|
gptkbp:instanceOf
|
gptkb:star
gptkb:Mira_variable
|
|
gptkbp:apparentMagnitude
|
3.5–10.9
|
|
gptkbp:constellation
|
gptkb:Hydra
|
|
gptkbp:declination
|
-23° 16′ 52″
|
|
gptkbp:diameter
|
400 solar radii
|
|
gptkbp:discoveredBy
|
gptkb:Gottfried_Kirch
|
|
gptkbp:discoveredIn
|
1704
|
|
gptkbp:distanceFromEarth
|
325 light-years
|
|
gptkbp:evolutionaryStage
|
asymptotic giant branch
|
|
gptkbp:luminosity
|
3,500 times Sun
|
|
gptkbp:mass
|
1.9 solar masses
|
|
gptkbp:metallicity
|
[Fe/H] ≈ 0.0
|
|
gptkbp:notableFor
|
period decrease observed since 1770s
|
|
gptkbp:otherDesignation
|
gptkb:SAO_181690
gptkb:2MASS_J13294270-2316521
gptkb:BD-22_3939
gptkb:HD_123657
gptkb:HIP_69112
gptkb:HR_5295
|
|
gptkbp:parallax
|
1.17 mas
10.04 mas
|
|
gptkbp:period
|
389 days
|
|
gptkbp:properMotionRA
|
-19.84 mas/yr
-62.13 mas/yr
|
|
gptkbp:radialVelocity
|
-10.5 km/s
|
|
gptkbp:rightAscension
|
13h 29m 42.7s
|
|
gptkbp:spectralType
|
M7IIIe
|
|
gptkbp:temperature
|
2,700 K
|
|
gptkbp:variableType
|
gptkb:Mira
|
|
gptkbp:bfsParent
|
gptkb:asymptotic_giant_branch_stars
|
|
gptkbp:bfsLayer
|
6
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
R Hydrae
|