Kruger 60 information

Krüger 60 A/B
	; A blue band light curve for a flare on DO Cephei, adapted from Dal (2020)
Observation data; Epoch J2000 Equinox
Constellation	Cepheus
	Krüger 60 A
Right ascension	22h 27m 59.55755s
Declination	+57° 41′ 42.0806″
Apparent magnitude (V)	9.59[citation needed]
	Krüger 60 B
Right ascension	22h 27m 59.79560s
Declination	+57° 41′ 49.7468″
Apparent magnitude (V)	11.40[citation needed]
Characteristics
Spectral type	M3V/M4V
U−B color index	1.27/1.3[citation needed]
B−V color index	1.65/1.8[citation needed]
Variable type	None/Flare star
Astrometry
Krüger 60 A
Radial velocity (Rv)	–33.1[citation needed] km/s
Proper motion (μ)	RA: −725.227±0.537 mas/yr ; Dec.: −223.461±0.348 mas/yr
Parallax (π)	249.3926 ± 0.1653 mas
Distance	13.078 ± 0.009 ly ; (4.010 ± 0.003 pc)
Absolute magnitude (MV)	11.76
Krüger 60 B
Radial velocity (Rv)	–31.9[citation needed] km/s
Proper motion (μ)	RA: −934.098±1.319 mas/yr ; Dec.: −686.244±1.410 mas/yr
Parallax (π)	249.9668 ± 0.7414 mas
Distance	13.05 ± 0.04 ly ; (4.00 ± 0.01 pc)
Absolute magnitude (MV)	13.46
Details
Krüger 60 A
Mass	0.271 M☉
Radius	0.35 R☉
Luminosity	0.010[citation needed] L☉
Temperature	3,180[citation needed] K
Metallicity	–0.04
Krüger 60 B
Mass	0.176 M☉
Radius	0.24 R☉
Luminosity	0.0034[citation needed] L☉
Temperature	2,890[citation needed] K
Orbit
Primary	Krüger 60 A
Companion	Krüger 60 B
Period (P)	44.67 yr
Semi-major axis (a)	2.383″
Eccentricity (e)	0.410
Inclination (i)	167.2°
Longitude of the node (Ω)	154.5°
Periastron epoch (T)	1970.22
Argument of periastron (ω); (primary)	211.0°
Other designations
	BD+56° 2783, GJ 860 A/B, HD 239960, HIP 110893, ADS 15972, G 232-075, LHS 3814/3815
Database references
SIMBAD	The system
	A
	B
	Krüger 60 Location of Krüger 60 in the constellation Cepheus;

Krüger 60 (DO Cephei) is a binary star system located 13.1 light-years (4.0 parsecs) from the Sun. These red dwarf stars orbit each other every 44.6 years.

^ Cite error: The named reference Dal was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e Cite error: The named reference GaiaDR2a was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e Cite error: The named reference GaiaDR2b was invoked but never defined (see the help page).
^ Cite error: The named reference apj108 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference aaa364 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference aaa367 was invoked but never defined (see the help page).
^ Bonfils, Xavier; Delfosse, Xavier; Udry, Stéphane; Santos, Nuno C.; Forveille, Thierry; Ségransan, Damien (2005). "Metallicity of M dwarfs. I. A photometric calibration and the impact on the mass-luminosity relation at the bottom of the main sequence". Astronomy and Astrophysics. 442 (2): 635–642. arXiv:astro-ph/0503260. Bibcode:2005A&A...442..635B. doi:10.1051/0004-6361:20053046. S2CID 13900901. Only listed for component A.
^ Cite error: The named reference aas65 was invoked but never defined (see the help page).
^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

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

[GaiaDR2a-2] Cite error: The named reference GaiaDR2a was invoked but never defined (see the help page).

[GaiaDR2b-3] Cite error: The named reference GaiaDR2b was invoked but never defined (see the help page).

[apj108-4] Cite error: The named reference apj108 was invoked but never defined (see the help page).

[aaa364-5] Cite error: The named reference aaa364 was invoked but never defined (see the help page).

[aaa367-6] Cite error: The named reference aaa367 was invoked but never defined (see the help page).

[7] Bonfils, Xavier; Delfosse, Xavier; Udry, Stéphane; Santos, Nuno C.; Forveille, Thierry; Ségransan, Damien (2005). "Metallicity of M dwarfs. I. A photometric calibration and the impact on the mass-luminosity relation at the bottom of the main sequence". Astronomy and Astrophysics. 442 (2): 635–642. arXiv:astro-ph/0503260. Bibcode:2005A&A...442..635B. doi:10.1051/0004-6361:20053046. S2CID 13900901. Only listed for component A.

[aas65-8] Cite error: The named reference aas65 was invoked but never defined (see the help page).

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

Observation data Epoch J2000 Equinox
A blue band light curve for a flare on DO Cephei, adapted from Dal (2020)^[1]
Constellation	Cepheus
Krüger 60 A
Right ascension	22^h 27^m 59.55755^s^[2]
Declination	+57° 41′ 42.0806″^[2]
Apparent magnitude (V)	9.59^{[citation needed]}
Krüger 60 B
Right ascension	22^h 27^m 59.79560^s^[3]
Declination	+57° 41′ 49.7468″^[3]
Apparent magnitude (V)	11.40^{[citation needed]}
Characteristics
Spectral type	M3V/M4V^[4]
U−B color index	1.27/1.3^{[citation needed]}
B−V color index	1.65/1.8^{[citation needed]}
Variable type	None/Flare star
Astrometry
Krüger 60 A
Radial velocity (R_v)	–33.1^{[citation needed]} km/s
Proper motion (μ)	RA: −725.227±0.537^[2] mas/yr Dec.: −223.461±0.348^[2] mas/yr
Parallax (π)	249.3926 ± 0.1653 mas^[2]
Distance	13.078 ± 0.009 ly (4.010 ± 0.003 pc)
Absolute magnitude (M_V)	11.76
Krüger 60 B
Radial velocity (R_v)	–31.9^{[citation needed]} km/s
Proper motion (μ)	RA: −934.098±1.319^[3] mas/yr Dec.: −686.244±1.410^[3] mas/yr
Parallax (π)	249.9668 ± 0.7414 mas^[3]
Distance	13.05 ± 0.04 ly (4.00 ± 0.01 pc)
Absolute magnitude (M_V)	13.46
Details
Krüger 60 A
Mass	0.271^[5] `M`_☉
Radius	0.35^[6] `R`_☉
Luminosity	0.010^{[citation needed]} `L`_☉
Temperature	3,180^{[citation needed]} K
Metallicity	–0.04^[7]
Krüger 60 B
Mass	0.176^[5] `M`_☉
Radius	0.24^[6] `R`_☉
Luminosity	0.0034^{[citation needed]} `L`_☉
Temperature	2,890^{[citation needed]} K
Orbit^[8]
Primary	Krüger 60 A
Companion	Krüger 60 B
Period (P)	44.67 yr
Semi-major axis (a)	2.383″
Eccentricity (e)	0.410
Inclination (i)	167.2°
Longitude of the node (Ω)	154.5°
Periastron epoch (T)	1970.22
Argument of periastron (ω) (primary)	211.0°
Other designations
BD+56° 2783, GJ 860 A/B, HD 239960, HIP 110893, ADS 15972, G 232-075, LHS 3814/3815^[9]
Database references
SIMBAD	The system
	A
	B
Krüger 60 Location of Krüger 60 in the constellation Cepheus

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