01057+2128 YR 6 Aa,Ab

01^h 05^m 40.93^s +21° 28' 23.6" P.A. 312.00 sep 0.1 mag 5.70,6.60 Sp B9.5V dist. 84.32 pc (275.05 l.y.)

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)	140°
Sep first	0.1		Sep last	0.141		Sep. Now (ρ)	0.069"
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)

This double is physical.

01057+2128 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		74482	01 05 41 +21 28 24	YR 6 Aa,Ab	2017	21	312	0.1	5.70	6.60	0.90	Y	<===
Show	Psi1 Psc	74482	01 05 41 +21 28 24	STF 88 AB	2020	166	159	29.9	5.27	5.45	0.18
Show		74482	01 05 41 +21 28 24	STF 88 AC	2017	15	124	90.4	5.27	10.71	5.44
Show		74483	01 05 42 +21 27 56	STF 88 BC	2017	18	109	68.5	5.45	10.71	5.26

Quadruple system
3 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Var name	NSV397 Psc		Constellation	Pisces		SAO	74482		HIP	5131
Tycho2	1202-02124-1		Gaia DR2	2790497534190737152		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		Bayer greek	ψ¹ Psc

ORBITAL ELEMENTS

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	Notes	n		Reference	Hor2010
Equinox	2000		Last observation	2010		Grade	3	(1=Definitive, 9=Indet.)

label	theta	rho
2000	296.1	0.099
2001	301.2	0.119
2002	305.0	0.132
2003	308.3	0.139
2004	311.5	0.135
2005	315.3	0.117
2006	321.6	0.078
2007	10.0	0.016
2008	132.1	0.059
2009	145.6	0.068
2010	163.3	0.049
2011	204.2	0.032
2012	258.3	0.040
2013	282.4	0.064
2014	293.0	0.089
2015	299.2	0.111
2016	303.4	0.127
2017	306.9	0.137
2018	310.1	0.138
2019	313.5	0.127
2020	318.2	0.098
2021	331.0	0.045
2022	120.2	0.036
2023	140.0	0.069
2024	154.0	0.058
2025	181.7	0.038
2026	237.8	0.033
2027	274.5	0.053
2028	289.2	0.078
2029	296.8	0.102
2030	301.7	0.121

grafico orbita

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

wds01057%2B2128a.png orbit plot

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