Lambda Serpentis

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Star in the constellation Serpens

title: "Lambda Serpentis" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["g-type-main-sequence-stars", "solar-type-stars", "suspected-variables", "planetary-systems-with-one-confirmed-planet", "serpens", "bayer-objects", "durchmusterung-objects", "flamsteed-objects", "henry-draper-catalogue-objects", "hipparcos-objects", "bright-star-catalogue-objects", "gliese-and-gj-objects"] description: "Star in the constellation Serpens" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/Lambda_Serpentis" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Star in the constellation Serpens ::

| image = | image=Serpens Caput IAU.svg | float=center | width=250 | position=right | mark=Red circle.svg | mark_width=10 | mark_link=λ Ser | x%=46.0 | y%=51.0 | caption=Location of λ Serpentis (circled) | epoch = J2000 | ra = | dec = | appmag_v = 4.43 | constell = Serpens | class = G0 V | b-v = +0.60 | u-b = +0.11 | variable = Suspected | radial_v = −66.4 | prop_mo_ra = | prop_mo_dec = | pm_footnote= | parallax = 83.92 | p_error = 0.15 | parallax_footnote = | absmag_v = 4.01 | source = | mass = | radius = | temperature = | luminosity = | gravity = 4.09 | metal_fe = −0.03 | age_gyr = | rotational_velocity = 3 | rotation = days | names = | Simbad=lam+Ser | NSTED=HD-141004

Lambda Serpentis, Latinized from λ Serpentis, is a star in the constellation Serpens, in its head (Serpens Caput). It has an apparent visual magnitude of 4.43, making it visible to the naked eye. Based upon parallax measurements, this star lies at a distance of about 38.9 ly from Earth. Lambda Serpentis is moving toward the Solar System with a radial velocity of 66.4 km s−1. In about 166,000 years, this system will make its closest approach of the Sun at a distance of 7.371 +/-, before moving away thereafter.

This star is 36% larger and 9% more massive than the Sun, although it has a similar stellar classification. It is shining with nearly double the Sun's luminosity and this energy is being radiated from the star's outer atmosphere at an effective temperature of 5,901 K. A periodicity of 1837 days (5.03 years) was suspected by Morbey & Griffith (1987), but it is probably bound to stellar activity. However, McDonald Observatory team has set limits to the presence of one or more exoplanets around Lambda Serpentis with masses between 0.16 and 2 Jupiter masses and average separations spanning between 0.05 and 5.2 Astronomical Units.

Planetary system

In 2020, a candidate planet was detected orbiting Lambda Serpentis (HD 141004). With a minimum mass of 0.043 (13.6 ) and an orbital period of 15 days, this would most likely be a hot Neptune. The planet was confirmed in 2021.

| name = Lambda Serpentis | table_ref = | exoplanet = b | mass = ≥0.0428 | semimajor = 0.1238 | period = 15.5083 | eccentricity = 0.16

References

References

  1. (July 2009). "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics". Astronomy and Astrophysics.
  2. "lam Ser -- Spectroscopic binary". [[Centre de Données astronomiques de Strasbourg]].
  3. Johnson, H. L.. (1953). "Fundamental stellar photometry for standards of spectral type on the revised system of the Yerkes spectral atlas". Astrophysical Journal.
  4. Fuhrmann, Klaus. (October 1998). "Nearby stars of the Galactic disk and halo". Astronomy and Astrophysics.
  5. Wilson, Ralph Elmer. (1953). "General Catalogue of Stellar Radial Velocities". [[Carnegie Institution of Washington]].
  6. (1970). "A catalogue of stellar rotational velocities". Contributi Osservatorio Astronomico di Padova in Asiago.
  7. (2023-09-21). "Asteroseismology and Spectropolarimetry of the Exoplanet Host Star λ Serpentis". The Astronomical Journal.
  8. Morbey, C. L.. (1987). "On the reality of certain spectroscopic orbits". Astrophysical Journal.
  9. (April 2006). "Simulating observable comets. III. Real stellar perturbers of the Oort cloud and their output". Astronomy and Astrophysics.
  10. (2021). "Understanding the Impacts of Stellar Companions on Planet Formation and Evolution: A Survey of Stellar and Planetary Companions within 25 pc". [[The Astronomical Journal]].
  11. (2021). "The California Legacy Survey. I. A Catalog of 178 Planets from Precision Radial Velocity Monitoring of 719 Nearby Stars over Three Decades". The Astrophysical Journal Supplement Series.
  12. {{cite Gaia DR3. 4430238051199001216

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g-type-main-sequence-starssolar-type-starssuspected-variablesplanetary-systems-with-one-confirmed-planetserpensbayer-objectsdurchmusterung-objectsflamsteed-objectshenry-draper-catalogue-objectshipparcos-objectsbright-star-catalogue-objectsgliese-and-gj-objects