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UGC 3855

UGC 3855
UGC 3855 and a foreground star imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationLynx
Right ascension07h 28m 12.8469s[1]
Declination+58° 30′ 22.881″[1]
Redshift0.010564±0.0000270[1]
Heliocentric radial velocity3,167±8 km/s[1]
Distance130.95 ± 11.37 Mly (40.150 ± 3.486 Mpc)[1]
Characteristics
TypeSab[1]
Size~93,200 ly (28.59 kpc) (estimated)[1]
Other designations
IRAS F07239+5836, 2MASX J07281299+5830242, MCG +10-11-052, PGC 21067, CGCG 286-020[1]

UGC 3855, also known as PGC 21067 or sometimes as the Modest galaxy, is a spiral galaxy in the constellation of Lynx.[2][3] Its velocity with respect to the cosmic microwave background is 3,236±9 km/s,[1] which corresponds to a Hubble distance of 155.7 ± 10.9 Mly (47.73 ± 3.35 Mpc). However, 4 non-redshift measurements give a closer mean distance of 130.95 ± 11.37 Mly (40.150 ± 3.486 Mpc).[4] The first known reference to this galaxy comes from Part 1 of the Morphological Catalogue of Galaxies, published in 1962, where it is listed as MCG +10-11-052.[5]

It is a relatively old galaxy with a stellar population around 10.6 billion years old. It also has a low rate of star formation of about 0.2 solar masses per year.[6]

Supernova

One supernova has been observed in UGC 3855: SN 2021agco (Type Ib, mag. 17.6) was discovered by the Xingming Observatory Sky Survey (XOSS) on 5 December 2021.[7] It is the closest ultra-stripped supernova yet discovered.[6]

References

  1. ^ a b c d e f g h i "Results for object UGC 03855". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 20 April 2026.
  2. ^ [email protected]. "The Modest Galaxy". www.esahubble.org. Retrieved 14 November 2025.
  3. ^ Ford, Dominic. "UGC 3855 (Galaxy)". In-The-Sky.org. Retrieved 14 November 2025.
  4. ^ "Distance Results for UGC 03855". NASA/IPAC Extragalactic Database. NASA. Retrieved 20 April 2026.
  5. ^ Vorontsov-Vel'Yaminov, B. A.; Arkhipova, V. P. (1962). "Morphological catalogue of galaxies. Part 1". Morphological Catalogue of Galaxies. C01. Bibcode:1962MCG...C01....0V.
  6. ^ a b Yan, Shengyu; Wang, Xiaofeng; Gao, Xing; Zhang, Jujia; Filippenko, Alexei V.; Brink, Thomas G.; Mo, Jun; Lin, Weili; Xiang, Danfeng; Ma, Xiaoran; Guo, Fangzhou; Tomasella, Lina; Benetti, Stefano; Cai, Yongzhi; Cappellaro, Enrico (1 December 2023). "Discovery of the Closest Ultra-stripped Supernova: SN 2021agco in UGC 3855". The Astrophysical Journal Letters. 959 (2): L32. arXiv:2310.04827. Bibcode:2023ApJ...959L..32Y. doi:10.3847/2041-8213/ad0cc3. ISSN 2041-8205.
  7. ^ "SN 2021agco". Transient Name Server. IAU. Retrieved 20 April 2026.


  • Wikimedia Commons logo Media related to UGC 3855 at Wikimedia Commons
  • UGC 3855 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images


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