01057+2128 YR    6Aa,Ab

Coord 2000	01057+2128		Discov num	YR    6		Comp	Aa,Ab		Coord arcsec 2000	01 05 40.93 +21 28 23.6
Date first	1999		Date last	2017		Obs	21
Pa first	289		Pa last	312		P.A. Now (θ)	318.2°
Sep first	0.1		Sep last	0.1		Sep. Now (ρ)	0.1"
Mag pri	5.70		Mag sec	6.60		delta mag (ΔM)	0.9		Spectral class	B9.5V (blue-white)
Pri motion ra	+044		Sec motion ra
Pri motion dec	-014		Sec motion dec
Notes	N O (See Notes, Orbital solution)

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

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		74482	01057+2128	YR 6	Aa,Ab	1999	2017	21	318	0.1	5.70	6.60	0.90	Y	<===
Show	Psi1 Psc	74482	01057+2128	STF 88	AB	1755	2018	165	159	29.8	5.27	5.45	0.18
Show		74482	01057+2128	STF 88	AC	1891	2017	15	124	90.4	5.27	10.71	5.44
Show		74483	01057+2128	STF 88	BC	1881	2017	18	109	68.5	5.45	10.71	5.26

Quadruple system
3 visible stars in this system

Precise pa	312		Precise sep	0.141		Constellation	Pisces		SAO	74482
HIP	5131		Tycho2	1202-02124-1		Gaia DR2	34190737152		HD	6456
HR	310		GC	1309		ADS	899		BD	BD+20 156
Bayer	Psi 1 Piscium		Bayer name	Psi1 Psc		Flamsteed	74 Piscium		Flamsteed name	74 Psc
Distance	84.32		Distance ly	275.05		last precise pa	312		last precise sep	0.141

Period (P)	14.44y	± 0.26	Periastron (T)	2007.512y	± 0.041	Semi-major axis (a)	0.1143a	± 0.0017
Eccentricity (e)	0.519	± 0.027	Inclination (i)	77.43°	± 0.81	Longitude of periastron (ω)	305.4°	± 2.3
Node (Ω)	134.8°	± 1.2	Note			Grade	3	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2010

label rho theta 2000 0.099 296.1 2001 0.119 301.2 2002 0.132 305.0 2003 0.139 308.3 2004 0.135 311.5 2005 0.117 315.3 2006 0.078 321.6 2007 0.016 10.0 2008 0.059 132.1 2009 0.068 145.6 2010 0.049 163.3 2011 0.032 204.2 2012 0.040 258.3 2013 0.064 282.4 2014 0.089 293.0 2015 0.111 299.2 2016 0.127 303.4 2017 0.137 306.9 2018 0.138 310.1 2019 0.127 313.5 2020 0.098 318.2 2021 0.045 331.0 2022 0.036 120.2 2023 0.069 140.0 2024 0.058 154.0 2025 0.038 181.7 2026 0.033 237.8 2027 0.053 274.5 2028 0.078 289.2 2029 0.102 296.8 2030 0.121 301.7 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
01057+2128	YR 6	Aa,Ab	2005	6	319	0.1	5.32		A1V	D	010540.93+212823.6
01057+2128	YR 6	Aa,Ab	2007	7	311	0.1	5.70	6.60	A1V	D	010540.93+212823.6
01057+2128	YR 6	Aa,Ab	2010	8	343	0.0	5.70	6.60	A1V	NOD	010540.93+212823.6
01057+2128	YR 6	Aa,Ab	2014	13	298	0.1	5.70	6.60	B9.5V	NO	010540.93+212823.6
01057+2128	YR 6	Aa,Ab	2017	21	312	0.1	5.70	6.60	B9.5V	NO	010540.93+212823.6

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