4U 1543-475

IL Lupi
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lupus
Right ascension 15h 47m 08.27687s[1]
Declination −47° 40′ 10.2846″[1]
Apparent magnitude (V) 11.96[2] (14.6 - 16.7)[3]
Characteristics
Evolutionary stage main sequence[4]
Spectral type A2 V + black hole[5]
Variable type XNG[3]
Astrometry
Proper motion (μ) RA: −7.543 mas/yr[1]
Dec.: −5.356 mas/yr[1]
Parallax (π)0.1909 ± 0.0551 mas[1]
Distanceapprox. 17,000 ly
(approx. 5,000 pc)
Details
donor star
Mass2.45±0.15[6] M☉
Radius2.84±0.11[5] R☉
Luminosity48±11[5] L☉
Surface gravity (log g)3.82[7] cgs
Temperature9,000±500[5] K
Metallicity [Fe/H]−0.11[8] dex
black hole
Mass9.4±2.0[9] M☉
Other designations
4U 1543-47, IL Lup, TIC 254732447, 2MASS J15470829-4740103[10]
Database references
SIMBADdata

4U 1543-475 is a recurrent X-ray transient[11] located in the southern constellation Lupus, the wolf. IL Lupi is its variable star designation. It has an apparent magnitude that fluctuates between 14.6 and 16.7, making it readily visible in large telescopes but not to the naked eye. The object is located relatively far at a distance of approximately 17,000 light years based on Gaia DR3 parallax measurements.

4U 1543-475 was first observed by Uhuru in 1971.[12] In 1976, 4U 1543-475's spectrum was observed. However, its status as a black hole binary had not been confirmed until 1984 by astronomer S. Kiamoto and colleagues.[13] After subsequent observations, it was given the variable star designation IL Lupi in 1995. 4U 1543-475 erupted three times.[citation needed]

  1. ^ a b c d Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Alfonso-Garzón2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Kolb1998 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Orosz1998 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Ritter2003 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Anders2022 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Ôzel2010 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Palombara was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Maltilsky1972 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Kiamoto1984 was invoked but never defined (see the help page).