NGC 515

NGC 515
NGC 515
NGC 515 and NGC 517 as seen on SDSS
Observation data (J2000[1] epoch)
ConstellationPisces[2]
Right ascension01h 24m 38.6s[3]
Declination+33° 28′ 22″[3]
Redshift0.01700 ± 0.00007[1]
Heliocentric radial velocity(5053 ± 21) km/s[1]
Distance228 Mly[4]
Apparent magnitude (V)13.1[2]
Apparent magnitude (B)14.1[2]
Characteristics
TypeS0[2]
Apparent size (V)1.4' × 1.1'[2]
Other designations
PGC 5201, UGC 956, GC 299, MGC +05-04-052, 2MASS J01243853+3328214, h 113[1][5]

NGC 515, also occasionally referred to as PGC 5201 or UGC 956, is a lenticular galaxy located approximately 228 million light-years from the Solar System[4] in the constellation Pisces.[2] It was discovered on 13 September 1784 by astronomer William Herschel.[5]

Observation history

Herschel discovered the object along with NGC 517 using Beta Andromedae as a reference star. He described his discovery as "two, both stellar", indicating his misidentification of the object as a star. The position noted for NGC 515 is just 35 seconds east of UGC 956, thus the two entries are generally thought to be the same object.[6] The object was also observed by John Herschel, son of William Herschel and later catalogued by John Louis Emil Dreyer in the New General Catalogue, where the galaxy was described as "pretty faint, very small, round, northwestern of 2" with the other one being NGC 517.[5]

Description

The galaxy has an apparent visual magnitude of 13.1 and can be classified as type S0 using the Hubble Sequence.[2] The object's distance of roughly 230 million light-years from the Solar System can be estimated using its redshift and Hubble's law.[4]

See also

References

  1. ^ a b c d "NGC 515". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-12-09.
  2. ^ a b c d e f g "Revised NGC Data for NGC 515". spider.seds.org. Retrieved 2017-10-05.
  3. ^ a b "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2017-10-05.
  4. ^ a b c An object's distance from Earth can be determined using Hubble's law: v=Ho is Hubble's constant (70±5 (km/s)/Mpc). The relative uncertainty Δd/d divided by the distance is equal to the sum of the relative uncertainties of the velocity and v=Ho
  5. ^ a b c "New General Catalog Objects: NGC 500 - 549". cseligman.com. Retrieved 2017-10-16.
  6. ^ "astronomy-mall.com/Adventures.In.Deep.Space/NGC%201-7840%20complete.htm".
Wikimedia Commons has media related to NGC 515.