15351-4110 HJ 4786 AB (Gam Lup)

15^h 35^m 08.41^s -41° 10' 00.4" P.A. 275.00 sep 0.8 mag 3.44,3.54 Sp B2IV dist. 129.03 pc (420.9 l.y.)

Coord 2000	15351-4110		Discov num	HJ 4786		Comp	AB		Coord arcsec 2000	15 35 08.41 -41 10 00.4
Date first	1835		Date last	2021		Obs	118
Pa first	94		Pa last	275		P.A. Now (θ)	275°
Sep first	0.8		Sep last	0.834		Sep. Now (ρ)	0.834"
Mag pri	3.44		Mag sec	3.54		delta mag (ΔM)	0.1		Spectral class	B2IV (blue-white)
Pri motion ra	-028		Sec motion ra	-028
Pri motion dec	-042		Sec motion dec	-042
Notes	N O (See Notes, Orbital solution)

This double is physical.

15351-4110 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	Gam Lup	225938	15 35 08 -41 10 00	HJ 4786 AB	2021	118	275	0.8	3.44	3.54	0.10	Y	<===
Show		225938	15 35 08 -41 10 00	RIZ 15 AC	1999	1	210	39.1	3.44	17.00	13.56
Show		225938	15 35 08 -41 10 00	RIZ 15 AD	1999	1	292	53.4	3.44	16.40	12.96

Quadruple system
4 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Name	Gam Lup		Constellation	Lupus		SAO	225938		HIP	76297
Tycho2	7840-01432-1		HD	138690		HR	5776		GC	20926
CD	CD-40 9760		CP	CP-40 7042		Bayer	Gamma Lupi		Bayer name	Gam Lup
Distance	129.03		Distance ly	420.9		Bayer greek	γ Lup

ORBITAL ELEMENTS

Period (P)	190y		Periastron (T)	1885y		Semi-major axis (a)	0.655a
Eccentricity (e)	0.51		Inclination (i)	95°		Longitude of periastron (ω)	311.5°
Node (Ω)	94.6°		Notes	n		Reference	Hei1990c
Equinox	2000		Last observation	1988		Grade	4	(1=Definitive, 9=Indet.)

label	theta	rho
2000	277.9	0.796
2001	277.9	0.800
2002	277.8	0.804
2003	277.7	0.807
2004	277.6	0.811
2005	277.5	0.814
2006	277.4	0.817
2007	277.3	0.819
2008	277.2	0.821
2009	277.1	0.823
2010	277.0	0.825
2011	276.9	0.826
2012	276.8	0.827
2013	276.8	0.827
2014	276.7	0.827
2015	276.6	0.827
2016	276.5	0.826
2017	276.4	0.826
2018	276.3	0.824
2019	276.2	0.823
2020	276.1	0.821
2021	276.0	0.818
2022	276.0	0.815
2023	275.9	0.812
2024	275.8	0.808
2025	275.7	0.804
2026	275.6	0.799
2027	275.5	0.794
2028	275.4	0.789
2029	275.3	0.783
2030	275.2	0.776

grafico orbita

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.

wds15351-4110a.png orbit plot

Measures: green=micrometric, blue=interferometric, purple=photographic