11239+1032 STF 1536 AB (Tsze tseang)

11^h 23^m 55.37^s +10° 31' 46.9" P.A. 92.00 sep 2.3 mag 4.06,6.71 Sp F4IV dist. 23.67 pc (77.21 l.y.)

Coord 2000	11239+1032		Discov num	STF1536		Comp	AB		Coord arcsec 2000	11 23 55.37 +10 31 46.9
Date first	1827		Date last	2021		Obs	555
Pa first	95		Pa last	91.7		P.A. Now (θ)	90.1°
Sep first	3.0		Sep last	2.275		Sep. Now (ρ)	2.284"
Mag pri	4.06		Mag sec	6.71		delta mag (ΔM)	2.65		Spectral class	F4IV (yellow-white)
Pri motion ra	+153		Sec motion ra	+153
Pri motion dec	-065		Sec motion dec	-065
Notes	N O (See Notes, Orbital solution)

This double is physical.

11239+1032 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	Tsze tseang	99587	11 23 55 +10 31 47	STF 1536 AB	2021	555	92	2.3	4.06	6.71	2.65	Y	<===
Show		99587	11 23 55 +10 31 47	STF 1536 AB,C	2015	7	346	332.1	4.06	11.06	7.00

Triple system
4 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Common name	Tsze tseang		Var name	NSV5184 Leo		Constellation	Leo		SAO	99587
HIP	55642		Tycho2	0858-01221-1		Gaia DR2	3915612630249291008		HD	99028
HR	4399		GC	15652		ADS	8148		BD	BD+11 2348
Bayer	Iota Leonis		Bayer name	Iot Leo		Flamsteed	78 Leonis		Flamsteed name	78 Leo
Distance	23.67		Distance ly	77.21		Bayer greek	ι Leo

Meaning

General seconds

ORBITAL ELEMENTS

Period (P)	184.4572y	± 1.3275	Periastron (T)	1948.3626y	± 0.2117	Semi-major axis (a)	1.91525a	± 0.0155
Eccentricity (e)	0.53689	± 0.00459	Inclination (i)	127.642°	± 0.598	Longitude of periastron (ω)	142.829°	± 0.878
Node (Ω)	54.376°	± 0.846	Notes	n		Reference	Izm2019
Equinox			Last observation	2014		Grade	2	(1=Definitive, 9=Indet.)

label	theta	rho
2000	111.7	1.700
2001	110.4	1.728
2002	109.2	1.756
2003	108.0	1.783
2004	106.9	1.811
2005	105.8	1.838
2006	104.7	1.865
2007	103.6	1.893
2008	102.6	1.919
2009	101.6	1.946
2010	100.7	1.972
2011	99.7	1.998
2012	98.8	2.024
2013	97.9	2.050
2014	97.1	2.075
2015	96.2	2.100
2016	95.4	2.124
2017	94.6	2.148
2018	93.8	2.172
2019	93.0	2.195
2020	92.3	2.218
2021	91.5	2.241
2022	90.8	2.263
2023	90.1	2.284
2024	89.4	2.306
2025	88.7	2.326
2026	88.0	2.347
2027	87.4	2.366
2028	86.7	2.386
2029	86.1	2.405
2030	85.4	2.423

grafico orbita

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.

wds11239%2B1032c.png orbit plot

Measures: green=micrometric, blue=interferometric, purple=photographic