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NGC 2573

{{short description|Galaxy in the constellation Octans}}

{{Infobox Galaxy

| name = NGC 2573

| image = NGC 2573 DSS.jpg

| image_size = 300px

| caption = NGC 2573

| credit =

| epoch = J2000.0

| type = SAB(s)cd:

| ra = {{RA|01|41|38.0019}}

| dec = {{DEC|-89|20|04.2723}}

| dist_ly = {{convert|25.8|Mpc|Mly}}

| z = 0.008102{{±|0.000017}}

| size = {{convert|23,860|pc|ly}}

| h_radial_v = {{val|2429|5|ul=km/s|fmt=commas}}

| appmag_b = 14.15{{±|0.09}}

| appmag_v = 13.25{{±|0.09}}

| absmag_v = −19.30{{±|0.67}}

| size_v = {{nowrap|0.85′ × 0.34′}}

| constellation name = Octans

| mass = {{val|3.229e11}}

| notes = Closest NGC object to the south celestial pole.

| names = Polarissima Australis,{{odlist|NGC = 2573|PGC = 6249|ESO = 1-1}}

}}

NGC 2573, also known as Polarissima Australis, is a barred spiral galaxy located in the constellation Octans. It has an apparent magnitude of 13.25, making it readily visible in medium-sized telescopes, but not to the naked eye. The object is located relatively far at a distance of 84 million light years and it is currently receding with a heliocentric radial velocity of {{val|2495|ul=km/s}}. Using a redshift of z = 0.08102 yields a greater distance of 109 million light years.

The galaxy was discovered on March 29th, 1837 by English astronomer John Herschel. It is the closest NGC object to the south celestial pole, hence the nickname "Polarissima Australis".

In the De Vaucouleurs system, NGC 2573 has a morphological classification of SAB(s)cd:, indicating that it is a weakly-barred spiral galaxy with loosely bound spiral arms and a small, faint bulge. The (s) notation indicates that the galaxy has a purely spiral structure. There is uncertainty about the classification, possibly due to NGC 2573's faintness. NGC 2573 is estimated to be 77,800 light years across, making it similar in size to the Milky Way. Alternatively, it has a central mass of {{val|3.229e11|ul=solar mass}}, which is 28% of the latter's mass.

See also

  • NGC 3172 - the closest NGC object to the north celestial pole.

References

{{reflist||refs=

{{Cite DR3|4611769654327946752}}

{{cite journal | last1 = Skrutskie | first1 = M. F. | last2 = Cutri | first2 = R. M. | last3 = Stiening | first3 = R. | last4 = Weinberg | first4 = M. D. | last5 = Schneider | first5 = S. | last6 = Carpenter | first6 = J. M. | last7 = Beichman | first7 = C. | last8 = Capps | first8 = R. | last9 = Chester | first9 = T. | last10 = Elias | first10 = J. | last11 = Huchra | first11 = J. | last12 = Liebert | first12 = J. | last13 = Lonsdale | first13 = C. | last14 = Monet | first14 = D. G. | last15 = Price | first15 = S. | last16 = Seitzer | first16 = P. | last17 = Jarrett | first17 = T. | last18 = Kirkpatrick | first18 = J. D. | last19 = Gizis | first19 = J. E. | last20 = Howard | first20 = E. | last21 = Evans | first21 = T. | last22 = Fowler | first22 = J. | last23 = Fullmer | first23 = L. | last24 = Hurt | first24 = R. | last25 = Light | first25 = R. | last26 = Kopan | first26 = E. L. | last27 = Marsh | first27 = K. A. | last28 = McCallon | first28 = H. L. | last29 = Tam | first29 = R. | last30 = Van Dyk | first30 = S. | last31 = Wheelock | first31 = S. | title = The Two Micron All Sky Survey (2MASS) | journal = The Astronomical Journal | date = February 2006 | volume = 131 | issue = 2 | pages = 1163–1183 | issn = 0004-6256 | eissn = 1538-3881 | doi = 10.1086/498708 | bibcode = 2006AJ....131.1163S | doi-access = free}}

{{cite journal |last1=de Vaucouleurs |first1=G. |last2=de Vaucouleurs |first2=A. |last3=Corwin |first3=H. G. |last4=Buta |first4=R. J. |last5=Paturel |first5=G. |last6=Fouque |first6=P. |title=Book-Review - Third Reference Catalogue of Bright Galaxies |journal=Sky and Telescope |date=December 1991 |volume=82 |pages=621 |language=en |issn=0037-6604 |bibcode=1991S&T....82Q.621D}}

{{cite journal|last=Sorce|first=J. G.|last2=Tully|first2=R. B.|last3=Courtois|first3=H. M.|last4=Jarrett|first4=T. H.|last5=Neill|first5=J. D.|last6=Shaya|first6=E. J.|title=From Spitzer Galaxy photometry to Tully–Fisher distances|journal=Monthly Notices of the Royal Astronomical Society|volume=444|issue=1|date=August 18, 2014|issn=0035-8711|doi=10.1093/mnras/stu1450|doi-access=free|pages=527–541|bibcode=2014MNRAS.444..527S|arxiv=1408.0729|s2cid=118479670}}

{{cite journal |last1=di Nella |first1=H. |last2=Paturel |first2=G. |last3=Walsh |first3=A. J. |last4=Bottinelli |first4=L. |last5=Gouguenheim |first5=L. |last6=Theureau |first6=G. |title=Kinematics of the local universe. III. Neutral hydrogen observations of southern galaxies. |journal=Astronomy and Astrophysics Supplement Series |date=August 1996 |volume=118 |pages=311–321 |language=en |issn=0365-0138 |bibcode=1996A&AS..118..311D}}

{{Cite simbad|title=NGC 2573|access-date=2020-05-29}}

{{Cite web|title=New General Catalog Objects: NGC 2550 - 2599|url=https://cseligman.com/text/atlas/ngc25a.htm#2573|website=cseligman.com|access-date=2020-05-30}}

{{cite journal|last=Kourkchi|first=Ehsan|last2=Tully|first2=R. Brent|title=Galaxy Groups Within 3500 km s −1|journal=The Astrophysical Journal|volume=843|issue=1|date=July 1, 2017|issn=0004-637X|doi=10.3847/1538-4357/aa76db|doi-access=free|page=16 | bibcode = 2017ApJ...843...16K | arxiv = 1705.08068 | s2cid = 119407480}}

{{cite book |last1=Lauberts |first1=Andris |last2=Valentijn |first2=Edwin A. |title=The surface photometry catalogue of the ESO-Uppsala galaxies |date=1989 |publisher=Garching: European Southern Observatory |language=en}}

}}

External links

  • [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%40331138&Name=NGC++2573&submit=display+all+measurements#lab_meas SIMBAD: NGC 2573 -- Galaxy]
  • {{WikiSky}}

{{Ngc30}}

{{Stars of Octans}}

{{Sky|01|41|38.012|-|89|20|04.267}}

{{DEFAULTSORT:NGC 2573}}

Category:Barred spiral galaxies

Category:Octans

2573

006249