Dragonfly 44
| Dragonfly 44 | |
|---|---|
Coma-Cluster
|
|
| Observation data | |
| Constellation | Coma Berenices |
| Right ascension | 13h 00m 58.0s |
| Declination | +26° 58′ 35″ |
| Redshift | ~0.023 |
| Helio radial velocity | 6280 ± 120 km/s |
| Distance | ~100 Mpc (~330 Mly) |
| Group or cluster | Coma Cluster |
| Apparent magnitude (V) | 21 mag; or 19.4 mag |
| Apparent magnitude (B) | 22 |
| Absolute magnitude (V) | -16.1 mag |
| Characteristics | |
| Mass | ~1.0×1012M☉ |
| Size | 70,000 |
| Apparent size (V) | 10 x 35 arcsec |
| Other designations | |
| SDSS J130057.98+265839.6, SDSS J130058.17+265836.1, SDSS J130058.21+265829.3 | |
Dragonfly 44 is an ultra diffuse galaxy in the Coma Cluster. Observations of the rotational speed suggest a mass of about one trillion solar masses, about the same as the mass of the Milky Way. This is also consistent with about 90 globular clusters observed around Dragonfly 44. However, the galaxy emits only 1% of the light emitted by the Milky Way. The galaxy was discovered with the Dragonfly Telephoto Array.
In August 2016, astronomers reported that this galaxy might be made almost entirely of dark matter.
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Wikipedia