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	06^h 04^m 59.1292^s[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
Distance	approx. 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
Mass	0.4-4 M☉
Radius	18 R☉
Luminosity	1,900 L☉
Surface gravity (log g)	2.0 cgs
Temperature	9,000 K
M
Radius	110 R☉
Luminosity	1,200 L☉
Surface gravity (log g)	1.0 cgs
Temperature	3,250 K
Other designations
17 Lep, SS Leporis, SS Lep, BD−16 1349, HD 41511, HIP 28816, HR 2148, SAO 151093.[1]
Database references
SIMBAD	data

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. * 17 Lep -- Emission-line Star, database entry, SIMBAD. Accessed on line September 9, 2009.
2. 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. §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. 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. 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.