M84

Galaxy	List of galaxies
M84, taken by NOAO NGC 4414, a typical spiral galaxy in the constellation Coma Berenices, is about 56,000 light years in diameter and approximately 60 million light years distant. ... List of galaxies: Abell 1835 IR1916 AM 0644-741 Andromeda Galaxy (M31/NGC 224) Andromeda I Andromeda II Andromeda III Aquarius Dwarf Barnards Galaxy (NGC 6822) Black Eye Galaxy (M64/NGC 4826) Bodes Galaxy (M81/NGC 3031) Canis Major Dwarf Galaxy Carina Dwarf Centaurus A Galaxy Draco Dwarf Fornax... Image File history File links M84. ... The National Optical Astronomy Observatory (NOAO) consists of four observatories under one management structure: Kitt Peak National Observatory Cerro Tololo Inter-American Observatory Gemini Observatory National Solar Observatory It is run by the Association of Universities for Research in Astronomy (AURA), with a cooperative agreement with the National Science Foundation...
Observation data (Epoch J2000.0)
Type	S0
Right ascension	12h 25.1m
Declination	+12° 53′
Distance	60 million ly
Redshift	?
Apparent magnitude (V)	+9.1
Apparent dimensions (V)	5.0 arcmins
Constellation	Virgo
Physical characteristics
Radius	-
Absolute magnitude (V)	-
Notable features	-
Other designations
NGC 4374

The M84 (also known as Messier Object 84, Messier 84, or NGC 4374) is a lenticular galaxy in the constellation Virgo. It was discovered by Charles Messier in 1781. M84 is situated in the heavily populated inner core of the Virgo Cluster of galaxies. In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... Astronomers classify galaxies based on their overall shape (elliptical, spiral or barred spiral) and further by the specific properties of the individual galaxy (for example degree of ellipse, number of spirals or definition of bar). ... Right ascension (RA; symbol α: Greek letter alpha) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. ... In astronomy, declination (dec) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. ... (Redirected from 1 E22 m) Categories: Orders of magnitude (length) ... A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ... Redshift of spectral lines in the optical spectrum of a supercluster of distant galaxies (right), as compared to that of the Sun (left). ... // Headline text HEY!! HOW ARE YOU ALL?? Its nice of you to come read this page. ... It has been suggested that milliarcsecond be merged into this article or section. ... Orion is a remarkable constellation, visible from most places on the globe at one time or another during the year. ... In classical geometry, a radius of a circle or sphere is any line segment from its center to its boundary. ... In astronomy, absolute magnitude is the apparent magnitude, m, an object would have if it were at a standard luminosity distance away from us (in the absence of interstellar extinction!). It allows the overall brightnesses of objects to be compared without regard to distance. ... The Spindle Galaxy (NGC 5866), a lenticular galaxy in the Draco constellation. ... Orion is a remarkable constellation, visible from most places on the globe at one time or another during the year. ... Virgo (Latin for virgin, symbol , Unicode ♍) is a constellation of the zodiac. ... Charles Messier Charles Messier (June 26, 1730 – April 12, 1817) was a French astronomer who in 1774 published a catalogue of 45 deep sky objects such as nebulae and star clusters. ... 1781 was a common year starting on Monday (see link for calendar). ... A sky field near some of the brighter galaxies in the Virgo cluster. ...

Radio observations and images of the Hubble Space Telescope of M84 have revealed two jets of matter shooting out from the galaxy's center as well as a disk of rapidly rotating gas and stars close to the nucleus indicating the presence of a supermassive black hole of 300 million solar masses in the galaxy's nucleus. The Hubble Space Telescope (HST) is a telescope in orbit around the Earth. ... A black hole is a concentration of mass great enough that the force of gravity prevents anything past its event horizon from escaping it except through quantum tunnelling behaviour (known as Hawking Radiation). ...

Three supernovae have been observed in M84. Multiwavelength X-ray image of the remnant of Keplers Supernova, SN 1604. ...

External link

• Lenticular Galaxy M84 @ SEDS Messier pages