About: Ross 640

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Ross 640 is a white dwarf star in the northern constellation of Hercules, positioned near the constellation border with Corona Borealis. With an apparent visual magnitude of 13.83, it is too faint to be visible to the naked eye. Its trigonometric parallax from the Gaia mission is 62.9″, corresponding to a distance of 52 light-years (15.9 parsecs).

Attributes	Values
rdf:type	Thing place dbo:Location schema:Place celestial body star
rdfs:label	Ross 640 (en) Ross 640 (sv)
rdfs:comment	Ross 640 is a white dwarf star in the northern constellation of Hercules, positioned near the constellation border with Corona Borealis. With an apparent visual magnitude of 13.83, it is too faint to be visible to the naked eye. Its trigonometric parallax from the Gaia mission is 62.9″, corresponding to a distance of 52 light-years (15.9 parsecs). (en)
dcterms:subject	Gliese and GJ objects Hercules (constellation) White dwarfs Ross objects
Wikipage page ID	59527925 (xsd:integer)
Wikipage revision ID	1013780865 (xsd:integer)
Link from a Wikipage to another Wikipage	Metallicity Stellar classification Gliese and GJ objects Hercules (constellation) White dwarfs Constellation Corona Borealis Effective temperature Gaia (spacecraft) Star Compact star White dwarf Ross objects Hercules (constellation) J2000.0 Apparent visual magnitude Absorption line Balmer lines Trigonometric parallax
sameAs	Ross 640 Ross 640 Ross 640
dbp:wikiPageUsesTemplate	dbt:Convert dbt:Reflist dbt:Short_description dbt:Sky dbt:Starbox_astrometry dbt:Starbox_begin dbt:Starbox_catalog dbt:Starbox_character dbt:Starbox_detail dbt:Starbox_end dbt:Starbox_observe dbt:Starbox_reference dbt:Stars_of_Hercules dbt:Val dbt:DEC dbt:Odlist dbt:RA
absmag v	+13.01 (en)
age gyr	1.020000 (xsd:double)
appmag v	13.830000 (xsd:double)
class	DZA5.5 (en)
constell	Hercules (constellation)
epoch	J2000.0
gravity	7.760000 (xsd:double)
luminosity	0.000700 (xsd:double)
p error	0.022300 (xsd:double)
parallax	62.914700 (xsd:double)
prop mo dec	+746.554 (en)
prop mo ra	−494.185 (en)
temperature	8100 (xsd:integer)
type	white dwarf (en)
has abstract	Ross 640 is a white dwarf star in the northern constellation of Hercules, positioned near the constellation border with Corona Borealis. With an apparent visual magnitude of 13.83, it is too faint to be visible to the naked eye. Its trigonometric parallax from the Gaia mission is 62.9″, corresponding to a distance of 52 light-years (15.9 parsecs). This compact star has a stellar classification of DZA5.5, indicating a metal-rich atmosphere accompanied by weaker lines of hydrogen. A detailed analysis of its spectrum revealed that Ross 640 is a relatively cool white dwarf with an effective temperature of approximately 8,100 K, which means that it has been in the white dwarf phase for slightly more than 1 billion years. Ross 640 has a spectrum characterized by hydrogen Balmer lines in the visible and very strong ionized magnesium lines in the ultraviolet. The presence of heavy elements in the photosphere of Ross 640 indicates that it recently accreted rocky debris from its planetary system. (en)
prov:wasDerivedFrom	wikipedia-en:Ross_640?oldid=1013780865&ns=0
page length (characters) of wiki page	5770 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Ross_640
is Link from a Wikipage to another Wikipage of	List of star systems within 50–55 light-years
is foaf:primaryTopic of	wikipedia-en:Ross_640

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