17 Leporis

17 Leporis

Wide field around SS Leporis. The field of view is approximately 2.7 degrees.
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lepus
Right ascension 06h 04m 59.1292s[1]
Declination −16° 29′ 03.965″[1]
Apparent magnitude (V) 4.82 to 5.06 (combined)[2]
Characteristics
Spectral type A1II / M3–4.5III
(spectroscopic binary)[3]
U−B color index +0.12 (combined)[4]
B−V color index +0.24 (combined)[4]
R−I color index +0.52 (combined)[4]
Variable type ZAND[2]
Astrometry
Radial velocity (Rv)18.74 ± 0.10
(center of mass)[5] km/s
Proper motion (μ) RA: −5.57[1] mas/yr
Dec.: −3.17[1] mas/yr
Parallax (π)3.05 ± 0.67[1] mas
Distanceapprox. 1,100 ly
(approx. 330 pc)
Absolute magnitude (MV)−2.6 (combined)[6]
Orbit[5]
Period (P)260.34 ± 1.80 days
Eccentricity (e)0.024 ± 0.005
Periastron epoch (T)2448528.78 ± 0.37 HJD
Argument of periastron (ω)
(secondary)		203.7 ± 0.4°
Semi-amplitude (K1)
(primary)		6.1 ± 1.0 km/s
Semi-amplitude (K2)
(secondary)		21.32 ± 0.21 km/s
Details[3]
A
Mass0.4-4 M☉
Radius18 R☉
Luminosity1,900 L☉
Surface gravity (log g)2.0 cgs
Temperature9,000 K
M
Radius110 R☉
Luminosity1,200 L☉
Surface gravity (log g)1.0 cgs
Temperature3,250 K
Other designations
17 Lep, SS Leporis, SS Lep, BD−16 1349, HD 41511, HIP 28816, HR 2148, SAO 151093.[1]
Database references
SIMBADdata

17 Leporis (17 Lep, also SS Lep) is a spectroscopic binary star in the constellation of Lepus.[7] It has an overall apparent visual magnitude which varies between 4.82 and 5.06.[2]

This zoom sequence starts with a broad view of the spectacular Milky Way. It then closes in on the small constellation of Lepus (The Hare) and finally focuses on 17 Lep.

References

  1. 1 2 3 4 5 6 * 17 Lep -- Emission-line Star, database entry, SIMBAD. Accessed on line September 9, 2009.
  2. 1 2 3 SS Lep, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 9, 2009.
  3. 1 2 §3.1, Direct diameter measurement of a star filling its Roche lobe. The semi-detached binary SS Leporis spatially resolved with VINCI/VLTI, T. Verhoelst, E. van Aarle, and B. Acke, Astronomy and Astrophysics 470, #3 (August 2007), pp. L21–L24, doi:10.1051/0004-6361:20077840, Bibcode: 2007A&A...470L..21V.
  4. 1 2 3 HR 2148, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 9, 2009.
  5. 1 2 Table 2, On the nature of 17 Leporis, Alan D. Welty and Richard A. Wade, The Astronomical Journal 109, #1669 (January 1995), pp. 326–331, doi:10.1086/117276, Bibcode: 1995AJ....109..326W.
  6. ↑ From apparent magnitude and parallax.
  7. ↑ §1, Verhoelst, van Aarle, and Acke, 2007.
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