02020+0246 STF 202AB (Alrisha)

Coord 2000	02020+0246		Discov num	STF 202		Comp	AB		Coord arcsec 2000	02 02 02.80 +02 45 49.4
Date first	1779		Date last	2017		Obs	621
Pa first	337		Pa last	265		P.A. Now (θ)	261.4°
Sep first	5.1		Sep last	1.9		Sep. Now (ρ)	1.84"
Mag pri	4.10		Mag sec	5.17		delta mag (ΔM)	1.07		Spectral class	A0p+A3m (white/white)
Pri motion ra	+042		Sec motion ra	+042
Pri motion dec	-011		Sec motion dec	-011
Notes	N O (See Notes, Orbital solution)

This double is physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	Alrisha	110291	02020+0246	STF 202	AB	1779	2017	621	261	1.8	4.10	5.17	1.07	Y	<===
Show		110291	02020+0246	PWL 1	AC	1856	2006	9	63	404.9	4.10	8.25	4.15
Show		110291	02020+0246	PWL 1	AD	1856	2006	9	335	434.5	4.10	8.59	4.49

Quadruple system
4 visible stars in this system

Precise pa	264.5		Precise sep	1.941		Common name	Alrisha		Meaning	cords, tapes
Other names	ALRISCHA, OKDA, KAITAIN		Constellation	Pisces		SAO	110291		HIP	9487
Tycho2	0040-01338-1		HD	12446		HR	595		GC	2452
ADS	1615		BD	BD+02 317		Bayer	Alpha Piscium		Bayer name	Alp Psc
Flamsteed	113 Piscium		Flamsteed name	113 Ps		Distance	46.17		Distance ly	150.61
last precise pa	264.5		last precise sep	1.941

Period (P)	3267.4y		Periastron (T)	2188.6y		Semi-major axis (a)	7.4a
Eccentricity (e)	0.465		Inclination (i)	113.4°		Longitude of periastron (ω)	147.9°
Node (Ω)	3.7°		Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2015

label rho theta 2000 1.843 272.8 2001 1.841 272.1 2002 1.839 271.5 2003 1.838 270.9 2004 1.836 270.3 2005 1.835 269.6 2006 1.834 269.0 2007 1.833 268.4 2008 1.832 267.7 2009 1.831 267.1 2010 1.831 266.5 2011 1.831 265.8 2012 1.831 265.2 2013 1.831 264.6 2014 1.831 263.9 2015 1.832 263.3 2016 1.833 262.7 2017 1.834 262.0 2018 1.835 261.4 2019 1.836 260.8 2020 1.838 260.1 2021 1.839 259.5 2022 1.841 258.9 2023 1.843 258.3 2024 1.846 257.6 2025 1.848 257.0 2026 1.851 256.4 2027 1.854 255.8 2028 1.857 255.2 2029 1.860 254.6 2030 1.863 253.9 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
02020+0246	STF 202	AB	2007	588	269	1.8	4.10	5.17	A0p A3m	NOD	020202.80+024549.4
02020+0246	STF 202	AB	2008	592	269	1.9	4.10	5.17	A0p A3m	NOD	020202.80+024549.4
02020+0246	STF 202	AB	2009	597	268	1.8	4.10	5.17	A0p A3m	NOD	020202.80+024549.4
02020+0246	STF 202	AB	2010	608	267	1.8	4.10	5.17	A0p A3m	NOD	020202.80+024549.4
02020+0246	STF 202	AB	2011	610	266	1.9	4.10	5.17	A0p A3m	NOD	020202.80+024549.4
02020+0246	STF 202	AB	2012	615	266	1.7	4.10	5.17	A0p A3m	NOD	020202.80+024549.4
02020+0246	STF 202	AB	2014	620	263	1.6	4.10	5.17	A0p A3m	NOD	020202.80+024549.4
02020+0246	STF 202	AB	2015	616	264	1.8	4.10	5.17	A0p+A3m	NO	020202.80+024549.4
02020+0246	STF 202	AB	2016	619	265	1.8	4.10	5.17	A0p+A3m	NO	020202.80+024549.4
02020+0246	STF 202	AB	2017	621	265	1.9	4.10	5.17	A0p+A3m	NO	020202.80+024549.4

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