17 Leporis

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17 Leporis
Wide field SS Leporis.jpg
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]
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 Z And[2]
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]
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)
203.7 ± 0.4°
Semi-amplitude (K1)
6.1 ± 1.0 km/s
Semi-amplitude (K2)
21.32 ± 0.21 km/s
Mass0.4-4 M
Radius18 R
Luminosity1,900 L
Surface gravity (log g)2.0 cgs
Temperature9,000 K
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

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.


  1. ^ a b c d e f * 17 Lep -- Emission-line Star, database entry, SIMBAD. Accessed on line September 9, 2009.
  2. ^ a b c 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. ^ a b §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, Bibcode2007A&A...470L..21V.
  4. ^ a b c 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. ^ a b 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, Bibcode1995AJ....109..326W.
  6. ^ From apparent magnitude and parallax.
  7. ^ §1, Verhoelst, van Aarle, and Acke, 2007.