|
gptkbp:instance_of
|
gptkb:star
|
|
gptkbp:age
|
approximately 13 billion years
|
|
gptkbp:apparent_magnitude
|
9.4
yes
6.5
|
|
gptkbp:base_notes
|
best viewed in spring months
best viewed in binoculars or small telescopes.
|
|
gptkbp:contains
|
hundreds of thousands of stars
|
|
gptkbp:contains_star
|
low
yes
type II
type IV
|
|
gptkbp:declination
|
-1° 57' 00"
-1° 58' 30"
|
|
gptkbp:diameter
|
approximately 75 light years
|
|
gptkbp:discovered_by
|
gptkb:Charles_Messier
|
|
gptkbp:discovery_year
|
gptkb:1764
|
|
gptkbp:distance_from_earth
|
approximately 23,000 light years
|
|
gptkbp:exhibition
|
gptkb:Messier_Catalog
New General Catalogue (NGC)
|
|
gptkbp:has_color
|
0.95
B-V = 0.95
|
|
gptkbp:has_radius
|
approximately 2.5 arcminutes
approximately 3.5 arcminutes
|
|
gptkbp:has_spectral_type
|
varied
|
|
gptkbp:has_supernova
|
no
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Messier 12
|
|
gptkbp:is_associated_with
|
dark matter research
dark matter halo
|
|
gptkbp:is_located_at
|
Galactic coordinates (l, b) = (6.5°, -25.0°)
galactic coordinates (l, b) = (6.5°, -20.0°)
|
|
gptkbp:is_located_near
|
gptkb:Messier_10
|
|
gptkbp:is_observed_in
|
gptkb:Chandra_X-ray_Observatory
gptkb:Hubble_Space_Telescope
ground-based telescopes
|
|
gptkbp:is_part_of
|
gptkb:Milky_Way_Galaxy
Hercules constellation group
Milky Way halo
|
|
gptkbp:is_studied_for
|
stellar evolution
dynamics of globular clusters
|
|
gptkbp:is_studied_in
|
gptkb:astronomy
stellar dynamics
|
|
gptkbp:is_used_in
|
astrophysics research
stellar evolution studies
|
|
gptkbp:is_visible_from
|
gptkb:Earth
northern hemisphere
small telescopes
|
|
gptkbp:lighting
|
approximately 13.5 mag/arcsec²
|
|
gptkbp:located_in
|
constellation Ophiuchus
|
|
gptkbp:metallicity
|
[ Fe/ H] = -1.2
|
|
gptkbp:ngcnumber
|
gptkb:NGC_6218
|
|
gptkbp:population_density
|
high
approximately 100 stars per cubic parsec
|
|
gptkbp:right_ascension
|
16h 47m 14s
|
|
gptkbp:scope
|
gptkb:NGC_6218
|
|
gptkbp:type
|
gptkb:Population_II_star_cluster
|
|
gptkbp:bfsParent
|
gptkb:Messier_series
|
|
gptkbp:bfsLayer
|
7
|