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|Observation data (J2000 epoch)|
|Right ascension||03h 53m 02.458s|
|Declination||+35° 35′ 22.17″|
|Distance||71.1 Mpc (232 Mly)|
|Apparent magnitude (V)||13.5|
|Mass||2 trillion M☉|
|Size||463 kly (142 kpc)|
|Apparent size (V)||3.9′ × 1.9′|
|IRAS 03497+3526, MCG+06-09-012, TC 49, Z 039.8+3527|
UGC 2885 (Rubin's Galaxy, nicknamed "Godzilla galaxy") is a large barred spiral galaxy of type SA(rs)c in the constellation Perseus. It is 232 million light-years (71 Mpc) from Earth and measures 463,000 ly (142,000 pc) across, making it one of the largest known spiral galaxies. It is also a possible member of the Pisces-Perseus supercluster.
UGC 2885 is classified as a field galaxy—a class of galaxies found in remote, under-dense and “vacant” sections of space, far from other major galaxies. NASA has reported that the theorized main source for disk growth for UGC 2885 came from the accretion of intergalactic hydrogen gas, rather than through the repeated process of galactic collision, as most galaxies are thought to grow.
The lack of interaction is evident from the near-perfect structure of the spiral arms and disk, lack of tidal tails, and modest rate of star formation—approximately 0.5 solar masses/year.
Additionally, despite being originally classified as an unbarred spiral galaxy, new Hubble images clearly show the presence of a small bar cutting across the ring structure of the core. This is peculiar, as most bars are thought to form through minor gravitational perturbations brought on by satellite and neighboring galaxies, which is something this galaxy lacks. This galaxy highlights that bars are able to form in spiral galaxies without the influence of another galaxy—this indicates that other forces, such as interactions between stars, gas and dust, as well as the gravitational influence of dark matter, might play a role in their development.
- IC 1101
- NGC 6872 and IC 4970, mistakenly claimed to be the largest spiral galaxy in 2013
- Malin 1, the largest known spiral galaxy
- NGC 262
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- Canzian, Blaise; Allen, R. J.; Tilanus, R. P. J. (1993). "Spiral structure of the giant galaxy UGC 2885 - H-alpha kinematics". The Astrophysical Journal. 406: 457. Bibcode:1993ApJ...406..457C. doi:10.1086/172457.
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- Jeremy Heyl (1980). UGC 2885, the Largest Known Spiral Galaxy (PDF). The University of British Columbia.
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- "SN 2002F". Retrieved 2018-05-17.