16133+1332 STF 2021 AB (49 Ser)

Coord 2000	16133+1332		Discov num	STF2021		Comp	AB		Coord arcsec 2000	16 13 18.45 +13 31 37.2
Date first	1825		Date last	2021		Obs	430
Pa first	318		Pa last	0.4		P.A. Now (θ)	0.4°
Sep first	3.5		Sep last	4.04		Sep. Now (ρ)	4.04"
Mag pri	7.43		Mag sec	7.48		delta mag (ΔM)	0.05		Spectral class	G9V (yellow)
Pri motion ra	+183		Sec motion ra	+183
Pri motion dec	-419		Sec motion dec	-419
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		102018	16 13 18 +13 31 37	CHR 52 Aa,Ab	1983	1	125	0.2	7.53
Show	49 Ser		16 13 18 +13 31 37	STF 2021 AB	2021	430	0	4.0	7.43	7.48	0.05	Y	<===
Show			16 13 18 +13 31 37	STF 2021 AC	2001	13	118	206.2	7.43	11.28	3.85

Quadruple system
3 estimated visually detectable stars in this system

Name	49 Ser		Constellation	Hercules		HIP	79492		Tycho2	0958-01468-1
Gaia DR2	4464207428577214464		HD	145958		GC	21821		ADS	9969
GL	Gl 615.1A		BD	BD+13 3091		Flamsteed	49 Serpentis		Flamsteed name	49 Ser
Distance	23.58		Distance ly	76.92

Bayer or Flamsteed indentifiers not always match the correct constellation because of procession and proper motion of the star. (Ser vs Her)

Period (P)	949.6773y	± 430.3609	Periastron (T)	1713.7408y	± 68.8958	Semi-major axis (a)	3.97885a	± 1.05309
Eccentricity (e)	0.29964	± 0.29398	Inclination (i)	52.38°	± 10.38	Longitude of periastron (ω)	79.167°	± 47.111
Node (Ω)	150.395°	± 27.753	Notes	n		Reference	Izm2019
Equinox			Last observation	2015		Grade	4	(1=Definitive, 9=Indet.)

label theta rho 2000 354.0 4.105 2001 354.2 4.102 2002 354.4 4.100 2003 354.7 4.098 2004 354.9 4.095 2005 355.1 4.093 2006 355.3 4.090 2007 355.5 4.088 2008 355.7 4.085 2009 355.9 4.082 2010 356.1 4.080 2011 356.3 4.077 2012 356.5 4.074 2013 356.8 4.071 2014 357.0 4.068 2015 357.2 4.065 2016 357.4 4.062 2017 357.6 4.059 2018 357.8 4.056 2019 358.0 4.053 2020 358.2 4.050 2021 358.4 4.046 2022 358.7 4.043 2023 358.9 4.039 2024 359.1 4.036 2025 359.3 4.033 2026 359.5 4.029 2027 359.7 4.025 2028 360.0 4.022 2029 0.2 4.018 2030 0.4 4.014		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

discov_num	notes	refcode
STF2021	49 Ser
	See Baize & Petit (1989) catalog of doubles with variable component.	Baz1989d
	Hopmann (1964) orbit rejected from Fourth Orbit Catalog	Hop1964b
	("period over 4000 years")	Wor1983
	AB: NLTT 42273/42272	Chm2004
	AC: Optical pair, based on study of relative motion of the
	components using the method of apparent motion parameters.	Kiy2008
	AB: H 1 82.	MEv2010

refcode	metd	author	reference
Baz1989d	-	Baize, P. & Petit, M.	1989A&AS...77..497B
Baz1989d		A&AS 77, 497, 1989
Chm2004	E -	Chaname, J. & Gould, A.	2004ApJ...601..289C
Chm2004		ApJ 601, 289, 2004
Chm2004		(Photometry, coordinates, and astrometry from rNLTT. Astrometry from early
Chm2004		versions of 2MASS and UCAC, with date given only as "circa 2000". Measures
Chm2004		identical to discovery observations - predominantly close pairs - were assumed
Chm2004		not new observations, so not included in WDS. Similar concerns when primary and
Chm2004		secondary magnitudes or proper motions were the same.)
Hop1964b	orb -	Hopmann, J.	1964AnWie..26....1H
Hop1964b		Ann. Sternw. Wien 26, #1, 1964
Izm2019	orb u	Izmailov, I.S.	2019AstL...45...30I
Izm2019		Ast. Lett. 45, 30, 2019
Izm2019		(Orbital elements from weighted solutions used when available (Table 2),
Izm2019		unweighted elements (Table 1) used for remaining 29 systems.)
Kiy2008	-	Kiyaeva, O.V., Kiselev, A.A. & Izmailov, I.S.	2008SvAL...32..405K
Kiy2008		SvAL 34, 405, 2008
MEv2010	-	MacEvoy, B.	...................
MEv2010		private communication, 2010 (see http://www.handprint.com/ASTRO/index.html)
Wor1983	-	Worley, C.E. & Heintz, W.D.	1983PUSNO..24g...1W
Wor1983		Pub. USNO 24, Pt. 7, 1983 (Fourth Orbit Catalog)

idgroup	discov	author
1	CHR	Center for High Ang. Res. Astronomy (speckle interferometry systems)
3	STF	Struve, F.G.W.

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
16133+1332	STF2021	AB	2007	397	358	4.1	7.43	7.48		ODV	161318.45+133137.2
16133+1332	STF2021	AB	2008	401	357	4.0	7.43	7.48		ODV	161318.45+133137.2
16133+1332	STF2021	AB	2009	402	356	4.1	7.43	7.48		ODV	161318.45+133137.2
16133+1332	STF2021	AB	2010	404	356	4.0	7.43	7.48		NOD	161318.45+133137.2
16133+1332	STF2021	AB	2012	407	357	4.1	7.43	7.48	G9V	NOD	161318.45+133137.2
16133+1332	STF2021	AB	2014	409	358	4.0	7.43	7.48	G9V	NOD	161318.45+133137.2
16133+1332	STF2021	AB	2015	415	358	4.1	7.43	7.48	G9V	NO	161318.45+133137.2
16133+1332	STF2021	AB	2017	421	358	4.0	7.43	7.48	G9V	NO	161318.45+133137.2
16133+1332	STF2021	AB	2018	423	358	4.1	7.43	7.48	G9V	NO	161318.45+133137.2
16133+1332	STF2021	AB	2019	426	358	4.0	7.43	7.48	G9V	NO	161318.45+133137.2
16133+1332	STF2021	AB	2021	429	0	4.0	7.43	7.48	G9V	NO	161318.45+133137.2

If you need more information about this double, apply for a data request form to the WDS.

Show	date	username	difficulty	separation	pa_estim	interest	notes
Show	22/06/10	daedalus1	mean difficulty	separated	358		Seeing: Pickering 6, good. Measures: theta 358, rho 4.0 +/- 0.25. Beautiful, bright pair. C component easily recognized.

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