07201+2159 STF1066 (Wasat)

Coord 2000	07201+2159		Discov num	STF1066		Comp			Coord arcsec 2000	07 20 07.39 +21 58 56.4
Date first	1822		Date last	2018		Obs	273
Pa first	198		Pa last	229		P.A. Now (θ)	229°
Sep first	7.1		Sep last	5.5		Sep. Now (ρ)	5.5"
Mag pri	3.55		Mag sec	8.18		delta mag (ΔM)	4.63		Spectral class	A9III+K3V (white/yellow-orange)
Pri motion ra	-026		Sec motion ra
Pri motion dec	-012		Sec motion dec
Notes	N O (See Notes, Orbital solution)

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

Precise pa	228.9		Precise sep	5.541		Common name	Wasat		Meaning	the center of the sky
Other names	Wesat		Constellation	Gemini		SAO	79294		HIP	35550
Gaia DR2	1953646464		HD	56986		HR	2777		GC	9755
ADS	5983		GL	Gl 271A		BD	BD+22 1645		Bayer	Delta Geminorum
Bayer name	Del Gem		Flamsteed	55 Geminorum		Flamsteed name	55 Gem		Distance	18.54
Distance ly	60.48		last precise pa	228.9		last precise sep	5.541

Period (P)	2238.6001d (6.13y)		Periastron (T)	15466.5d (1901.222y)		Semi-major axis (a)	14.31m	± 16.41
Eccentricity (e)	0.353		Inclination (i)	92.4°	± 3.89	Longitude of periastron (ω)	214.6°
Node (Ω)	70.04°	± 9.45	Note			Grade	9	(1=Definitive, 9=Indet.)
Equinox			Last observation	1991

label rho theta 2000-01-01 0.005 75.6 2001-01-01 0.016 70.5 2002-01-01 0.018 69.0 2003-01-01 0.011 66.7 2004-01-01 0.001 296.2 2005-01-01 0.010 250.7 2006-01-01 0.002 81.0 2007-01-01 0.016 70.7 2008-01-01 0.018 69.2 2009-01-01 0.012 67.1 2010-01-01 0.001 36.1 2011-01-01 0.009 251.4 2012-01-01 169.9 2013-01-01 0.015 71.0 2014-01-01 0.018 69.4 2015-01-01 0.013 67.5 2016-01-01 0.003 55.3 2017-01-01 0.009 252.1 2018-01-01 0.003 240.9 2019-01-01 0.013 71.3 2020-01-01 0.018 69.5 2021-01-01 0.014 67.8 2022-01-01 0.004 60.6 2023-01-01 0.008 253.0 2024-01-01 0.005 245.9 2025-01-01 0.012 71.7 2026-01-01 0.018 69.7 2027-01-01 0.015 68.1 2028-01-01 0.006 63.1 2029-01-01 0.006 254.3 2030-01-01 0.007 247.8 Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

Period (P)	1418.4375y	± 625.7623	Periastron (T)	2150.9833y	± 47.4472	Semi-major axis (a)	7.76117a	± 2.62776
Eccentricity (e)	0.70913	± 0.24789	Inclination (i)	51.036°	± 13.893	Longitude of periastron (ω)	268.361°	± 11.904
Node (Ω)	70.828°	± 34.531	Note			Grade	5	(1=Definitive, 9=Indet.)
Equinox			Last observation	2013

label rho theta 2000 5.827 224.9 2001 5.812 225.1 2002 5.796 225.3 2003 5.781 225.5 2004 5.765 225.7 2005 5.750 225.9 2006 5.734 226.1 2007 5.718 226.3 2008 5.702 226.5 2009 5.686 226.7 2010 5.669 227.0 2011 5.653 227.2 2012 5.637 227.4 2013 5.620 227.6 2014 5.603 227.8 2015 5.586 228.0 2016 5.569 228.2 2017 5.552 228.5 2018 5.535 228.7 2019 5.517 228.9 2020 5.499 229.1 2021 5.482 229.4 2022 5.464 229.6 2023 5.446 229.8 2024 5.427 230.0 2025 5.409 230.3 2026 5.391 230.5 2027 5.372 230.7 2028 5.353 231.0 2029 5.334 231.2 2030 5.315 231.4 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
07201+2159	STF1066		2006	230	225	5.4	3.55	8.18	A9III K3V	NOD	072007.39+215856.4
07201+2159	STF1066		2009	232	226	5.6	3.55	8.18	A9III K3V	NOD	072007.39+215856.4
07201+2159	STF1066		2012	240	228	5.6	3.55	8.18	A9III K3V	NOD	072007.39+215856.4
07201+2159	STF1066		2013	254	230	5.6	3.55	8.18	A9III K3V	NOD	072007.39+215856.4
07201+2159	STF1066		2015	258	228	5.7	3.55	8.18	A9III+K3V	NO	072007.39+215856.4
07201+2159	STF1066		2016	267	230	5.5	3.55	8.18	A9III+K3V	NO	072007.39+215856.4
07201+2159	STF1066		2017	268	234	5.4	3.55	8.18	A9III+K3V	NO	072007.39+215856.4
07201+2159	STF1066		2018	273	229	5.5	3.55	8.18	A9III+K3V	NO	072007.39+215856.4

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