo 1 galaxy was discovered in 1994 by the Dwingeloo Obscured Galaxy Survey (DOGS), which searched for neutral hydrogen (HI) radio emissions at the wavelength of 21 cm from objects in the Zone of Avoidance. In this zone gas and dust in the disk of the Milky Way galaxy block the light from the galaxies lying behind it.
The galaxy was, however, first noted as an unremarkable feature on Palomar Sky Survey plates earlier in the same year, but was not recognized as such. It was also independently discovered a few weeks later by another team of astronomers working with Effelsberg 100-m Radio Telescope.
After the discovery, Dwingeloo 1 was classified as a barred spiral galaxy. The distance to it was found to be approximately 3 Megaparsecs. In its overall size and mass, the galaxy is comparable to Triangulum Galaxy.
Dwingeloo 1 was eventually named after the 25m radio telescope in the Netherlands that was used in the DOGS survey and first detected it.
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