NGC 7840 explained
| NGC 7840 |
| Epoch: | J2000 |
| Constellation Name: | Pisces[1] [2] |
| Ra: | [3] |
| Type: | S? |
| Appmag V: | 15 |
| Size V: | 0.676′ × 0.457′ |
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.
See also
Notes and References
- Celestial Atlas, "NGC Object 7840", Courtney Seligman, March 2010 (accessed 2010-10-27)
- WikiSky, "NGC 7840" (accessed 2010-10-17)
- Web site: Search specification: NGC 7840. HyperLeda. Université Claude Bernard Lyon 1. 2021-02-12.
- Web site: NASA/IPAC Extragalactic Database . Results for NGC 7840 . 3 August 2024.
- Book: Bakich, Michael E.. 1,001 Celestial Wonders to See Before You Die: The Best Sky Objects for Star Gazers. 2010-07-10. Springer Science & Business Media. 9781441917775. en.
