Galaxy in the constellation Ursa Major
NGC 3733 is anintermediate spiral galaxy in theconstellation ofUrsa Major . Its velocity with respect to thecosmic microwave background is± 12 km/sHubble distance of 65.3 ± 4.6 Mly (20.03 ± 1.41 Mpc ).[ 1] non-redshift measurements give a farther mean distance of 73.66 ± 6.46 Mly (22.583 ± 1.981 Mpc).[ 2] William Herschel on 14 April 1789.[ 3] [ 4]
NGC 3733 has a possibleactive galactic nucleus , i.e. it has a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars.[ 5] [ 6]
According to A. M. Garcia, NGC 3733 is part of the NGC 3898 group (also known asLGG 250). Thisgalaxy group has nine members, includingNGC 3756 ,NGC 3794 ,NGC 3846 ,NGC 3846A ,NGC 3850 ,NGC 3898 ,NGC 3982 , andUGC 6894 .[ 7] [ 8]
Onesupernova has been observed in NGC 3733:
SN 1980D (Type II , mag. 15) was discovered by Swiss AstronomerPaul Wild on 17 March 1980.[ 9] [ 10] Type I ,[ 11] [ 12] [ 13] ^a b c d e f g h i j k "Results for object NGC 3733" .NASA/IPAC Extragalactic Database .NASA andCaltech . Retrieved28 January 2026 .^ "Distance Results for NGC 3733" .NASA/IPAC Extragalactic Database .NASA . Retrieved28 January 2026 .^ Herschel, William (1802). "Catalogue of 500 New Nebulae, Nebulous Stars, Planetary Nebulae, and Clusters of Stars; with Remarks on the Construction of the Heavens".Philosophical Transactions of the Royal Society of London 92 :477– 528.Bibcode :1802RSPT...92..477H .doi :10.1098/rstl.1802.0021 . ^ Seligman, Courtney."New General Catalogue Objects: NGC 3733" .Celestial Atlas . Retrieved28 January 2026 . ^ "NGC 3733" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved28 January 2026 .^ Asmus, D.; Greenwell, C. L.; Gandhi, P.; Boorman, P. G.; Aird, J.; Alexander, D. M.; Assef, R. J.; Baldi, R. D.; Davies, R. I.; Hönig, S. F.; Ricci, C.; Rosario, D. J.; Salvato, M.; Shankar, F.; Stern, D. (2020)."Local AGN survey (LASr): I. Galaxy sample, infrared colour selection, and predictions for AGN within 100 MPC" .Monthly Notices of the Royal Astronomical Society .494 (2): 1784.arXiv :2003.05959 Bibcode :2020MNRAS.494.1784A .doi :10.1093/mnras/staa766 ^ Garcia, A. M. (1993). "General study of group membership. II. Determination of nearby groups".Astronomy and Astrophysics Supplement Series .100 : 47.Bibcode :1993A&AS..100...47G . ^ "LGG 250" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved28 January 2026 .^ Wild, P.; Faber, S. (1980)."Supernovae" .International Astronomical Union Circular (3462): 1.Bibcode :1980IAUC.3462....1W . ^ "SN 1980D" .Transient Name Server .IAU . Retrieved28 January 2026 .^ Kirshner, R.; Canizares, C.; Kriss, G.; Johns, M. (1980)."Supernova in NGC 3733" .International Astronomical Union Circular (3464): 2.Bibcode :1980IAUC.3464....2K . ^ Zach, L. A. (1986). "Observations of supernovae 1980d and 1980k".Nauchnye Informatsii .61 : 148.Bibcode :1986NInfo..61Q.148Z . ^ Kimeridze, G. N.; Tsvetkov, D. Yu. (1989). "Light curves of the type II supernovas 1980D and 1985L".Astrophysics .31 (1): 423.Bibcode :1989Ap.....31..423K .doi :10.1007/BF01004386 .
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Media related toNGC 3733 at Wikimedia Commons
