19394+2215 STF2556

Coord 2000	19394+2215		Discov num	STF2556		Comp			Coord arcsec 2000	19 39 26.31 +22 15 23.4
Date first	1829		Date last	2018		Obs	200
Pa first	188		Pa last	335		P.A. Now (θ)	337.9°
Sep first	0.6		Sep last	0.4		Sep. Now (ρ)	0.38"
Mag pri	7.71		Mag sec	8.92		delta mag (ΔM)	1.21		Spectral class	F4IV (yellow-white)
Pri motion ra	+003		Sec motion ra	+003
Pri motion dec	+013		Sec motion dec	+013
Notes	O (Orbital solution)

Visually invisible, K-band or other infrared star This double is physical.

Precise pa	335.1		Precise sep	0.421		Constellation	Vulpecula		SAO	87508
HIP	96691		Tycho2	1614-00138-1		HD	185661		ADS	12752
BD	BD+21 3862		Distance	147.28		Distance ly	480.43		last precise pa	335.1
last precise sep	0.421

Period (P)	622.4y		Periastron (T)	1970.31y		Semi-major axis (a)	0.678a
Eccentricity (e)	0.476		Inclination (i)	140.9°		Longitude of periastron (ω)	356°
Node (Ω)	44.5°		Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	1997

label rho theta 2000 0.358 5.3 2001 0.358 3.8 2002 0.359 2.4 2003 0.359 1.0 2004 0.359 359.6 2005 0.360 358.2 2006 0.360 356.8 2007 0.361 355.4 2008 0.362 354.0 2009 0.363 352.6 2010 0.363 351.3 2011 0.364 349.9 2012 0.365 348.5 2013 0.366 347.2 2014 0.367 345.8 2015 0.368 344.5 2016 0.370 343.2 2017 0.371 341.8 2018 0.372 340.5 2019 0.374 339.2 2020 0.375 337.9 2021 0.377 336.6 2022 0.379 335.4 2023 0.380 334.1 2024 0.382 332.9 2025 0.384 331.6 2026 0.386 330.4 2027 0.388 329.2 2028 0.390 328.0 2029 0.392 326.8 2030 0.395 325.6 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
19394+2215	STF2556		2007	198	348	0.4	7.71	8.92	F4IV	NOD	193926.31+221523.4
19394+2215	STF2556		2008	201	352	0.4	7.71	8.92	F4IV	NOD	193926.31+221523.4
19394+2215	STF2556		2012	203	349	0.4	7.71	8.92	F4IV	NOD	193926.31+221523.4
19394+2215	STF2556		2018	199	335	0.4	7.71	8.92	F4IV	O	193926.31+221523.4

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