Key facts
- Right ascension
- 01 14 53.36
- Declination
- −71 ° 32 ′ 58.7 ″
- Apparent dimensions v
- 2.6 ′ × 2.3 ′
- Mass
- 2.6 × 10 M ☉
- Estimated age
- 0.14 ± 0.03 Gyr
- Other designations
- Kron 69, Lindsay 96, ESO 51-26, RZ2005 197.
- Constellation
- Tucana
via Wikipedia infobox
Wikidata facts
- Instance of
- galaxy
- Part of
- Small Magellanic Cloud
- Constellation
- Tucana
- Image
- NGC 0458 2MASS.jpg
Show 8 more facts
- Commons category
- NGC 458
- catalog code
- ESO 51-26
- discoverer or inventor
- James Dunlop
- time of discovery or invention
- 1826-09-06
- apparent magnitude
- 11.23
- right ascension
- 18.722333
- declination
- -71.549639
- epoch
- J2000.0
via Wikidata · CC0
~1 min read
Encyclopedic overview
NGC 458 is an open cluster located in the constellation Tucana. It was discovered on September 6, 1826, by James Dunlop. It was also observed by John Herschel and DeLisle Stewart. It was described by Dreyer as "pretty faint, large, round, very gradually brighter middle". It was also noted in the second Index Catalogue that it was "probably a cluster, extremely small, close, no nebulosity seen by D.S. (DeLisle Stewart)." At an aperture of 31 arcseconds, its apparent V-band magnitude is 11.73, but at this wavelength, it has 0.12 magnitudes of interstellar extinction.
NGC 458 is quite young, at about 140 million years old. Its estimated mass is 2.6×10 M☉, and its total luminosity is 1.24×10 L☉, leading to a mass-to-luminosity ratio of 0.21 M☉/L☉. However, the dynamical mass may be inaccurate due to the small stellar sample used in the analysis. All else equal, older star clusters have higher mass-to-luminosity ratios; that is, they have lower luminosities for the same mass.
Excerpted from Wikipedia’s “Q938340” article, available under the CC BY-SA 4.0 licence.