fbpx
Wikipedia

NGC 691

October 21, 2023

NGC 691 is an unbarred spiral galaxy located in the constellation Aries. It is located at a distance of circa 120 million light years from Earth, which, given its apparent dimensions, means that NGC 691 is about 130,000 light years across. It was discovered by William Herschel on November 13, 1786.[3]

NGC 691
NGC 691 by the Liverpool Telescope
Observation data (J2000 epoch)
ConstellationAries
Right ascension01h 50m 41.7s[1]
Declination+21° 45′ 36″[1]
Redshift0.008889 ± 0.000013 [1]
Heliocentric radial velocity2,665 ± 5 km/s[1]
Distance119 ± 14 Mly (36.5 ± 4.3 Mpc)[1]
Apparent magnitude (V)11.5 [2]
Characteristics
TypeSA(rs)bc [1]
Apparent size (V)3.5′ × 2.6′ [1]
Other designations
UGC 1305, CGCG 482-023, MCG +04-05-019, PGC 6793[1]

NGC 691 features a multiple ring structure, with three rings recognised in the infrared, with diameters of 1.03, 1.67, and 2.79 arcminutes.[4] When imaged in H-alpha, the galaxy appears patchy. The total star formation rate of the galaxy is estimated to be about 0.6 M☉ per year.[5] One supernova has been observed in NGC 691, SN 2005W. It was discovered by Yoji Hirose in unfiltered CCD frames taken on Feb. 1.442 UT with a 0.35-m f/6.8 Schmidt-Cassegrain reflector. The supernova was located 56" east and 1" south of the center of NGC 691 and at the time of the discovery had an apparent magnitude of 15.2.[6] Spectrographic observations indicated it was a type Ia supernova about a week before maximum.[7] The peak magnitude of the supernova was 14.3, on February 10.759.[8]

NGC 691 is the foremost member of a galaxy group known as the NGC 691 group. Other members of the group include IC 163, NGC 678, NGC 680, NGC 694, IC 167, and NGC 697.[9]

Gallery Edit

References Edit

  1. ^ a b c d e f g h "NASA/IPAC Extragalactic Database". Results for NGC 691. Retrieved 2016-01-18.
  2. ^ "Revised NGC Data for NGC 691". spider.seds.org. Retrieved 25 November 2018.
  3. ^ Seligman, Courtney. "NGC 691 (= PGC 6793)". Celestial Atlas. Retrieved 19 November 2018.
  4. ^ Comerón, S.; Salo, H.; Laurikainen, E.; Knapen, J. H.; Buta, R. J.; Herrera-Endoqui, M.; Laine, J.; Holwerda, B. W.; Sheth, K.; Regan, M. W.; Hinz, J. L.; Muñoz-Mateos, J. C.; Gil de Paz, A.; Menéndez-Delmestre, K.; Seibert, M.; Mizusawa, T.; Kim, T.; Erroz-Ferrer, S.; Gadotti, D. A.; Athanassoula, E.; Bosma, A.; Ho, L. C. (19 February 2014). "ARRAKIS: atlas of resonance rings as known in the S4G". Astronomy & Astrophysics. 562: A121. arXiv:1312.0866. Bibcode:2014A&A...562A.121C. doi:10.1051/0004-6361/201321633. S2CID 119295831.
  5. ^ Erroz-Ferrer, Santiago; Knapen, Johan H.; Leaman, Ryan; Cisternas, Mauricio; Font, Joan; Beckman, John E.; Sheth, Kartik; Muñoz-Mateos, Juan Carlos; Díaz-García, Simón; Bosma, Albert; Athanassoula, E.; Elmegreen, Bruce G.; Ho, Luis C.; Kim, Taehyun; Laurikainen, Eija; Martinez-Valpuesta, Inma; Meidt, Sharon E.; Salo, Heikki (21 July 2015). "Hα kinematics of S4G spiral galaxies – II. Data description and non-circular motions". Monthly Notices of the Royal Astronomical Society. 451 (1): 1004–1024. arXiv:1504.06282. Bibcode:2015MNRAS.451.1004E. doi:10.1093/mnras/stv924. S2CID 73618748.
  6. ^ "IAUC 8475: 2005W; 2005U; C/2004 Y9-Y11, C/2005 B2". www.cbat.eps.harvard.edu. IAU. 2 February 2005.
  7. ^ "IAUC 8479: 2005ab, 2005ad; 2005W; C/1995 O1; N IN M31". www.cbat.eps.harvard.edu. IAU. 7 February 2005.
  8. ^ "IAUC 8486: 2005ah; 2005ai; 2004gw, 2005T,, 2005ae; 2005W". www.cbat.eps.harvard.edu. IAU. 13 February 2005.
  9. ^ Garcia, A. M. (1993). "General study of group membership. II - Determination of nearby groups". Astronomy and Astrophysics Supplement Series. 100 (1): 47–90. Bibcode:1993A&AS..100...47G. ISSN 0365-0138.

