gptkbp:instance_of
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gptkb:star
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gptkbp:associated_with
|
gptkb:Hercules_constellation
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gptkbp:conducts_research_on
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gptkb:Supernova
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gptkbp:contains_star
|
gptkb:main-sequence_star
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gptkbp:discovered_by
|
gptkb:NASA
|
gptkbp:discovery_year
|
gptkb:1971
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gptkbp:distance_from_earth
|
approximately 6,000 light years
|
gptkbp:first_appearance
|
1971 by the Uhuru satellite
|
gptkbp:has_pulsations
|
yes
|
gptkbp:has_radius
|
approximately 10 km
|
gptkbp:has_variations
|
yes
|
https://www.w3.org/2000/01/rdf-schema#label
|
Hercules X-4
|
gptkbp:is_a
|
gptkb:star
|
gptkbp:is_considered
|
a significant source of X-rays.
|
gptkbp:is_known_for
|
its strong X-ray emissions
|
gptkbp:is_observed_in
|
gptkb:Chandra_X-ray_Observatory
|
gptkbp:is_part_of
|
gptkb:Hercules_constellation
|
gptkbp:is_studied_in
|
astrophysics
multiple space telescopes
|
gptkbp:lighting
|
yes
around 10^37 erg/s
|
gptkbp:located_in
|
constellation Hercules
|
gptkbp:mass
|
approximately 1.4 solar masses
|
gptkbp:orbital_period
|
about 1.7 days
|
gptkbp:type
|
gptkb:X-ray_pulsar
|
gptkbp:bfsParent
|
gptkb:Hercules
|
gptkbp:bfsLayer
|
4
|