19525+0100 EVS 2 AB (Eta Aql)

Coord 2000	19525+0100		Discov num	EVS   2		Comp	AB		Coord arcsec 2000	19 52 28.36 +01 00 20.4
Date first	2011		Date last	2012		Obs	2
Pa first	96		Pa last	92.8		P.A. Now (θ)	92.8°
Sep first	0.7		Sep last	0.655		Sep. Now (ρ)	0.655"
Mag pri	3.80		Mag sec	10.00		delta mag (ΔM)	6.2		Spectral class	F6Iab+F3V (yellow-white/yellow-white)
Pri motion ra	+009		Sec motion ra
Pri motion dec	-008		Sec motion dec
Notes	N (See Notes)

Nature of this double is uncertain.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	Eta Aql	125159	19 52 28 +01 00 20	EVS 2 AB	2012	2	93	0.7	3.80	10.00	6.20		<===
Show		125159	19 52 28 +01 00 20	KRV 27 AC	2015	2	92	135.8	3.80	20.50	16.70

Triple system
3 estimated visually detectable stars in this system

Name	Eta Aql		Constellation	Aquila		SAO	125159		HIP	97804
Tycho2	0480-03027-1		HD	187929		HR	7570		GC	27517
BD	BD+00 4337		Bayer	Eta Aquilae		Bayer name	Eta Aql		Flamsteed	55 Aquilae
Flamsteed name	55 Aql		FK5	746		Distance	423.73		Distance ly	1382.21
Bayer greek	η Aql

discov_num	notes	refcode
EVS 2	1975.402: oblate correlation peak	Bla1977a
	Primary is Cepheid eta Aql.
	Masses are 5.7 and 2.3 Msun. Estimated period = 866y,
	a = 200au = 0.73".	Evs2013
	NPOI Limb-darkened diameter 1.73 +/- 0.05 mas,	NOI1999
	R = 66. +/- 22. \rsun.
	NPOI Limb-darkened diameter 1.69 +/- 0.04 mas.	NOI2001a
	NPOI Limb-darkened diameter 1.804 +/- 0.007 mas, Sp = G0III,	NOI2018
	Teff = 6329 +/-126 K, M = 4.24 +/- 0.58 \msun, Age = 0.15 +/- 0.05 Gyr.

refcode	metd	author	reference
Bla1977a	S j	Blazit, A., Bonneau, D., Koechlin, L. & Labeyrie, A.	1977ApJ...214L..79B
Bla1977a		ApJ 214, L79, 1977
Evs2013	Hp j	Evans, N.R., Bond, H.E., Schaefer, G.H., Mason, B.D., Karovska, M., & Tingle, E.	2013AJ....146...93E
Evs2013	+X	AJ 146, 93, 2013
NOI1999	not j	Nordgren, T.E., Germain, M.E., Benson, J.A., Mozurkewich, D., Sudol, J.J., Elias,	1999AJ....118.3032N
NOI1999		II, N.M., Hajian, A.R., White, N.M., Hutter, D.J., Johnston, K.J., Gauss, F.S.,	.
NOI1999		Armstrong, J.T., Pauls, T.A. & Rickard, L.J.	.
NOI1999		AJ 118, 3032, 1999	.
NOI2001a	not j	Armstrong, J.T., Nordgren, T.E., Germain, M.E., Hajian, A.R., Hindsley, R.B.,	2001AJ....121..476A
NOI2001a		Hummel, C.A., Mozurkewich, D. & Thessin, R.N.	.
NOI2001a		AJ 121, 476, 2001	.
NOI2018	not j	Baines, E.K., Armstrong, J.T., Schmitt, H.R., Zavala, R.T., Benson, J.A., Hutter,	2018AJ....155...30B
NOI2018		D.J., Tycner, C. & van Belle, G.T.
NOI2018		AJ 155, 30, 2018

idgroup	discov	author
1	KRV	Kervella, P., Thevenin, F., & Petr-Gotzens, M.G.
10	KRV	Kervella, P., Gallenne, A., Evans, N.R., Szabados, L., Arenouu, F., Merand, A.,
10	KRV	Proto, Y., Karczmarek, P., Nardetto, N., Gieren, W. & Pietrzynski, G.
11	KRV	Kervella, P., Gallenne, A., Evans, N.R., Szabados, L., Arenouu, F., Merand, A.,
11	KRV	Nardetto, N., Gieren, W. & Pietrzynski, G.
13	KRV	Kervella, P., Borgniet, S., de Souza, A.D., Merand, A., Gallenne, A., Rivinius, T.,
13	KRV	Lacour, S., Carciofi, A., Faes, D.M., Le Bouquin, J.-B., Taormina, M., Pilecki, B.,
13	KRV	Berger, J.-P., Bendjoya, P., Klement, R., Millour, F., Janot-Pacheco, E., Spang, A.

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
19525+0100	EVS 2	AB	2012	1	93	0.7	1.79	9.18	F6Iab+B9V	N K	195228.36+010020.4

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Radius: auto 0.5" 0.8" 1" 2" 3" 5" 10" 15" 20" 25" 30" 35" 40" 45" 50" 55" 1' 2' 3' 4' 5' 6' 7' 8' 9' 10' 15' 20' 30' 40' 50' 1° 2° 4° 5° 8° Components only

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