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Maffei 1 is a giant elliptical galaxy in the constellation Cassiopeia. Once believed to be a member of the Local Group of galaxies, it is now known to belong to its own group, the IC 342/Maffei Group. It was named after Paolo Maffei, who discovered it and the neighboring Maffei 2 in 1967 via their infrared emissions.

Maffei 1
Maf1atlas.jpg
Observation data (J2000 epoch)
Constellation Cassiopeia
Right ascension 02 36 35.4
Declination +59° 39′ 19″
Helio radial velocity 66.4 ± 5.0 km/s
Distance 2.85 ± 0.36 Mpc
4.4+0.6
−0.5
 Mpc
Apparent magnitude  11.14 ± 0.06 (V-band)
Characteristics
Type S0 pec, E3
Size 75,000 Ly
(23,000 Parsecs)
Apparent size  3′.36 × 1′.68
Other designations
PGC 9892, Sharpless 191
See also: Galaxy, List of galaxies

Maffei 1 is a giant elliptical galaxy in the constellation Cassiopeia. Once believed to be a member of the Local Group of galaxies, it is now known to belong to its own group, the IC 342/Maffei Group. It was named after Paolo Maffei, who discovered it and the neighboring Maffei 2 in 1967 via their infrared emissions.

Maffei 1 is a slightly flattened core type elliptical galaxy. It has a boxy shape and is made mainly of old metal-rich stars. It has a tiny blue nucleus in which stars continue to form. Like all large ellipticals it contains a significant population of globular clusters. Maffei 1 is situated at an estimated distance of 3–4 Mpc from the Milky Way. It may be the closest giant elliptical galaxy.

Maffei 1 lies in the Zone of Avoidance and is heavily obscured by the Milky Way's stars and dust. If it were not obscured, it would be one of the largest (about 3/4 the size of the full moon) brightest and best-known galaxies in the sky. It can be observed visually, using a 30–35 cm or bigger telescope under a very dark sky.

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