Diphda
Place on the Hertzsprung-Russell diagram
a giant · 113 times brighter than the Sun in visible light · 8 640 catalogue stars behind it
Your browser does not support WebGL, so the depth model is unavailable.Data
- Constellation
- Cetus
- Apparent magnitude
- 2.04
- Absolute magnitude
- -0.30
- Distance
- 96 light years
- Temperature
- 4 695 K
- Spectral class
- G9.5IIICH-1
- Proper motion
- 0.236 ″/ years
- Radial velocity
- 13 km/s
- Right ascension
- 10.8975 °
- Declination
- -17.9867 °
- Catalogue numbers
- HR 188 · HD 4128
№9044 / 9096
№5658 / 8923
№8390 / 8923
№6241 / 8786
№516 / 9092
Origin of the name
From the Arabic al-ḍifda‘ al-thānī, "the second frog"; the first was Fomalhaut.
What kind of star this is
A giant: the core hydrogen is spent, the star has swollen tens of times over and cooled at the surface while staying far brighter than the Sun — luminosity comes from area, not from temperature. Ahead of it lies the shedding of its outer layers as a planetary nebula, and a cooling core the size of the Earth: a white dwarf.