Messier 66

Coordinates: Sky map 11h 20m 15.0s, +12° 59′ 30″
Source: Wikipedia, the free encyclopedia.

J2000 epoch)
ConstellationLeo
Right ascension11h 20m 15.026s[1]
Declination+12° 59′ 28.64″[1]
Redshift0.002425±0.000010[2] (696.3±12.7 km/s)[3]
Distance31 Mly (9.6 Mpc)[4]
Apparent magnitude (V)8.9[2]
Characteristics
TypeSAB(s)b[5]
Apparent size (V)9.1′ × 4.2′[6]
Notable featuresGalaxy in the Leo Triplet
Other designations
Arp 16, NGC 3627, PGC 34695, UGC 6346[7]

Messier 66 or M66, also known as NGC 3627, is an

′.[9]

M66 has a morphological classification of SABb,[5] indicating a spiral shape with a weak bar feature and loosely wound arms. The isophotal axis ratio is 0.32, indicating that it is being viewed at an angle.[5] M66 is receding from us with a heliocentric radial velocity of 696.3±12.7 km/s.[3] It lies 31[4] million light-years away and is about 95 thousand light-years across[11] with striking dust lanes and bright star clusters along sweeping spiral arms.

Five supernovae have been observed in M66: SN 1973R (type IIP, mag. 14.5),[12] SN 1989B (type Ia, mag. 13),[13] SN 1997bs (Type IIn, mag. 17),[14] SN 2009hd (Type II, mag. 15.8),[15] and SN 2016cok (Type IIP, mag. 16.6).[16][17][18] SN 2016cok was discovered by the All Sky Automated Survey for Supernovae.[19]

Gravitational interaction from its past encounter with neighboring NGC 3628 has resulted in an extremely high central mass concentration; a high

H I material apparently removed from one of the spiral arms. The latter feature shows up visually as an extremely prominent and unusual spiral arm and dust lane structures as originally noted in the Atlas of Peculiar Galaxies.[20]

Gallery

See also

  • List of Messier objects

References

  1. ^
    S2CID 18913331
    .
  2. ^
    Springer-Verlag
    .
  3. ^
    S2CID 117876537
    , 10.
  4. ^
    S2CID 250737862
    , 50.
  5. ^
    S2CID 119253507
    .
  6. ^ "NASA/IPAC Extragalactic Database", Results for NGC 3627, retrieved 31 August 2006.
  7. ^ "NGC 3627". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2 December 2018.
  8. ^ Frommert, Hartmut; Kronberg, Christine (15 June 2016), Spiral Galaxy M66, retrieved 3 December 2018.
  9. ^
    ISBN 978-1107018372
    It is recorded as discovered by Pierre Méchain, but apparently this is an error.
  10. ISBN 978-3319653853
  11. small angle formula
    : 31 mly × tan( 9.1′ ) = ~82 kly. diameter
  12. ^ Transient Name Server entry for SN 1973R. Retrieved 24 March 2023.
  13. ^ Transient Name Server entry for SN 1989B. Retrieved 24 March 2023.
  14. ^ Transient Name Server entry for SN 1997bs. Retrieved 24 March 2023.
  15. ^ Transient Name Server entry for SN 2009hd. Retrieved 24 March 2023.
  16. Bibcode:2016ATel.9189....1S
    .
  17. ^ List of Supernovae, Central Bureau for Astronomical Telegrams, retrieved 9 September 2015
  18. ^ Transient Name Server entry for SN 2016cok. Retrieved 24 March 2023.
  19. ^ Lewis, Danny. "Spy Two Supernovae in June's Night Sky". Smithsonian. Retrieved 22 November 2019.
  20. doi:10.1086/173374
    .

External links

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