τ-CMa (Star)

R/B-band color composite image from the Second Digitized Sky Survey (DSS2), measuring 30 arcminutes across.

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From South El Monte , τ-CMa will become visible at around 20:13 (PDT), 29° above your southern horizon, as dusk fades to darkness. It will then sink towards the horizon, setting at 00:15.

Begin typing the name of a town near to you, and then select the town from the list of options which appear below.

Name τ-CMa

Object type Star

Other names

τ-CMa
Tau Canis Majoris
30-CMa
30 Canis Majoris
HR 2782^[1]
HD 57061
NSV 3528
HIP 35415^[5]
TYC 6541-4204-1^[4]
Gaia EDR3- 5616537017987940736^[6]

Position

Right ascension:	07^h18^m42^s ^[6]
Declination:	−24°57'15" ^[6]
Constellation:	Canis Major
Magnitude: Variable	4.40 (V) ^[3] 4.18 (BT) ^[2] 4.37 (VT) ^[2] 4.28 (G) ^[6] 4.26 (BP) ^[6] 4.46 (RP) ^[6]
B-V Color (mag):	-0.17
Proper motion (speed):	1.9 mas/yr^[1]
Proper motion (pos ang):	254.7°

Sources

^[1]	Bright Star Catalogue, 5th Revised Ed. (Hoffleit et al. 1991)

^[2]	The Hipparcos Catalogue (ESA 1997)

^[3]	The Tycho Catalogue (ESA 1997)

^[4]	The Tycho-2 Catalogue (Hog et al. 2000)

^[5]	Hipparcos, the new reduction of the raw data (van Leeuwen 2007)

^[6]	Gaia EDR3 (Gaia Collaboration 2020)

Visibility from South El Monte

All times shown in South El Monte local time.

South El Monte

Latitude:
Longitude:
Timezone:

34.05°N
118.05°W
PDT

Color scheme

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Last updated: 01 Apr 2026, 18:14 UTC
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