Astronomy:Arp 7
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Short description: Spiral Galaxy in the constellation of Hydra
| ARP 7 | |
|---|---|
 Arp 7 by PanSTARRS | |
| Observation data (J2000 epoch) | |
| Constellation | Hydra[1] |
| Right ascension | 8h 50m 30.0s[2] |
| Declination | −16° 37′ 00″[2] |
| Redshift | 0.018356 ± 0.000027 (5503 ± 8 km/s)[3] |
| Distance | 19–273 Mly (5.9–83.7 Mpc)[3] |
| Apparent magnitude (V) | 12.40[3] |
| Characteristics | |
| Type | SB(rs)bc [3] |
| Size | 5,200 ly (1.6 kpc) (75,000 ly (23 kpc)?) (estimated)[lower-alpha 1][3] |
| Apparent size (V) | 57.1″ × 52.53″ [3] |
| Other designations | |
| PGC 024836,[3] APG 7[2] | |
Coordinates: 
08h 50m 30s, −16° 37′ 00″
Arp 7 (PGC 24836) is a spiral galaxy in the constellation Hydra.[1] Redshift-independent measurements of its distance vary widely, from 5.9 Mpc to 83.7 Mpc.[3] Its morphological classification is SB(rs)bc,[3] meaning it is a barred spiral galaxy with some ring-like structure.
Arp 7 was imaged by Halton Arp and included in his Atlas of Peculiar Galaxies under the category of 'split arm' galaxies.[4] Five other galaxies are also included in this section of the atlas: Arp 8 (NGC 497), Arp 9 (NGC 2523), Arp 10 (UGC 1775), Arp 11 (UGC 717), and Arp 12 (NGC 2608).
See also
References
- ↑ 1.0 1.1 Seligman, Courtney. "Celestial Atlas: PCG Objects 24500 - 24999". http://cseligman.com/text/atlas/pgc24a.htm.
- ↑ 2.0 2.1 2.2 SIMBAD Astronomical Database. http://simbad.u-strasbg.fr/simbad/. Retrieved 2015-11-25.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 "NASA/IPAC Extragalactic Database". Results for ARP 007. http://www.ned.ipac.caltech.edu/.
- ↑ Arp, Halton (1966). "Atlas of Peculiar Galaxies". Figure 1. https://ned.ipac.caltech.edu/level5/Arp/Arp_figure1.html.
Notes
- ↑ Calculated from apparent size and distance:[math]\displaystyle{ 5.9-83.7 Mpc*sin(57.1 arcsec) = 5,300 - 75,000 ly }[/math]
External links
- Full Arp Atlas
- Arp Atlas image of Arp 7
- Constellation Locator
- SIMBAD Astronomical Database
- NASA/IPAC Extragalactic Database
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