20320+2548 STF2695

Coord 2000	20320+2548		Discov num	STF2695		Comp			Coord arcsec 2000	20 31 58.19 +25 48 18.1
Date first	1830		Date last	2016		Obs	141
Pa first	79		Pa last	259		P.A. Now (θ)	257.8°
Sep first	0.8		Sep last	0.4		Sep. Now (ρ)	0.44"
Mag pri	6.58		Mag sec	8.75		delta mag (ΔM)	2.17		Spectral class	Am+A2 (white/white)
Pri motion ra	+035		Sec motion ra
Pri motion dec	-016		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

Precise pa	259.4		Precise sep	0.381		Constellation	Vulpecula		SAO	88808
HIP	101300		Tycho2	2161-00330-1		Gaia DR2	91159294208		HD	195692
HR	7849		ADS	13964		BD	BD+25 4272		Distance	87.03
Distance ly	283.89		last precise pa	259.4		last precise sep	0.381

Period (P)	269y		Periastron (T)	2016.37y		Semi-major axis (a)	0.773a
Eccentricity (e)	0.431		Inclination (i)	84.1°		Longitude of periastron (ω)	174.1°
Node (Ω)	77.4°		Note			Grade	3	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2004

label rho theta 2000 0.247 246.8 2001 0.265 247.9 2002 0.282 248.9 2003 0.298 249.8 2004 0.314 250.6 2005 0.330 251.3 2006 0.344 251.9 2007 0.358 252.5 2008 0.371 253.1 2009 0.383 253.6 2010 0.394 254.1 2011 0.404 254.6 2012 0.413 255.0 2013 0.421 255.4 2014 0.427 255.9 2015 0.432 256.3 2016 0.436 256.6 2017 0.439 257.0 2018 0.441 257.4 2019 0.441 257.8 2020 0.440 258.2 2021 0.437 258.6 2022 0.434 259.0 2023 0.429 259.4 2024 0.423 259.8 2025 0.416 260.2 2026 0.408 260.6 2027 0.399 261.1 2028 0.389 261.6 2029 0.378 262.1 2030 0.366 262.6 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
20320+2548	STF2695		2004	135	248	0.3	6.58	8.75	Am+A2	NOD	203158.19+254818.1
20320+2548	STF2695		2016	141	259	0.4	6.58	8.75	Am+A2	NO	203158.19+254818.1

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