Back Marfik AST Lambda del Serpentari Catalan Marfik German Marfik Spanish مرفق‌الحوا Persian Lambda Ophiuchi French Lambda Ophiuchi ID Lambda Ophiuchi Italian へびつかい座ラムダ星 Japanese Marfik (Ophiuchus) LB

Lambda Ophiuchi

Lambda Ophiuchi
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 16h 30m 54.82314s[1]
Declination +01° 59′ 02.1209″[1]
Apparent magnitude (V) 3.82[2]
(4.18 (A) + 5.22 (B) + 11.0 (C))[3]
Characteristics
Spectral type A0V + A4V[4]
U−B color index +0.01[5]
B−V color index +0.022±0.014[2]
Variable type Suspected[6]
Astrometry
Radial velocity (Rv)−16.0±1.5[2] km/s
Proper motion (μ) RA: −30.98[1] mas/yr
Dec.: −73.42[1] mas/yr
Parallax (π)18.84±0.55 mas[1]
Distance173 ± 5 ly
(53 ± 2 pc)
Absolute magnitude (MV)0.20[2]
Orbit[7]
PrimaryA
CompanionB
Period (P)192 yr
Semi-major axis (a)0.91″[7]
(47.8 AU)[8]
Eccentricity (e)0.611
Inclination (i)23.0°
Longitude of the node (Ω)53.3°
Periastron epoch (T)B 1939.7
Argument of periastron (ω)
(secondary)		157.5°
Orbit[8]
PrimaryAa
CompanionAb
Period (P)1 month
Semi-major axis (a)0.32 AU
Details[8]
Aa
Mass2.39 M☉
Radius2.45 R☉
Luminosity76.0+5.1
−4.8[9] L☉
Temperature9,550 K
Rotational velocity (v sin i)138[9] km/s
Ab
Mass1.62 M☉
Radius1.56 R☉
Temperature7,710 K
B
Mass1.82 M☉
Radius1.73 R☉
Temperature8,330 K
C
Mass0.62 M☉
Radius0.58[10] R☉
Luminosity0.09[10] L☉
Temperature4,157[10] K
Other designations
λ Oph, 10 Oph, NSV 7784, BD+02°3118, HD 148857, HIP 80883, HR 6149, SAO 121658, ADS 10087, WDS 16309+0159[11]
Database references
SIMBADdata

λ Ophiuchi, Latinized as Lambda Ophiuchi, is a quadruple star system[8] in the equatorial constellation of Ophiuchus. It has the traditional name Marfik /ˈmɑːrfɪk/,[12] which now applies exclusively to the primary component.[13] The system is visible to the naked eye as a faint point of light with an apparent visual magnitude of 3.82.[2] It is located approximately 173 light-years from the Sun, based on its parallax,[1] but is drifting closer with a radial velocity of –16 km/s.[2]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Edwards1976 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference clpl4 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference orb was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Waisberg2023 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference dr2c was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Kunitzsch was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference IAU-LSN was invoked but never defined (see the help page).

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