Messier 99. NGC 4254

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Messier 99 (NGC 4254) is an SA(s)c-class, nearly face-on galaxy located 46 Mly away from us in the constellation Coma Berenices. M99 shows a slightly asymmetrical structure due, most probably, to an ongoing gravitational interaction with the neutral hydrogen cloud VIRGOHI21. This cloud may have lots of dark matter and shows no stars, but it is considered to contain a small, diffuse, dark galaxy. This galaxy recedes from us at over 2,400 km/s, being the Messier object with the highest redshift. Although it has a similar size compared with our Milky Way, M99 has only 5 % of its mass.


Additional Information


Name(s): Messier 99. M99. NGC 4254

Type: Spiral Galaxy Class SA(s)c

RA:  12h 18m 50s

Dec: +14º 24’ 59”

Constellation: Coma Berenices

Size (arcmin): 5.5×5.0 arc min

Magnitude: +10.4

Distance: 46 Mly


Date: 2022-01-29 to 2022-02-09

Location: Curiosity2 Observatory, New Mexico Skies, Mayhill, NM, USA

Size (arcmin): 24×20 arcmin

Telescope: 24” (61 cm) f/6.5 Reflector

Camera: FLI PL16803 (4096x4096pix)

Guiding: Astrodon MonsterMOAG off-axis guider

Total exposure: 18 hours (L: 7.3h; RGB: 10.75h)

Processing: CCDStack, Photoshop CC 2022

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