Lambda Ursae Minoris information

λ Ursae Minoris
	; A light curve for Lambda Ursae Minoris, plotted from Hipparcos data
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Ursa Minor
Right ascension	17h 16m 56.4107s
Declination	+89° 02′ 15.734″
Apparent magnitude (V)	+6.38
Characteristics
Spectral type	M3+ IIIa
U−B color index	+1.79
B−V color index	+1.57
Variable type	SRb
Astrometry
Radial velocity (Rv)	+0.19 km/s
Proper motion (μ)	RA: −23.989 mas/yr ; Dec.: 3.463 mas/yr
Parallax (π)	3.7084 ± 0.1329 mas
Distance	880 ± 30 ly ; (270 ± 10 pc)
Absolute magnitude (MV)	−0.85
Details
Radius	64 R☉
Luminosity	741 L☉
Temperature	3,772 K
Other designations
	HR 7394, HD 183030, BD+88°112, FK5 914, HIP 84535, SAO 3020
Database references
SIMBAD	data

Lambda Ursae Minoris (λ UMi, λ Ursae Minoris) is a star in the constellation Ursa Minor. It is an M-type red giant with an apparent magnitude of +6.38 and is approximately 880 light years from Earth.

Lambda Ursae Minoris is an asymptotic giant branch (AGB) star, a star that has exhausted its core hydrogen and helium and is now fusing material in shells outside its core.^[8] AGB stars are often unstable and tend to pulsate, and Lambda Ursae Minoris is classified as a semiregular variable star and its brightness varies by about 0.1 magnitudes.^[6] Its variability was discovered from Hipparcos astrometry and it was entered into the General Catalogue of Variable Stars in 1999.^[9]

This star was used from 1882 as a reference to measure the magnitudes of stars in the northern hemisphere for the 1908 Revised Harvard Photometry catalogue. Sigma Octantis was used for the southern hemisphere. It was then noted that "Neither of these stars appears to vary perceptibly" but that, due to the procedures used "if they did, the variation would have no effect on the final measures."^[10]

^ Cite error: The named reference CDS was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Cite error: The named reference dr2 was invoked but never defined (see the help page).
^ Cite error: The named reference ducati was invoked but never defined (see the help page).
^ Cite error: The named reference yamashita was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference hr was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference gcvs was invoked but never defined (see the help page).
^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
^ Cite error: The named reference eggen was invoked but never defined (see the help page).
^ Cite error: The named reference ibvs was invoked but never defined (see the help page).
^ Cite error: The named reference rhpc was invoked but never defined (see the help page).

[CDS-1] Cite error: The named reference CDS was invoked but never defined (see the help page).

[dr2-2] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Cite error: The named reference dr2 was invoked but never defined (see the help page).

[ducati-3] Cite error: The named reference ducati was invoked but never defined (see the help page).

[yamashita-4] Cite error: The named reference yamashita was invoked but never defined (see the help page).

[hr-5] Cite error: The named reference hr was invoked but never defined (see the help page).

[gcvs-6] Cite error: The named reference gcvs was invoked but never defined (see the help page).

[Anderson2012-7] Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).

[eggen-8] Cite error: The named reference eggen was invoked but never defined (see the help page).

[ibvs-9] Cite error: The named reference ibvs was invoked but never defined (see the help page).

[rhpc-10] Cite error: The named reference rhpc was invoked but never defined (see the help page).

Observation data Epoch J2000.0 Equinox J2000.0
A light curve for Lambda Ursae Minoris, plotted from Hipparcos data^[1]
Constellation	Ursa Minor
Right ascension	17^h 16^m 56.4107^s^[2]
Declination	+89° 02′ 15.734″^[2]
Apparent magnitude (V)	+6.38^[3]
Characteristics
Spectral type	M3+ IIIa^[4]
U−B color index	+1.79^[5]
B−V color index	+1.57^[5]
Variable type	SRb^[6]
Astrometry

Radial velocity (R_v)	+0.19^[2] km/s
Proper motion (μ)	RA: −23.989^[2] mas/yr Dec.: 3.463^[2] mas/yr
Parallax (π)	3.7084 ± 0.1329 mas^[2]
Distance	880 ± 30 ly (270 ± 10 pc)
Absolute magnitude (M_V)	−0.85^[7]

Details

Radius	64^[2] `R`_☉
Luminosity	741^[2] `L`_☉
Temperature	3,772^[2] K

Other designations
HR 7394, HD 183030, BD+88°112, FK5 914, HIP 84535, SAO 3020
Database references
SIMBAD	data

Lambda Ursae Minoris information

and 14 Related for: Lambda Ursae Minoris information

Lambda Ursae Minoris

Ursa Minor

Sigma Octantis

Pole star

Thuban

List of brightest natural objects in the sky

List of Arabic star names

List of proper names of stars

Star system

List of nearest stars

List of largest stars

List of nearest bright stars

List of the most distant astronomical objects

List of smallest known stars