20181+1555 J   553

Coord 2000	20181+1555		Discov num	J   553		Comp			Coord arcsec 2000	20 18 06.69 +15 54 09.5
Date first	1910		Date last	2016		Obs	16
Pa first	20		Pa last	20		P.A. Now (θ)	20°
Sep first	4.2		Sep last	3.7		Sep. Now (ρ)	3.7"
Mag pri	10.70		Mag sec	11.90		delta mag (ΔM)	1.2		Spectral class	B2+A2 (blue-white/white)
Pri motion ra	+005		Sec motion ra
Pri motion dec	-003		Sec motion dec
Notes	N (See Notes)

Visually invisible, K-band or other infrared star Nature of this double is uncertain.

Precise pa	19.6		Precise sep	3.695		Constellation	Delphinus		Tycho2	1631-00441-1
Gaia DR2	98527206656		HD	355372

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20181+1555	J 553		2001	11	21	3.6	9.40	10.50		N D	201806.69+155409.5
20181+1555	J 553		2008	12	21	3.6	9.40	10.50		N D	201806.69+155409.5
20181+1555	J 553		2016	16	20	3.7	10.60	11.90	B2+A2	N	201806.69+155409.5

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