Megrez information

Megrez
	; Location of Megrez (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Ursa Major
Right ascension	12h 15m 25.56063s
Declination	+57° 01′ 57.4156″
Apparent magnitude (V)	+3.312
Characteristics
Spectral type	A3 V
U−B color index	+0.067
B−V color index	+0.075
Astrometry
Radial velocity (Rv)	-20.2 km/s
Proper motion (μ)	RA: +104.11 mas/yr ; Dec.: 7.30 mas/yr
Parallax (π)	40.51 ± 0.15 mas
Distance	80.5 ± 0.3 ly ; (24.69 ± 0.09 pc)
Absolute magnitude (MV)	+1.39
Details
Mass	1.63 M☉
Radius	1.4 R☉
Luminosity	14 L☉
Surface gravity (log g)	4.49 cgs
Temperature	9,480±570 K
Rotational velocity (v sin i)	233 km/s
Age	0.3 Gyr
Other designations
	Megrez, δ Ursae Majoris, δ UMa, Delta UMa, 69 Ursae Majoris, BD+57 1363, CCDM J12155+5702A, FK5 456, GC 16736, HD 106591, HIP 59774, HR 4660, IDS 12105+5735 A, PPM 33469, SAO 28315, WDS J12154+5702A.
Database references
SIMBAD	data

Megrez /ˈmiːɡrɛz/, also called Delta Ursae Majoris (δ Ursae Majoris, abbreviated Delta UMa, δ UMa),^[11]^[12] is a star in the northern constellation of Ursa Major. With an apparent magnitude of +3.3,^[2] it is the dimmest of the seven stars in the Big Dipper asterism. Parallax measurements yield a distance estimate of 80.5 light-years (24.7 parsecs) from the Sun.^[1]

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^ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
^ "IAU Catalog of Star Names". Retrieved 28 July 2016.

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[Kunitzsch-11] Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.

[IAU-CSN-12] "IAU Catalog of Star Names". Retrieved 28 July 2016.

Observation data Epoch J2000 Equinox J2000
Location of Megrez (circled)
Constellation	Ursa Major
Right ascension	12^h 15^m 25.56063^s^[1]
Declination	+57° 01′ 57.4156″^[1]
Apparent magnitude (V)	+3.312^[2]
Characteristics
Spectral type	A3 V^[3]
U−B color index	+0.067^[2]
B−V color index	+0.075^[2]
Astrometry

Radial velocity (R_v)	-20.2^[4] km/s
Proper motion (μ)	RA: +104.11^[1] mas/yr Dec.: 7.30^[1] mas/yr
Parallax (π)	40.51 ± 0.15 mas^[1]
Distance	80.5 ± 0.3 ly (24.69 ± 0.09 pc)
Absolute magnitude (M_V)	+1.39^[5]

Details

Mass	1.63^[6] `M`_☉
Radius	1.4^[7] `R`_☉
Luminosity	14^[7] `L`_☉
Surface gravity (log g)	4.49^[7] cgs
Temperature	9,480±570^[7] K
Rotational velocity (v sin i)	233^[8] km/s
Age	0.3^[9] Gyr

Other designations
Megrez, δ Ursae Majoris, δ UMa, Delta UMa, 69 Ursae Majoris, BD+57 1363, CCDM J12155+5702A, FK5 456, GC 16736, HD 106591, HIP 59774, HR 4660, IDS 12105+5735 A, PPM 33469, SAO 28315, WDS J12154+5702A.^[10]
Database references
SIMBAD	data

Megrez information

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