16406+0413 STFA 31 AB (37 Her)

Coord 2000	16406+0413		Discov num	STFA 31		Comp	AB		Coord arcsec 2000	16 40 38.69 +04 13 11.3
Date first	1777		Date last	2017		Obs	87
Pa first	228		Pa last	229		P.A. Now (θ)	229°
Sep first	69.0		Sep last	69.3		Sep. Now (ρ)	69.3"
Mag pri	5.76		Mag sec	6.92		delta mag (ΔM)	1.16		Spectral class	A1V+A3IV (white/white)
Pri motion ra	+002		Sec motion ra	+001
Pri motion dec	-012		Sec motion dec	-010
Notes	N Z V (See Notes, Parallax indicates components are physical, Proper motion indicates physical)

rPM=0.184 (< 0.3, Physical double) This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		121776	16 40 39 +04 13 11	CHR 56 Aa,Ab	2009	3	280	0.0	5.90	7.80	1.90
Show	37 Her	121776	16 40 39 +04 13 11	STFA 31 AB	2017	87	229	69.3	5.76	6.92	1.16		<===
Show		121774	16 40 35 +04 12 26	STF 2074 BC	2020	16	316	25.7	6.92	11.40	4.48

Quadruple system
3 estimated visually detectable stars in this system

Name	37 Her		Constellation	Hercules		SAO	121776		HIP	81641
Tycho2	0391-02824-1		Gaia DR2	4434301983614947072		HD	150378		HR	6195
GC	22430		ADS	10149		DM	BD+04 3234		BD	BD+04 3235
Flamsteed	37 Herculis		Flamsteed name	37 Her		Distance	90.01		Distance ly	293.61

discov_num	notes	refcode
CHR 56	Aa,Ab: 37 Her. B is 36 Her, BD+04@3234.
	This system, first announced by McAlister and recalled in a later	McA1984b
	McAlister paper after repeated attempts at confirmation, has been	McA1993
	restored. While perhaps still spurious, the subsequent confirmation or
	suspected duplicity (by another technique) makes the discovery
	measurement somewhat more probable.
STFA 31	STTA148.
	AB: SHY 707. Bayesian analysis by Shaya & Olling (2011) indicates very	Shy2011
	high (near 100%) probability pair is physical.
	AB: H 5 72.	MEv2010

refcode	metd	author	reference
McA1984b	Sc j	McAlister, H.A. & Hartkopf, W.I.	...................
McA1984b		Catalog of Interferometric Measurements of Binary Stars, CHARA Contrib. #1, 1984
McA1984b		(previously unpublished KPNO 2.1m and 3.8m data)
McA1993	Sc j	McAlister, H.A., Mason, B.D., Hartkopf, W.I., & Shara, M.M.	1993AJ....106.1639M
McA1993	+orb	AJ 106, 1639, 1993
MEv2010	-	MacEvoy, B.	...................
MEv2010		private communication, 2010 (see http://www.handprint.com/ASTRO/index.html)
Shy2011	-	Shaya, E.J. & Olling, R.	2011ApJS..192....2S
Shy2011		ApJS 192, 2, 2011
Shy2011		(Statistical analysis of probability that wide Hipparcos pairs are physical. Pairs
Shy2011		added to WDS only if probability 90% or greater.)

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
16406+0413	STFA 31	AB	2006	72	229	69.0	5.76	6.92		ZD	164038.69+041311.3
16406+0413	STFA 31	AB	2008	73	230	69.3	5.76	6.92		ZD	164038.69+041311.3
16406+0413	STFA 31	AB	2009	74	230	69.3	5.76	6.92		NZD	164038.69+041311.3
16406+0413	STFA 31	AB	2012	79	230	69.5	5.76	6.92	A1V+A3IV	NZDV	164038.69+041311.3
16406+0413	STFA 31	AB	2013	80	229	69.5	5.76	6.92	A1V+A3IV	NZDV	164038.69+041311.3
16406+0413	STFA 31	AB	2015	83	229	69.6	5.76	6.92	A1V+A3IV	NZ V	164038.69+041311.3
16406+0413	STFA 31	AB	2017	85	229	69.3	5.76	6.92	A1V+A3IV	NZ V	164038.69+041311.3

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	22/06/29	daedalus1	mean difficulty	separated	230		Seeing Pickering 5, poor. Measures: theta 230, rho 69.6 +/- 0.516. Bright, wide pair. Companion easily recognized. C component very faint, identified with averted vision.

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