LSPM J0207+3331

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LSPM J0207+3331
White dwarf LSPM J0207+3331.jpg

Artist's impression
Credit: NASA’s Goddard Space Flight Center/Scott Wiessinger
Observation data
Epoch J2000      Equinox J2000
Constellation Triangulum
Right ascension  02h 07m 33.8059837915s
Declination +33 31 29.534350702
Parallax (π)22.44±0.20 mas
Distance44.5 pc
Mass0.69 M
Temperature6120 K
Other designations
2MASS J02073383+3331296, Gaia DR2 325899163483416704
Database references

LSPM J0207+3331 is, as of 2019, the oldest and coldest known white dwarf star to host a circumstellar disk, located 145 light-years from Earth.

It was discovered in October 2018 by a volunteer participating in the Backyard Worlds citizen science project.[1][2][3]

The star has a circumstellar disk despite being 3 billion years old. The infrared excess in the spectrum is consistent with two rings at different temperatures: an outer colder ring with a temperature of 480 K and an inner ring with a temperature between 550–1400 K. It may be a debris disk created from asteroids broken apart by the star's gravity.

This star has been studied with the Keck telescope and is the object of ongoing research. A paper has been accepted by The Astrophysical Journal Letters.[4]


  1. ^ "The Crystal Ball White Dwarf". 19 February 2019. Retrieved 22 February 2019.
  2. ^ "Volunteer Discovers Record-Setting White Dwarf Star". 19 February 2019. Retrieved 22 February 2019.
  3. ^ "Citizen Scientists Invited to Join Quest for New Worlds". NOAO. Retrieved 22 February 2019.
  4. ^ Debes, John H.; Thevenot, Melina; Kuchner, Marc; Burgasser, Adam; Schneider, Adam; Meisner, Aaron; Gagne, Jonathan; Faherty, Jaqueline K.; Rees, Jon M.; Allen, Michaela; Caselden, Dan; Cushing, Michael; Wisniewski, John; Allers, Katelyn; The Backyard Worlds: Planet 9 Collaboration; The Disk Detective Collaboration (2019). "A 3 Gyr White Dwarf with Warm Dust Discovered via the Backyard Worlds: Planet 9 Citizen Science Project". arXiv:1902.07073 [astro-ph.SR].