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ARP 7
Arp 7 by PanSTARRS
Observation data (J2000 epoch)
Constellation	Hydra
Right ascension	8 50 30.0
Declination	−16° 37′ 00″
Redshift	0.018356 ± 0.000027 (5503 ± 8 km/s)
Distance	19–273 Mly (5.9–83.7 Mpc)
Apparent magnitude (V)	12.40
Characteristics
Type	SB(rs)bc
Size	5,200 ly (1.6 kpc) (75,000 ly (23 kpc)?) (estimated)
Apparent size (V)	57.1″ × 52.53″
Other designations
PGC 024836, APG 7

Arp 7 (PGC 24836) is a spiral galaxy in the constellation Hydra. Redshift-independent measurements of its distance vary widely, from 5.9 Mpc to 83.7 Mpc. Its morphological classification is SB(rs)bc, 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. 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

• List of largest galaxies

References

1. ^ Seligman, Courtney. "Celestial Atlas: PCG Objects 24500 - 24999". Retrieved 2015-11-25.
2. ^ SIMBAD Astronomical Database. Retrieved 2015-11-25. {{cite book}}: |work= ignored (help)
3. ^ "NASA/IPAC Extragalactic Database". Results for ARP 007. Archived from the original on 1997-12-22. Retrieved 2015-11-25.
4. Arp, Halton (1966). "Atlas of Peculiar Galaxies". Figure 1. Retrieved 2015-11-25.

Notes

1. Calculated from apparent size and distance:${\displaystyle 5.9-83.7Mpc*sin(57.1arcsec)=5,300-75,000ly}$

External links

• Full Arp Atlas
• Arp Atlas image of Arp 7
• Constellation Locator
• SIMBAD Astronomical Database
• NASA/IPAC Extragalactic Database

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• Barred spiral galaxies
• Arp objects
• Principal Galaxies Catalogue objects
• Peculiar galaxies
• Hydra (constellation)
• Spiral galaxy stubs