HD 53680, HD 53705, and HD 53706

HD 53705 / 53706 / 53680 AB
Diagram showing star positions and boundaries of the constellation of Puppis and its surroundings
A star chart of the constellation of Puppis showing the position of HD 53705/53706/53680 (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Puppis
HD 53705
Right ascension 07h 03m 57.317s ± 11.59[1]
Declination −43° 36′ 28.94″ ± 2.46[1]
Apparent magnitude (V) 5.7033 ± 0.0320[1]
HD 53706
Right ascension 07h 03m 58.911s ± 110.53[1]
Declination −43° 36′ 40.56″ ± 79.27[1]
Apparent magnitude (V) 7.0459 ± 0.0908[1]
HD 53680
Right ascension 07 03h 50.236m ± 12.82[1]
Declination −43° 33′ 40.82″ ± 8.53[1]
Apparent magnitude (V) 8.8041 ± 0.0017
Characteristics
HD 53705 A
Spectral type G0V
B−V color index 0.624 ± 0.009
HD 53706 B
Spectral type K0V
B−V color index 0.779 ± 0.020
HD 53680 AB
Spectral type K5V/M(MS)
B−V color index 1.180 ± 0.012
Astrometry
HD 53705 A
Radial velocity (Rv)89.5[2] km/s
Proper motion (μ) RA: -104.10 ± 0.91[1] mas/yr
Dec.: 389.07 ± 1.32[1] mas/yr
Parallax (π)60.55 ± 1.04 mas[1]
Distance53.9 ± 0.9 ly
(16.5 ± 0.3 pc)
HD 53706 B
Radial velocity (Rv)89.0[2] km/s
Proper motion (μ) RA: -113.80 ± 9.01[1] mas/yr
Dec.: 417.98 ± 12.58[1] mas/yr
Parallax (π)47.99 ± 9.89 mas[1][note 1]
Distance68.0 ± 14.6 ly
(20.8 ± 4.5 pc)
HD 53680 AB
Radial velocity (Rv)89.065 ± 0.005[3] km/s
Proper motion (μ) RA: -75.64 ± 0.97[1] mas/yr
Dec.: 393.50 ± 1.46[1][note 2] mas/yr
Parallax (π)58.2 ± 0.8 mas[3]
Distance56.0 ± 0.8 ly
(17.2 ± 0.2 pc)
Absolute magnitude (MV)7.81 ± 0.03[4]
Orbit[3]
PrimaryHD 53680 A
CompanionHD 53680 B
Period (P)1688.6 ± 1.1 days
Semi-major axis (a)34.9 ± 3.2 mas
Eccentricity (e)0.475 ± 0.002
Inclination (i)163.6 +1.4
−1.7°
Longitude of the node (Ω)238.9 ± 2.9°
Argument of periastron (ω)
(secondary)		-133.2 ± 0.3°
Semi-amplitude (K1)
(primary)		1.2398 +0.0041
−0.0040 km/s
Details
HD 53705
Mass0.98 +0.02
−0.03[5] M☉
Radius1.14 +0.04
−0.03[5] R☉
Luminosity1.34 +0.11
−0.10 (log 0.127 ± 0.035)[2] L☉
Surface gravity (log g)4.34 +0.03
−0.04[5] cgs
Temperature5827 ± 44[2] K
Metallicity [Fe/H]-0.21 ± 0.03[2] dex
Rotational velocity (v sin i)1.6 ± 0.5[2] km/s
Age8.56 +1.44
−1.72[5] Gyr
HD 53706
Mass0.81 +0.04
−0.03[5] M☉
Radius0.79 +0.03
−0.03[5] R☉
Luminosity0.40 +0.25
−0.15 (log -0.40 ± 0.21)[2][note 3] L☉
Surface gravity (log g)4.59 +0.03
−0.05[5] cgs
Temperature5245 ± 44[2] K
Metallicity [Fe/H]-0.28 ± 0.03[2] dex
Rotational velocity (v sin i)0.3 ± 0.5[2] km/s
Age11.7 +3.3
−9.6 (weakly constrained)[2] Gyr
HD 53680 AB
Mass0.79 ± 0.02 / 0.22 ± 0.02[3][note 4] M☉
Radius0.64 ± 0.05[4] R☉
Temperature4460 ± 100[4] K
Metallicity [Fe/H]-0.29 ± 0.08[3] dex
Rotational velocity (v sin i)2.08 ± 0.31[3] km/s
Age0.7 - 9.4 (weakly constrained)[3] Gyr
Other designations
HD 53705: HD 53705, HIP 34065, HR 2667
HD 53706: HD 53706, HIP 34069, HR 2668
HD 53680: HD 53680, HIP 34052
Database references
HD 53705
SIMBADdata
HD 53706
SIMBADdata
HD 53680 AB
SIMBADdata

HD 53705/53706/53680 is a star system that lies approximately 54 light-years away in the constellation of Puppis. The system consists of four stars in two binaries, making it one of the nearest quadruple star systems.

  1. ^ a b c d e f g h i j k l m n o p Cite error: The named reference van Leeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i j k Cite error: The named reference Valenti2005 was invoked but never defined (see the help page).
  3. ^ a b c d e f g Cite error: The named reference Sahlmann2010 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Houdebine2011 was invoked but never defined (see the help page).
  5. ^ a b c d e f g Cite error: The named reference Takeda2007 was invoked but never defined (see the help page).


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