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NGC 3447

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NGC 3447
NGC 3447 (center-right), as seen by the Hubble Space Telescope. UGC 6007 can be seen on the left.
Observation data (J2000 epoch)
ConstellationLeo
Right ascension10h 53m 24s
Declination+16° 46’ 20”
Redshift0.003559
Distance70 Mly (21.4 Mpc)
Apparent magnitude (B)14.3
Surface brightness25.37 mag/arcsec^2 (3447) and 24.38 mag/arcsec^2 (3447A)
Characteristics
TypeSAm (3447) and Im (3447A)
Other designations
PGC 32694/32700, UGC 6006/6007, VV 252, IRAS 10507+1702, CGCG 095-058, KPG 255
Barred Magellanic spiral galaxy in the constellation Leo

NGC 3447 is a barred Magellanic spiral galaxy located in the constellation Leo. Its speed relative to the cosmic microwave background is 1,405 ± 34 km/s, which corresponds to a Hubble distance of 20.7 ± 1.5 Mpc (∼67.5 million ly). It was discovered by the British astronomer John Herschel in 1836.

NGC 3447 shows a broad HI line.

With a surface brightness equal to 15.61 mag/am^2, NGC 3443 is classified as a low surface brightness galaxy (LSB). LSB galaxies are diffuse galaxies with a surface brightness less than one magnitude lower than that of the ambient night sky.

To date, four non-redshift measurements yield a distance of 13.730 ± 9.802 Mpc (∼44.8 million ly), which is slightly outside the range values of Hubble.

NGC 3447A

NGC 3447A, also known as UGC 6007, is an irregular galaxy in contact with NGC 3447. It has roughly the same apparent magnitude, and has a slightly lower surface brightness. Due to gravitational forces, it has become distorted, showing disrupted spiral arms and remnants of its spiral structure, hinting it might have been a spiral galaxy in the past.

Supernova

The supernova SN 2012ht (type Ia, mag. 18.6) was discovered in NGC 3447 by Koichi Nishiyama and Fujio Kabashima on December 18, 2012.

NGC 3447 group

NGC 3447 is the largest galaxy in a group of galaxies named after it. The NGC 3447 group includes at least 4 other galaxies: NGC 3447A, NGC 3457, UGC 6022 and UGC 6035.

See also

External links

References

  1. ^ "By Name | NASA/IPAC Extragalactic Database". ned.ipac.caltech.edu. Retrieved 2024-07-21.
  2. "Revised data from NGC/IC Catalogue by Wolfgang Steinckle from NGC 3400 to 3499". astrovalleyfield.ca. Retrieved 2024-07-21.
  3. "NED Query Results for NGC 3447". ned.ipac.caltech.edu. Retrieved 2024-07-21.
  4. Mazzei, P.; Marino, A.; Rampazzo, R.; Plana, H.; Rosado, M.; Arias, L. (2018-02-01). "Galaxy evolution in groups. NGC 3447/NGC 3447A: the odd couple in LGG 225". Astronomy and Astrophysics. 610: A8. arXiv:1710.07474. doi:10.1051/0004-6361/201731182. ISSN 0004-6361.
  5. information@eso.org. "Defying cosmic convention". www.esahubble.org. Retrieved 2024-07-21.
  6. Transient Name Server entry for SN 2012ht. Retrieved 23 July 2024.
  7. dbishopx@gmail.com. "Bright Supernovae - 2012". rochesterastronomy.org. Retrieved 2024-07-21.
  8. Nishiyama, K.; Kabashima, F.; Yusa, T.; Itagaki, K.; Nakano, S.; Brimacombe, J.; Milisavljevic, D.; Martin, E. O.; Yamanaka, M.; Takaki, K.; Itoh, R.; Ueno, I.; Moritani, Y.; Akitaya, H.; Kawabata, K. S. (2012-12-01). "Supernova 2012ht in NGC 3447 = Psn J10532275+1646349". Central Bureau Electronic Telegrams. 3349: 1.
  9. Garcia, A. M. (1993-07-01). "General study of group membership. II. Determination of nearby groups". Astronomy and Astrophysics Supplement Series. 100: 47–90. ISSN 0365-0138.
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