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07187-2457
HJ 3948 AB
Tau CMa

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Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

07187-2457 HJ 3948 AB (Tau CMa)

07^h 18^m 42.49^s -24° 57' 15.8" P.A. 90.00 sep 8.3 mag 4.42,10.20 Sp O9II dist. 917.43 pc (2992.66 l.y.)

Coord 2000	07187-2457		Discov num	HJ 3948		Comp	AB		Coord arcsec 2000	07 18 42.49 -24 57 15.8
Date first	1835		Date last	2015		Obs	14
Pa first	86		Pa last	90.2		P.A. Now (θ)	90.2°
Sep first	8.0		Sep last	8.314		Sep. Now (ρ)	8.314"
Mag pri	4.42		Mag sec	10.20		delta mag (ΔM)	5.78		Spectral class	O9II (blue)
Pri motion ra	-002		Sec motion ra
Pri motion dec	-001		Sec motion dec
Notes	N (See Notes)

Nature of this double is uncertain.

07187-2457 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		173446	07 18 42 -24 57 16	FIN 313 Aa,Ab	2018	48	131	0.1	4.89	5.33	0.44
Show	Tau CMa	173446	07 18 42 -24 57 16	HJ 3948 AB	2015	14	90	8.3	4.42	10.20	5.78		<===
Show		173446	07 18 42 -24 57 16	HJ 3948 AC	2002	9	87	14.2	4.42	11.20	6.78
Show		173446	07 18 42 -24 57 16	HJ 3948 AD	2020	13	78	83.5	4.42	8.22	3.80
Show		173446	07 18 42 -24 57 16	TOK 42 AE	2018	12	87	0.9	5.33	9.70	4.37

Sextuple system
5 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Name	Tau CMa		Var name	NSV3528 CMa		Constellation	Canis Major		SAO	173446
HIP	35415		Tycho2	6541-04204-1		Gaia DR2	5616537013676667392		HD	57061
HR	2782		GC	9736		ADS	5977		CD	CD-24 5176
CP	CP-24 2216		Bayer	Tau Canis Majoris		Bayer name	Tau CMa		Flamsteed	30 Canis Majoris
Flamsteed name	30 CMa		Distance	917.43		Distance ly	2992.66		Bayer greek	τ CMa