Galaxy Messier 98

Messier 98
Messier 98: Galaxy in Coma Berenices; 500 mm Cassegrain 3625 mm f/7.2; SBIG STL11K; 430+40+40+40 min LRGB; Bernese Highlands; © 2015 Radek Chromik

History

M 98 was discovered by Pierre Méchain on March 15, 1781 and cataloged by Charles Messier on April 13, along with M 99 and M 100. He noted: «Nebula without a star, of very weak light, above the northern wing of the Jungfrau, on the parallel and next to the star no. 6, fifth size in the hair of Berenike, according to Flamsteed. M. Méchain saw him on March 15, 1781.» [281]

Physical Properties

Messier 98
Messier 98: Image taken with the Hubble Telescope [215]

The spiral galaxy M 98 is of the morphological type SAB(s)ab, which we see obliquely from the edge. It has an active core of the LINER type (Low-ionization nuclear emission-line region), is a Seyfert type 3 galaxy and numerous star formation regions with many young, hot, blue stars. It contains about one trillion (1012) stars and is about 14 Mpc (45 million light years) away. It is approaching us at a speed of 142 km/s. [194, 292]

«Catalogue of Principal Galaxies (PGC)», Paturel et al. 1989 [144]
DesignationsPGC 39028: NGC 4192, UGC 7231, MCG 3-31-79, M 98, CGCG 98-108, VCC 92, IRAS 12112+1510
Right Ascension (J2000.0)12h 13m 48.1s
Declination (J2000.0)+14° 53' 42"
Morphological TypeSB
Dimensions9.4' x 2.3'
Visual Magnitude10.9 mag
Radial Velocity (HRV)-142 km/s
Position Angle155°

Further Galaxies in that Area

In addition to M 98, there are two smaller, much more distant galaxies: NGC 4186 was discovered by Wilhelm Tempel in 1877. It is of the morphological type SA (s) from? and is approximately 112 Mpc (365 million light years) away. NGC 4192A (UGC 7223) is located 35 Mpc (114 million light years) away. [194, 196]

«Catalogue of Principal Galaxies (PGC)», Paturel et al. 1989 [144]
NameRA [hms]Dec [dms]mTypeDim [']Btot [mag]HRV [km/s]PA [°]
UGC 722312 13 26.2+14 46 19S1.3 x 1.215.62075
NGC 418612 14 06.4+14 43 37S R1.0 x .814.6788260

Finder Chart

M 98 is located in the constellation Coma Berenices between the two bright stars Vindemiatrix (ε Virginis) and Denebola (β Leonis), about a third closer to Denebola, about half a degree west of the 5 mag bright star 6 Comae Berenices . The best time for observation is January to July.

Chart M 98
Chart created using SkySafari 6 Pro and STScI Digitized Sky Survey. [149, 160]

References

144Catalogue of Principal Galaxies (PGC); Paturel G., Fouque P., Bottinelli L., Gouguenheim L.; Astron. Astrophys. Suppl. Ser. 80, 299 (1989); cdsarc.unistra.fr/viz-bin/cat/VII/119 (2021-02-18)
149SkySafari 6 Pro, Simulation Curriculum; skysafariastronomy.com
160The STScI Digitized Sky Survey; archive.stsci.edu/cgi-bin/dss_form
194NASA/IPAC Extragalactic Database (NED); ned.ipac.caltech.edu (2020-12-27)
196Celestial Atlas by Curtney Seligman; cseligman.com/text/atlas.htm (2020-12-28)
215Explore - The Night Sky | Hubble’s Messier Catalog; nasa.gov/content/goddard/hubble-s-messier-catalog (2020-12-31)
281«Catalogue Nébuleuses et des Amas D'Étoiles» Observées à Paris, par M. Messier, à l'Observatoire de la Marine, hôtel de Clugni, rue des Mathurins. «Connoissance des temps ou connoissance des mouvements célestes, pour l'année bissextile 1784 » Page 227; gallica.bnf.fr/ark:/12148/bpt6k6514280n/f235 (2021-02-21)
292Why so blue?; eso.org/public/images/potw1636a (2021-03-07)