12270-0332 A 79 AB

Coord 2000	12270-0332		Discov num	A    79		Comp	AB		Coord arcsec 2000	12 27 00.77 -03 32 05.6
Date first	1900		Date last	2017		Obs	19
Pa first	90		Pa last	98.1		P.A. Now (θ)	98.1°
Sep first	0.4		Sep last	0.504		Sep. Now (ρ)	0.504"
Mag pri	8.89		Mag sec	10.03		delta mag (ΔM)	1.14		Spectral class	G5 (yellow)
Pri motion ra	+132		Sec motion ra
Pri motion dec	-095		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		138788	12 27 01 -03 32 06	A 79 AB	2017	19	98	0.5	8.89	10.03	1.14	Y	<===
Show		138788	12 27 01 -03 32 06	A 79 AB,C	2015	8	322	32.1	8.51	14.50	5.99
Show	HD 108361	138788	12 27 01 -03 32 06	HJ 210 AB,D	2015	22	146	24.8	8.51	10.20	1.69

Quadruple system
5 estimated visually detectable stars in this system

Constellation	Virgo		SAO	138788		HIP	60749		Tycho2	4944-00617-1
Gaia DR2	3693142837668713472		HD	108361		ADS	8552		BD	BD-02 3519
Distance	63.05		Distance ly	205.67

Period (P)	232y		Periastron (T)	1986.63y		Semi-major axis (a)	0.748a
Eccentricity (e)	0.962		Inclination (i)	100.4°		Longitude of periastron (ω)	250°
Node (Ω)	113.7°		Notes	n		Reference	Tok2017c
Equinox	2000		Last observation	2017		Grade	4	(1=Definitive, 9=Indet.)

label theta rho 2000 102.0 0.366 2001 101.7 0.377 2002 101.4 0.388 2003 101.1 0.398 2004 100.9 0.408 2005 100.6 0.417 2006 100.4 0.426 2007 100.1 0.435 2008 99.9 0.443 2009 99.7 0.451 2010 99.5 0.458 2011 99.3 0.465 2012 99.1 0.472 2013 98.9 0.479 2014 98.7 0.485 2015 98.5 0.491 2016 98.4 0.497 2017 98.2 0.502 2018 98.0 0.508 2019 97.9 0.513 2020 97.7 0.518 2021 97.5 0.523 2022 97.4 0.527 2023 97.2 0.532 2024 97.1 0.536 2025 96.9 0.540 2026 96.8 0.544 2027 96.6 0.548 2028 96.5 0.551 2029 96.4 0.555 2030 96.2 0.558		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic