Globular Cluster M31 G1

 Globular Cluster M31 G1

Credits

NASA and Michael Rich (UCLA)

About The Object
Object Name G1 in M31, Mayall II
Object Description Globular Cluster in the Milky Way Galaxy
R.A. Position 00h 32m 46.9m
Dec. Position +39° 34' 42"
Constellation Andromeda
Distance G1's distance to Earth is about 2.2 million light-years (675,000 parsecs). Its distance to the galactic center of M31 is about 120,000 light-years (36.8 kiloparsecs).
Dimensions The image is about 24 arcseconds (770 parsecs or 2500 light-years) in the horizontal dimension. Mass of the black hole: 20,000 times the mass of the Sun
About The Data
Data Description WFPC2 Data Principal Astronomers: M. Rich (UCLA), K. Mighell (NOAO), and J. Neill (Columbia U.), and W. Freedman (Carnegie Observatories) STIS Data Principal Astronomers: M. Rich (UCLA), K. Gebhardt (U. Texas at Austin), and L. Ho (Carnegie Inst. of Washington)
Instrument HST>WFPC2 and HST>STIS
Exposure Dates July 1994, Exposure Time: 1.9 hours (WFPC2), and October - November 2001, Exposure Time: 8.3 hours (STIS)
Filters WFPC2: F555W (V) and F814W (I) STIS: G430L, G750M
About The Image
Compass Image Globular Cluster M31 G1
About The Object
Object Name A name or catalog number that astronomers use to identify an astronomical object.
Object Description The type of astronomical object.
R.A. Position Right ascension – analogous to longitude – is one component of an object's position.
Dec. Position Declination – analogous to latitude – is one component of an object's position.
Constellation One of 88 recognized regions of the celestial sphere in which the object appears.
Distance The physical distance from Earth to the astronomical object. Distances within our solar system are usually measured in Astronomical Units (AU). Distances between stars are usually measured in light-years. Interstellar distances can also be measured in parsecs.
Dimensions The physical size of the object or the apparent angle it subtends on the sky.
About The Data
Data Description
  • Proposal: A description of the observations, their scientific justification, and the links to the data available in the science archive.
  • Science Team: The astronomers who planned the observations and analyzed the data. "PI" refers to the Principal Investigator.
Instrument The science instrument used to produce the data.
Exposure Dates The date(s) that the telescope made its observations and the total exposure time.
Filters The camera filters that were used in the science observations.
About The Image
Image Credit The primary individuals and institutions responsible for the content.
Publication Date The date and time the release content became public.
Color Info A brief description of the methods used to convert telescope data into the color image being presented.
Orientation The rotation of the image on the sky with respect to the north pole of the celestial sphere.