NGC 6998
| Galaxy NGC 6998 |
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|---|---|
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| AladinLite | |
| Constellation | microscope |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 21 h 01 m 37.7 s |
| declination | -28 ° 01 ′ 55 ″ |
| Appearance | |
| Morphological type | E0; Radio galaxy |
| Brightness (visual) | 14.2 mag |
| Brightness (B-band) | 15.2 mag |
| Angular expansion | 0.6 ′ × 0.6 ′ |
| Surface brightness | 13.2 mag / arcmin² |
| Physical data | |
| Affiliation | Abell 3733 |
| Redshift | 0.039661 +/- 0.000028 |
| Radial velocity | 11890 +/- 8 km / s |
|
Stroke distance v rad / H 0 |
(534 ± 38) · 10 6 ly (163.7 ± 11.5) Mpc |
| history | |
| discovery | Albert Marth |
| Discovery date | October 19, 1864 |
| Catalog names | |
| NGC 6998 • PGC 65925 • ESO 464-14 • 2MASX J21013771-2801543 • SGC 205838-2813.7 • | |
NGC 6998 is an elliptical galaxy of Hubble type E0? in the constellation microscope in the southern sky . It is around 534 million light years away from the Milky Way and has a diameter of around 100,000 light years . The object has been classified as a radio galaxy and is a member of the so-called NGC-6999 group .
The object was discovered on October 19, 1864 by Albert Marth .