Delta Herculis information

δ Herculis
	Location of δ Herculis (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Hercules
Right ascension	17h 15m 01.9106s
Declination	24° 50′ 21.135″
Apparent magnitude (V)	3.126
Characteristics
Spectral type	A3IV
U−B color index	+0.7
B−V color index	+0.08
Astrometry
Radial velocity (Rv)	−40.0 km/s
Proper motion (μ)	RA: -21.14 mas/yr ; Dec.: -157.68 mas/yr
Parallax (π)	43.41 ± 0.15 mas
Distance	75.1 ± 0.3 ly ; (23.04 ± 0.08 pc)
Absolute magnitude (MV)	+1.31
Details
Mass	2.4 M☉
Radius	2.2 R☉
Luminosity	38 L☉
Temperature	9,620 ± 350 K
Rotational velocity (v sin i)	270 km/s
Age	370 Myr
Other designations
	Sarin, δ Her, 65 Her, BD 25° 3221, CCDM J17151+2451A, FK5 641, GC 23294, HD 156164, HIP 84379, HR 6410, SAO 84951.
Database references
SIMBAD	data

Delta Herculis (δ Herculis, abbreviated Delta Her, δ Her) is a multiple star system in the constellation of Hercules. Its light produces to us apparent magnitude 3.12, as such the third-brightest star in the large, fairly dim constellation. Based on parallax measurement taken during the Hipparcos mission, it is approximately 23.1 parsecs (75 light-years) from the Sun.

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^ ^a ^b Cite error: The named reference MERMILLIOD was invoked but never defined (see the help page).
^ Cite error: The named reference LEEUWEN was invoked but never defined (see the help page).
^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference aass85_3_1015 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference KALER was invoked but never defined (see the help page).

[SIMBAD-1] ^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

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

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

[Anderson2012-4] Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).

[aass85_3_1015-5] Cite error: The named reference aass85_3_1015 was invoked but never defined (see the help page).

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

Observation data Epoch J2000 Equinox J2000
Location of δ Herculis (circled)
Constellation	Hercules
Right ascension	17^h 15^m 01.9106^s^[1]
Declination	24° 50′ 21.135″^[1]
Apparent magnitude (V)	3.126^[1]
Characteristics
Spectral type	A3IV^[1]
U−B color index	+0.7^[2]
B−V color index	+0.08^[2]
Astrometry

Radial velocity (R_v)	−40.0^[1] km/s
Proper motion (μ)	RA: -21.14^[1] mas/yr Dec.: -157.68^[1] mas/yr
Parallax (π)	43.41 ± 0.15 mas^[3]
Distance	75.1 ± 0.3 ly (23.04 ± 0.08 pc)
Absolute magnitude (M_V)	+1.31^[4]

Details

Mass	2.4^[5] `M`_☉
Radius	2.2^[5] `R`_☉
Luminosity	38^[5] `L`_☉
Temperature	9,620 ± 350^[5] K
Rotational velocity (v sin i)	270^[6] km/s
Age	370^[6] Myr

Other designations
Sarin, δ Her, 65 Her, BD 25° 3221, CCDM J17151+2451A, FK5 641, GC 23294, HD 156164, HIP 84379, HR 6410, SAO 84951.
Database references
SIMBAD	data

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