NGC 5102

NGC 5102, also known as Iota's Ghost since it appears near Iota Centauri in the sky,^[6] is a lenticular galaxy in the Centaurus A/M83 Group of galaxies. It was discovered by John Herschel in 1835.

NGC 5102
NGC 5102 imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
Constellation	Centaurus
Right ascension	13h 21m 57.6s[1]
Declination	−36° 37′ 49″[1]
Redshift	468 ± 2 km/s[1]
Distance	12.1 ± 0.7 Mly (3.70 ± 0.23 Mpc)[2][3][4][5]
Apparent magnitude (V)	10.4[1]
Characteristics
Type	SA0−[1]
Apparent size (V)	8.7′ × 2.8′[1]
Other designations
PGC 46674[1]

Distance measurements

At least two techniques have been used to measure the distance to NGC 5102. The surface brightness fluctuations distance measurement technique estimates distances to spiral galaxies based on the graininess of the appearance of their bulges. The distance measured to NGC 5102 using this technique is 13.0 ± 0.8 Mly (4.0 ± 0.2 Mpc).^[2] However, NGC 5102 is close enough that the tip of the red giant branch (TRGB) method may be used to estimate its distance. The estimated distance to NGC 5102 using this technique is 11.1 ± 1.3 Mly (3.40 ± 0.39 Mpc).^[3] Averaged together, these distance measurements give a distance estimate of 12.1 ± 0.7 Mly (3.70 ± 0.23 Mpc).^[5]