Kappa Herculis information

κ Herculis
	; Historical view of the Hercules constellation showing Marfik (κ Her) as the hero's left "elbow".
Observation data; Epoch J2000 Equinox J2000
Constellation	Hercules
	κ Her A
Right ascension	16h 08m 04.52481s
Declination	17° 02′ 49.1150″
Apparent magnitude (V)	4.994
	κ Her B
Right ascension	16h 08m 04.95406s
Declination	17° 03′ 15.6853″
Apparent magnitude (V)	6.25
Characteristics
Spectral type	G7III + K0IV
U−B color index	+0.630[citation needed]
B−V color index	+0.931[citation needed]
Variable type	suspected
Astrometry
κ Her A
Radial velocity (Rv)	−10.50 km/s
Proper motion (μ)	RA: −34.062 mas/yr ; Dec.: −6.585 mas/yr
Parallax (π)	8.5601 ± 0.1338 mas
Distance	381 ± 6 ly ; (117 ± 2 pc)
Absolute magnitude (MV)	-45
κ Her B
Radial velocity (Rv)	+32.21 km/s
Proper motion (μ)	RA: −19.465 mas/yr ; Dec.: −25.142 mas/yr
Parallax (π)	8.1307 ± 0.0502 mas
Distance	401 ± 2 ly ; (123.0 ± 0.8 pc)
Details
κ Her A
Mass	3.17 M☉
Radius	16 R☉
Luminosity	148 L☉
Surface gravity (log g)	2.90 cgs
Temperature	5,119 K
Metallicity [Fe/H]	+0.04 dex
Rotational velocity (v sin i)	9.9 km/s
Age	309 Myr
κ Her B
Radius	11 R☉
Luminosity	55 L☉
Temperature	4,750 K
Metallicity [Fe/H]	+0.131 dex
Rotational velocity (v sin i)	1.0 km/s
Other designations
	Marsic, κ Her, 7 Herculis, CCDM J16081+1703, NSV 7471, AAVSO 1603+17, WDS 16081+1703
	A: HR 6008, HD 145001, HIP 79043, BD +77°2964
	B: HR 6009, HD 145000, HIP 79045, BD +77°2965
Database references
SIMBAD	κ Her
	κ Her A
	κ Her B

Kappa Herculis (κ Herculis, abbreviated Kappa Her, κ Her) is an optical double star in the constellation of Hercules. The two components, Kappa Herculis A (Marsic /ˈmɑːrsɪk/, the traditional name of the system)^[15] and B, were 27.3 arc seconds apart in 2000. Based on parallax measurements from the Hipparcos mission, κ Her A is about 113 parsecs (370 light-years) from the Sun and κ Her B is 600 parsecs (2,000 light-years); more recent parallax measurements suggest that B is around 5% more distant than A.

A faint third component Kappa Herculis C is just over 1 arc-minute away.^[16] It is at the same distance as κ Her A and has an almost-identical space motion.^[17]

The star 8 Herculis forms a naked eye pair with Kappa Herculis 14′ away.

^ ^a ^b Cite error: The named reference hipparcosA was invoked but never defined (see the help page).
^ Cite error: The named reference tycho2 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference hipparcosB was invoked but never defined (see the help page).
^ Cite error: The named reference ubv was invoked but never defined (see the help page).
^ Cite error: The named reference mk was invoked but never defined (see the help page).
^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
^ Cite error: The named reference pulkovo was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference dr2A was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference takeda was invoked but never defined (see the help page).
^ Cite error: The named reference coravel was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e ^f Cite error: The named reference dr2B was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference liu was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference medeiros was invoked but never defined (see the help page).
^ Cite error: The named reference franchini was invoked but never defined (see the help page).
^ Davis, George A. (1944). "The pronunciations, derivations, and meanings of a selected list of star names". Popular Astronomy. 52: 8–30. Bibcode:1944PA.....52....8D.
^ Cite error: The named reference wds was invoked but never defined (see the help page).
^ Cite error: The named reference dr2C was invoked but never defined (see the help page).

