R Ursae Minoris

R Ursae Minoris
	; A visual band light curve for R Ursae Minoris, plotted from AAVSO data
Observation data; Epoch J2000 Equinox J2000
Constellation	Ursa Minor
Right ascension	16h 29m 57.8923s
Declination	+72° 16′ 49.166″
Apparent magnitude (V)	8.5-11.5
Characteristics
Spectral type	M7IIIe
Variable type	semiregular variable
Astrometry
Proper motion (μ)	RA: 11.973±0.085 mas/yr ; Dec.: 13.976±0.092 mas/yr
Parallax (π)	2.6648 ± 0.0629 mas
Distance	1,220 ± 30 ly ; (375 ± 9 pc)
Absolute magnitude (MV)	+2.461 (var)
Details
Mass	1.71 M☉
Radius	686 R☉
Surface gravity (log g)	−0.46 cgs
Temperature	2,875 K
Metallicity [Fe/H]	+0.07 dex
Other designations
	R UMi, BD+72°732a, HD 149683, HIP 80802
Database references
SIMBAD	data

R Ursae Minoris is a star in the constellation Ursa Minor. A red giant of spectral type M7IIIe, it is a semiregular variable ranging from magnitude 8.5 to 11.5 over a period of 325 days.^[3]

In 1881, Edward Charles Pickering announced that the star, at that time unnamed, is a variable star.^[8] It was listed with its variable star designation, R Ursae Minoris, in Annie Jump Cannon's 1907 work Second Catalog of Variable Stars.^[9]

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^ ^a ^b ^c ^d ^e Cite error: The named reference edr3 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Watson, Christopher (4 January 2010). "RR Ursae Minoris". AAVSO Website. American Association of Variable Star Observers. Retrieved 10 March 2015.
^ Cite error: The named reference gontcharov2011 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference starhorse2 was invoked but never defined (see the help page).
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^ Cite error: The named reference Pickering1881 was invoked but never defined (see the help page).
^ Cite error: The named reference Cannon1907 was invoked but never defined (see the help page).

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

[edr3-2] Cite error: The named reference edr3 was invoked but never defined (see the help page).

[AAVSOr-3] Watson, Christopher (4 January 2010). "RR Ursae Minoris". AAVSO Website. American Association of Variable Star Observers. Retrieved 10 March 2015.

[gontcharov2011-4] Cite error: The named reference gontcharov2011 was invoked but never defined (see the help page).

[starhorse2-5] Cite error: The named reference starhorse2 was invoked but never defined (see the help page).

[kervella2022-6] Cite error: The named reference kervella2022 was invoked but never defined (see the help page).

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

[Pickering1881-8] Cite error: The named reference Pickering1881 was invoked but never defined (see the help page).

[Cannon1907-9] Cite error: The named reference Cannon1907 was invoked but never defined (see the help page).

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Observation data Epoch J2000 Equinox J2000
A visual band light curve for R Ursae Minoris, plotted from AAVSO data^[1]
Constellation	Ursa Minor
Right ascension	16^h 29^m 57.8923^s^[2]
Declination	+72° 16′ 49.166″^[2]
Apparent magnitude (V)	8.5-11.5^[3]
Characteristics
Spectral type	M7IIIe^[3]
Variable type	semiregular variable^[3]
Astrometry

Proper motion (μ)	RA: 11.973±0.085^[2] mas/yr Dec.: 13.976±0.092^[2] mas/yr
Parallax (π)	2.6648 ± 0.0629 mas^[2]
Distance	1,220 ± 30 ly (375 ± 9 pc)
Absolute magnitude (M_V)	+2.461^[4] (var)

Details

Mass	1.71^[5] `M`_☉
Radius	686^[6] `R`_☉
Surface gravity (log g)	−0.46^[5] cgs
Temperature	2,875^[5] K
Metallicity [Fe/H]	+0.07^[5] dex

Other designations
R UMi, BD+72°732a, HD 149683, HIP 80802^[7]
Database references
SIMBAD	data

R Ursae Minoris

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