R Doradus

Starbox begin
name=R Doradus A / B / CStarbox image


caption = R Doradus Starbox observe
epoch=J2000
ra=04h 36m 45.5923s
dec=-62° 04' 37.756"'
appmag_v=5.73 / 11.9 / 11
constell=Dorado Starbox character
class=M8III
b-v=1.58
u-b=0.86
variable=Mira, pulsating variable star Starbox astrometry
radial_v=26.1
prop_mo_ra=-68.46
prop_mo_dec= -71.22
gal_lat=-39.3424
gal_lon=272.6714
parallax=16.02
p_error=0.69
absmag_v=6.97 Starbox visbin
name=R Doradus B
period=
axis=38.4
eccentricity=
inclination=13
node=
periastron= Starbox visbin
name=R Doradus C
period=
axis=34.5
eccentricity=
inclination=124
node=
periastron= Starbox detail
mass=?
radius=185 ± 25
luminosity=6500 ± 1400
temperature=2740 ± 190
metal=?
gravity=?
rotation= 340 days
age=? Starbox catalog
names= R Dor, GC 5661, HR 1492, P Dor, GCRV 2726, IDS 04356-6216 A, TYC 8880-1071-1, CCDM J04368-6205A, IRAS 04361-6210, UBV M 10273, CD-62° 175, GSC 08880-01071, JP11 913, CPC 20.1 1002, HD 29712, N30 980, CPD-62° 372, HIC 21479, PPM 354226, AAVSO 0435-62, CSI-62° 372 41, HIP 21479, SAO 249066, HJ 3679. Starbox reference
Simbad=HD+29712

R Doradus (also called HD 29712) is the name of a red giant Mira variable star in the far-southern constellation Dorado, although visually it appears more closely associated with the constellation Reticulum. Its distance from Earth is 200 ± 25 light-years. Having an angular diameter of 0.057 ± 0.005 arcsec, and given its distance, it is currently believed to be the star with the largest apparent size as viewed from Earth (except for the sun). The diameter of R Doradus is 515 ± 70 million km or 370 ± 50 times the diameter of the Sun. If placed at the center of the Solar System, the orbit of Mars would be entirely contained within the star.

The visible magnitude of R Doradus varies between 4.8 and 6.6, which makes it just about visible to the naked eye, but in the infrared it is one of the brightest stars in the sky. Thus, even though its mass is about one solar mass, its total luminosity is 6500 ± 1400 times that of the sun. [cite press release | title=THE BIGGEST STAR IN THE SKY | publisher=European Southern Observatory | date=1997-03-11 | url=http://www.eso.org/outreach/press-rel/pr-1997/pr-05-97.html | accessdate=2006-09-05]

Notes

External links

* http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1997MNRAS.286..957B&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf
* http://www.alcyone.de/SIT/bsc/HR1492.html
* [http://astronomy.swin.edu.au/sao/SAO_Observers/RDor.html Swinburne Astronomy Online; information about R Doradus]
* [http://www.exn.ca/Stories/1997/03/11/03.asp Photograph courtesy of DiscoveryChannel.com]
* http://www.geocities.com/argonavisbr/binoculares.htm
* http://www.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aa/full/2002/18/aah3178/aah3178.right.html
* http://tomsastroblog.com/?p=1003