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

[tycho2-2] Cite error: The named reference tycho2 was invoked but never defined (see the help page).

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

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

[mk-5] Cite error: The named reference mk 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).

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

[dr2A-8] Cite error: The named reference dr2A was invoked but never defined (see the help page).

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

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

[dr2B-11] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference dr2B was invoked but never defined (see the help page).

[liu-12] Cite error: The named reference liu was invoked but never defined (see the help page).

[medeiros-13] Cite error: The named reference medeiros was invoked but never defined (see the help page).

[franchini-14] Cite error: The named reference franchini was invoked but never defined (see the help page).

[Davis44-15] Davis, George A. (1944). "The pronunciations, derivations, and meanings of a selected list of star names". Popular Astronomy. 52: 8–30. Bibcode:1944PA.....52....8D.

[wds-16] Cite error: The named reference wds was invoked but never defined (see the help page).

[dr2C-17] Cite error: The named reference dr2C was invoked but never defined (see the help page).

Observation data Epoch J2000 Equinox J2000
Historical view of the Hercules constellation showing Marfik (κ Her) as the hero's left "elbow".
Constellation	Hercules
κ Her A
Right ascension	16^h 08^m 04.52481^s^[1]
Declination	17° 02′ 49.1150″^[1]
Apparent magnitude (V)	4.994^[2]
κ Her B
Right ascension	16^h 08^m 04.95406^s^[3]
Declination	17° 03′ 15.6853″^[3]
Apparent magnitude (V)	6.25^[4]
Characteristics
Spectral type	G7III + K0IV^[5]
U−B color index	+0.630^{[citation needed]}
B−V color index	+0.931^{[citation needed]}
Variable type	suspected^[6]
Astrometry
κ Her A
Radial velocity (R_v)	−10.50^[7] km/s
Proper motion (μ)	RA: −34.062^[8] mas/yr Dec.: −6.585^[8] mas/yr
Parallax (π)	8.5601 ± 0.1338 mas^[8]
Distance	381 ± 6 ly (117 ± 2 pc)
Absolute magnitude (M_V)	-45^[9]
κ Her B
Radial velocity (R_v)	+32.21^[10] km/s
Proper motion (μ)	RA: −19.465^[11] mas/yr Dec.: −25.142^[11] mas/yr
Parallax (π)	8.1307 ± 0.0502 mas^[11]
Distance	401 ± 2 ly (123.0 ± 0.8 pc)
Details
κ Her A
Mass	3.17^[12] `M`_☉
Radius	16^[8] `R`_☉
Luminosity	148^[9] `L`_☉
Surface gravity (log g)	2.90^[12] cgs
Temperature	5,119^[12] K
Metallicity [Fe/H]	+0.04^[12] dex
Rotational velocity (v sin i)	9.9^[13] km/s
Age	309^[9] Myr
κ Her B
Radius	11^[11] `R`_☉
Luminosity	55^[11] `L`_☉
Temperature	4,750^[11] K
Metallicity [Fe/H]	+0.131^[14] dex
Rotational velocity (v sin i)	1.0^[13] km/s
Other designations
Marsic, κ Her, 7 Herculis, CCDM J16081+1703, NSV 7471, AAVSO 1603+17, WDS 16081+1703
A: HR 6008, HD 145001, HIP 79043, BD +77°2964
B: HR 6009, HD 145000, HIP 79045, BD +77°2965
Database references
SIMBAD	κ Her
	κ Her A
	κ Her B

Kappa Herculis information

and 23 Related for: Kappa Herculis information

Kappa Herculis

Beta Herculis

Alpha Serpentis

List of Chinese star names

Epsilon Ophiuchi

Delta Ophiuchi

Asteroseismology

Table of stars with Bayer designations

Pole star

List of brightest natural objects in the sky

Thuban

Subgiant

List of proper names of stars

Cepheid variable

Pyxis

Petrozavodsk phenomenon

Bayer designation

List of nearest supergiants

Instability strip

List of Arabic star names

List of nearest stars by spectral type

Type II Cepheid

Tests of general relativity