Technical facts about this news release:
| About the Object |
| Object Name: |
M15 (NGC 7078) |
| Object Description: |
Globular Cluster in the Milky Way Galaxy |
| Position (J2000): |
R.A. 21h 29m 58s
Dec. +12° 10' 00" |
| Constellation: |
Pegasus |
| Distance: |
M15's distance to Earth is about 32,600 light-years (10 kiloparsecs). Its
distance to the galactic center of the Milky Way is about 34,000 light-years
(10.4 kiloparsecs). |
| Dimensions: |
The image is about 59 arcseconds (2.8 parsecs or 9.2 light-years) in the horizontal dimension. |
| Masses: |
Mass of the black hole: 4,000 times the mass of the Sun
Mass of the globular cluster: 600,000 times the mass of the Sun |
|
| About the Data |
| Instrument: |
WFPC2 |
STIS |
| Exposure Date(s): |
December 1998 |
October 1999, May/October 2001 |
| Exposure Time: |
3.7 hours |
16 hours |
| Principal Astronomers: |
H. E. Bond (STScI), D. R. Alves (Columbia Astrophysics Lab.), M.
Livio, L. K. Fullton and K. G. Schaefer (STScI) |
R. Van Der Marel and J. Gerssen (STScI), K. Gebhardt (U. Texas at
Austin), P. Guhathakurta and R. Peterson (UCO/Lick Observatory) and
C. Pryor (Rutgers U.) |
| Filters: |
F439W (B), F547M (Strömgren y), F502N ([O III]), F656N (H alpha),
F814W (I) |
G430M |
|
| About the Image |
| Image Credit: |
NASA and The Hubble Heritage Team (STScI/AURA) |
| Release Date: |
September 17, 2002 |
| Orientation: |
 |
|
| About the Object |
| Object Name: |
G1 in M31 (Mayall II) |
| Object Description: |
Globular Cluster in the Andromeda Galaxy |
| Position (J2000): |
R.A. 00h 32m 46.9m
Dec. +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. |
| Masses: |
Mass of the black hole: 20,000 times the mass of the Sun |
|
| About the Data |
| Instrument: |
WFPC2 |
STIS |
| Exposure Date(s): |
July 1994 |
October - November 2001 |
| Exposure Time: |
1.9 hours |
8.3 hours |
| Principal Astronomers: |
M. Rich (UCLA), K. Mighell (NOAO), and J. Neill (Columbia U.), and
W. Freedman (Carnegie Observatories) |
G430L, G750M |
| Filters: |
F555W (V), F814W (I) |
M. Rich (UCLA), K. Gebhardt (U. Texas at Austin), and L. Ho (Carnegie
Inst. of Washington) |
|
| About the Image |
| Image Credit: |
NASA and M. Rich (UCLA) |
| Release Date: |
September 17, 2002 12:00 noon (EDT) |
| Orientation: |
 |
|
