Astronomy:NGC 7840
From HandWiki
| NGC 7840 | |
|---|---|
 SDSS image of NGC 7840 | |
| Observation data (J2000 epoch) | |
| Constellation | Pisces[1][2] |
| Right ascension | 00h 07m 08.79s[3] |
| Declination | +08° 22′ 59.6″[3] |
| Apparent magnitude (V) | 15[1] |
| Characteristics | |
| Type | S?[1] |
| Apparent size (V) | 0.676′ × 0.457′ |
| Other designations | |
| PGC 1345780[3] | |
NGC 7840, the last numerical entry in the New General Catalogue, is an unbarred spiral galaxy in the constellation Pisces.[1] Its velocity with respect to the cosmic microwave background is 10906 ± 49 km/s, which corresponds to a Hubble distance of 160.85 ± 11.30 Mpc (~524 million light-years), and its diameter is about 162,000 light-years.[4] It was discovered by German astronomer Albert Marth on 29 November 1864.[1]
For observing from Earth's surface, it has a magnitude of 15.5 in the early 21st century.[5] One observing guide recommended a telescope with a least 300mm aperture for observations.[5]
See also
- Spiral galaxy
- Unbarred spiral galaxy
- List of NGC objects (7000–7840)
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Celestial Atlas, "NGC Object 7840", Courtney Seligman, March 2010 (accessed 2010-10-27)
- ↑ WikiSky, "NGC 7840" (accessed 2010-10-17)
- ↑ 3.0 3.1 3.2 "Search specification: NGC 7840". HyperLeda. Université Claude Bernard Lyon 1. http://leda.univ-lyon1.fr/ledacat.cgi?o=NGC%207840. Retrieved 2021-02-12.
- ↑ "NASA/IPAC Extragalactic Database". Results for NGC 7840. http://ned.ipac.caltech.edu/byname?objname=NGC+7840.
- ↑ 5.0 5.1 Bakich, Michael E. (2010-07-10) (in en). 1,001 Celestial Wonders to See Before You Die: The Best Sky Objects for Star Gazers. Springer Science & Business Media. ISBN 9781441917775. https://books.google.com/books?id=qEhpS7d5ZdAC&dq=NGC+7840&pg=PA345.
External links
- NGC 7840 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
 |  |