External links Edit

  •   Media related to NGC 691 at Wikimedia Commons
  • NGC 691 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
  • NGC 691 on SIMBAD

October 21, 2023
unbarred, spiral, galaxy, located, constellation, aries, located, distance, circa, million, light, years, from, earth, which, given, apparent, dimensions, means, that, about, light, years, across, discovered, william, herschel, november, 1786, liverpool, teles. NGC 691 is an unbarred spiral galaxy located in the constellation Aries It is located at a distance of circa 120 million light years from Earth which given its apparent dimensions means that NGC 691 is about 130 000 light years across It was discovered by William Herschel on November 13 1786 3 NGC 691NGC 691 by the Liverpool TelescopeObservation data J2000 epoch ConstellationAriesRight ascension01h 50m 41 7s 1 Declination 21 45 36 1 Redshift0 008889 0 000013 1 Heliocentric radial velocity2 665 5 km s 1 Distance119 14 Mly 36 5 4 3 Mpc 1 Apparent magnitude V 11 5 2 CharacteristicsTypeSA rs bc 1 Apparent size V 3 5 2 6 1 Other designationsUGC 1305 CGCG 482 023 MCG 04 05 019 PGC 6793 1 NGC 691 features a multiple ring structure with three rings recognised in the infrared with diameters of 1 03 1 67 and 2 79 arcminutes 4 When imaged in H alpha the galaxy appears patchy The total star formation rate of the galaxy is estimated to be about 0 6 M per year 5 One supernova has been observed in NGC 691 SN 2005W It was discovered by Yoji Hirose in unfiltered CCD frames taken on Feb 1 442 UT with a 0 35 m f 6 8 Schmidt Cassegrain reflector The supernova was located 56 east and 1 south of the center of NGC 691 and at the time of the discovery had an apparent magnitude of 15 2 6 Spectrographic observations indicated it was a type Ia supernova about a week before maximum 7 The peak magnitude of the supernova was 14 3 on February 10 759 8 NGC 691 is the foremost member of a galaxy group known as the NGC 691 group Other members of the group include IC 163 NGC 678 NGC 680 NGC 694 IC 167 and NGC 697 9 Gallery Edit nbsp NGC 691 SDSS DR14 nbsp NGC 691 top and IC 167 bottom by the Mount Lemmon SkyCenter nbsp Hubble Space TelescopeReferences Edit a b c d e f g h NASA IPAC Extragalactic Database Results for NGC 691 Retrieved 2016 01 18 Revised NGC Data for NGC 691 spider seds org Retrieved 25 November 2018 Seligman Courtney NGC 691 PGC 6793 Celestial Atlas Retrieved 19 November 2018 Comeron S Salo H Laurikainen E Knapen J H Buta R J Herrera Endoqui M Laine J Holwerda B W Sheth K Regan M W Hinz J L Munoz Mateos J C Gil de Paz A Menendez Delmestre K Seibert M Mizusawa T Kim T Erroz Ferrer S Gadotti D A Athanassoula E Bosma A Ho L C 19 February 2014 ARRAKIS atlas of resonance rings as known in the S4G Astronomy amp Astrophysics 562 A121 arXiv 1312 0866 Bibcode 2014A amp A 562A 121C doi 10 1051 0004 6361 201321633 S2CID 119295831 Erroz Ferrer Santiago Knapen Johan H Leaman Ryan Cisternas Mauricio Font Joan Beckman John E Sheth Kartik Munoz Mateos Juan Carlos Diaz Garcia Simon Bosma Albert Athanassoula E Elmegreen Bruce G Ho Luis C Kim Taehyun Laurikainen Eija Martinez Valpuesta Inma Meidt Sharon E Salo Heikki 21 July 2015 Ha kinematics of S4G spiral galaxies II Data description and non circular motions Monthly Notices of the Royal Astronomical Society 451 1 1004 1024 arXiv 1504 06282 Bibcode 2015MNRAS 451 1004E doi 10 1093 mnras stv924 S2CID 73618748 IAUC 8475 2005W 2005U C 2004 Y9 Y11 C 2005 B2 www cbat eps harvard edu IAU 2 February 2005 IAUC 8479 2005ab 2005ad 2005W C 1995 O1 N IN M31 www cbat eps harvard edu IAU 7 February 2005 IAUC 8486 2005ah 2005ai 2004gw 2005T 2005ae 2005W www cbat eps harvard edu IAU 13 February 2005 Garcia A M 1993 General study of group membership II Determination of nearby groups Astronomy and Astrophysics Supplement Series 100 1 47 90 Bibcode 1993A amp AS 100 47G ISSN 0365 0138 External links Edit nbsp Media related to NGC 691 at Wikimedia Commons NGC 691 on WikiSky DSS2 SDSS GALEX IRAS Hydrogen a X Ray Astrophoto Sky Map Articles and images NGC 691 on SIMBAD Retrieved from https en wikipedia org w index php title NGC 691 amp oldid 1162384706, wikipedia, wiki, book, books, library,

article

, read, download, free, free download, mp3, video, mp4, 3gp, jpg, jpeg, gif, png, picture, music, song, movie, book, game, games.