T Leporis

T Leporis

T Leporis (below) compared to the Sun and Earth's orbit (above)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lepus
Right ascension 05h 04m 50.85s[1]
Declination −21° 54′ 16.5″[1]
Apparent magnitude (V) 7.4 - 14.3[2]
Characteristics
Spectral type M6e-M9e[2]
Variable type Mira[2]
Astrometry
Radial velocity (Rv)−4[3] km/s
Proper motion (μ) RA: +13.59 mas/yr[4]
Dec.: −34.55 mas/yr[4]
Parallax (π)3.06 ± 0.04 mas[4]
Distance1,066±13 ly
(327±4 pc)[4]
Details
Mass2.7[5] M☉
Radius204[4] R☉
Surface gravity (log g)−0.5[5] cgs
Temperature2,800[5] K
Other designations
T Lep, BD−22°995, CD−22°995, HD 32803, HIP 23636
Database references
SIMBADdata

T Leporis (T Lep / HD 32803 / HIP 23636) is a variable star in the constellation of Lepus, the Hare. It is located half a degree from ε Leporis in the sky; its distance is approximately 1,100 light years from the Solar System. It has the spectral type M6ev, and is a Mira variable — as is R Leporis, in the same constellation — whose apparent magnitude varies between +7.40 and +14.30 with a period of 368.13 days.[2]

The annual parallax of T Leporis was measured by the Hipparcos mission, but the results were hopelessly imprecise.[6] The parallax from Gaia Data Release 2 is more accurate and yields a distance of 340±20 pc.[1] The distance has also been measured using very-long-baseline interferometry and found to be 327±4 pc.[4]

The visual band light curve of T Leporis, from AAVSO data[7]

Mira variables are some of the major sources of molecules and dust in the Universe. With each pulsation, T Leporis expels matter into space, each year losing an amount equivalent to the mass of Earth. Images of T Leporis obtained with the Very Large Telescope interferometer of the European Southern Observatory (ESO) have revealed a shell of gas and dust surrounding the star, whose diameter is some 100 times larger than that of the Sun.[8] Given the great distance at which this class of stars lie, its apparent angular diameter — despite its enormous size — is no more than a millionth of the solar apparent angular diameter.

  1. ^ a b c Cite error: The named reference dr2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference gcvs was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference rv was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference nakagawa was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference perez-mesa was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference hipparcos was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference aavso was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference sciencedaily was invoked but never defined (see the help page).