00174+0853 A  1803AB (38 Hya)

Coord 2000	00174+0853		Discov num	A  1803		Comp	AB		Coord arcsec 2000	00 17 24.50 +08 52 34.8
Date first	1908		Date last	2008		Obs	53
Pa first	300		Pa last	307		P.A. Now (θ)	197°
Sep first	0.1		Sep last	0.2		Sep. Now (ρ)	0.02"
Mag pri	8.38		Mag sec	7.78		delta mag (ΔM)	0.6		Spectral class	F7V (yellow-white)
Pri motion ra	+063		Sec motion ra
Pri motion dec	+061		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	38 Psc		00 17 24 +08 52 35	A 1803 AB	2008	53	197	0.0	8.38	7.78	0.60	Y	<===
Show			00 17 24 +08 52 35	STF 22 AB,C	2020	175	234	3.9	7.13	7.66	0.53
Show			00 17 24 +08 52 35	STF 22 AB,D	2005	10	151	66.8	7.13	11.50	4.37
Show			00 17 24 +08 52 35	POP 229 AB,E	2005	3	239	75.3	7.13	16.16	9.03

Quintuple system
6 visible stars in this system

Precise pa	307.2		Precise sep	0.162		Name	38 Hya		Constellation	Hydra
HIP	1392		Gaia DR2	2752315446728243328		HD	1317		GC	340
ADS	238		BD	BD+08 24		Flamsteed	38 Hydrae		Flamsteed name	38 Hya
Distance	15.19		Distance ly	49.55		last precise pa	307.2		last precise sep	0.162

Period (P)	35.66y		Periastron (T)	1950.7y		Semi-major axis (a)	0.189a
Eccentricity (e)	0.002		Inclination (i)	95.4°		Longitude of periastron (ω)	282°
Node (Ω)	124.1°		Note			Grade	2	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2008

label rho theta 2000 0.096 114.9 2001 0.067 109.7 2002 0.037 96.1 2003 0.018 33.7 2004 0.038 332.0 2005 0.067 318.5 2006 0.096 313.3 2007 0.123 310.4 2008 0.146 308.6 2009 0.165 307.2 2010 0.178 306.0 2011 0.187 305.0 2012 0.189 304.0 2013 0.186 303.1 2014 0.177 302.1 2015 0.162 300.9 2016 0.143 299.4 2017 0.119 297.4 2018 0.092 294.4 2019 0.063 288.5 2020 0.033 271.8 2021 0.019 197.0 2022 0.042 148.4 2023 0.072 137.3 2024 0.101 132.6 2025 0.127 130.0 2026 0.150 128.3 2027 0.168 126.9 2028 0.180 125.8 2029 0.187 124.8 2030 0.189 123.8		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
00174+0853	A 1803	AB	1998	51	300	0.1	8.38	7.78	F7V	NOD	001724.50+085234.8
00174+0853	A 1803	AB	2008	52	307	0.2	8.38	7.78	F7V	NOD	001724.50+085234.8

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