08549+2612 A  2131AB

Coord 2000	08549+2612		Discov num	A  2131		Comp	AB		Coord arcsec 2000	08 54 55.99 +26 11 53.8
Date first	1910		Date last	2008		Obs	93
Pa first	255		Pa last	294		P.A. Now (θ)	131.1°
Sep first	0.3		Sep last	0.3		Sep. Now (ρ)	0.2"
Mag pri	6.95		Mag sec	9.02		delta mag (ΔM)	2.07		Spectral class	G2V+K0V (yellow/yellow-orange)
Pri motion ra	+061		Sec motion ra	+054
Pri motion dec	-451		Sec motion dec	-441
Notes	N O (See Notes, Orbital solution)

rPM=0.027 (< 0.3, Physical double) This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		80503	08 54 56 +26 11 54	A 2131 AB	2008	93	131	0.2	6.95	9.02	2.07	Y	<===
Show		80503	08 54 56 +26 11 54	HO 357 AB,C	2011	8	359	83.3	6.75	13.66	6.91

Triple system
4 visible stars in this system

Precise pa	293.8		Precise sep	0.348		Constellation	Hydra		SAO	80503
HIP	43766		Tycho2	1946-01937-1		HD	76095		ADS	7082
BD	BD+26 1865		Distance	49.02		Distance ly	159.9		last precise pa	293.8
last precise sep	0.348

Period (P)	45.02y		Periastron (T)	1973.16y		Semi-major axis (a)	0.347a
Eccentricity (e)	0.475		Inclination (i)	43.5°		Longitude of periastron (ω)	257.5°
Node (Ω)	162.1°		Note			Grade	2	(1=Definitive, 9=Indet.)
Equinox			Last observation	1997

label rho theta 2000 0.361 254.5 2001 0.357 259.3 2002 0.353 264.2 2003 0.349 269.1 2004 0.345 274.2 2005 0.341 279.4 2006 0.337 284.8 2007 0.332 290.3 2008 0.327 295.9 2009 0.321 301.8 2010 0.313 307.9 2011 0.303 314.4 2012 0.291 321.4 2013 0.275 329.0 2014 0.254 337.8 2015 0.228 348.4 2016 0.197 2.0 2017 0.163 21.2 2018 0.137 49.1 2019 0.136 83.3 2020 0.162 111.8 2021 0.198 131.1 2022 0.236 144.2 2023 0.269 153.9 2024 0.297 161.5 2025 0.321 168.0 2026 0.340 173.6 2027 0.356 178.6 2028 0.368 183.3 2029 0.378 187.7 2030 0.385 192.0		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
08549+2612	A 2131	AB	1997	89	244	0.4	6.95	9.02	G2V+K0V	NOD	085455.95+261157.8
08549+2612	A 2131	AB	2005	91	281	0.4	6.95	9.02	G2V+K0V	NOD	085455.95+261157.8
08549+2612	A 2131	AB	2008	92	294	0.3	6.95	9.02	G2V K0V	NOD	085455.95+261157.8

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