Arp 7

{{Short description| Spiral Galaxy in the constellation of Hydra }}

{{Infobox Galaxy

| name = ARP 7

| image = Arp 7 PanSTARRS1 i.r.g.jpg

|caption = Arp 7 by PanSTARRS

| credit= Halton Arp

| epoch = J2000

| type = SB(rs)bc {{cite web

| title=NASA/IPAC Extragalactic Database

| work=Results for ARP 007

| url=http://www.ned.ipac.caltech.edu/

| access-date=2015-11-25

| archive-url=https://web.archive.org/web/19971222113324/http://ned.ipac.caltech.edu/

| archive-date=1997-12-22

| url-status=dead

}}

| ra = {{RA|8|50|30.0}}{{cite book

| publisher=SIMBAD Astronomical Database

| title=Results for ARP 007

| url=http://simbad.u-strasbg.fr/simbad/

| access-date=2015-11-25}}

| dec = {{DEC|-16|37|00}}

| dist_ly = {{convert|5.9-83.7|Mpc|Mly|abbr=on|lk=on|order=flip}}

| z = 0.018356 ± 0.000027

(5503 ± 8 km/s)

| appmag_v = 12.40

| size_v = 57.1″ × 52.53″

| size = {{convert|1.6|kpc|ly|abbr=on|lk=on|order=flip}} ({{convert|23|kpc|ly|abbr=on|lk=on|order=flip}}?) (estimated){{efn|name=size}}

| constellation name = Hydra{{cite web

| first=Courtney

| last=Seligman

| title=Celestial Atlas: PCG Objects 24500–4999

| url=http://cseligman.com/text/atlas/pgc24a.htm

| access-date=2015-11-25}}

| notes =

| names = PGC 024836, APG 7

}}

{{Sky|08|50|30|-|16|37|00|130000000}}

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.{{cite web

| first=Halton

| last=Arp

| title=Atlas of Peculiar Galaxies

| date=1966

| work=Figure 1

| url=https://ned.ipac.caltech.edu/level5/Arp/Arp_figure1.html

| access-date=2015-11-25}} 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).