4 Lacertae

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title: "4 Lacertae" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["a-type-supergiants", "lacerta", "durchmusterung-objects", "flamsteed-objects", "henry-draper-catalogue-objects", "hipparcos-objects", "bright-star-catalogue-objects"] description: "Star in the constellation Lacerta" topic_path: "general/a-type-supergiants" source: "https://en.wikipedia.org/wiki/4_Lacertae" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Star in the constellation Lacerta ::

| image = |image=Lacerta constellation map.svg|alt=|float=center|width=240 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=4 Lacertae |x=530|y=585 | caption = Location of 4 Lacertae (circled in red) | epoch = J2000 | constell = Lacerta | ra = | dec = | appmag_v = 4.55 | type = Blue supergiant (blue loop) | class = A0 Ib | b-v = | u-b = | variable = | radial_v = | prop_mo_ra = ‍ | prop_mo_dec = ‍ | parallax = 1.2656 | p_error = 0.0891 | parallax_footnote = | absmag_v = −4.42 | source = | mass = | radius = 59 | luminosity = 62,000 | temperature = 11,800 | gravity = 2.18 | metal_fe = | rotational_velocity = | age_myr = | names = | Simbad = 4+Lac

4 Lacertae is a single blue supergiant star in the northern constellation Lacerta, located about 2,600 light years away. This object visible to the naked eye as a white-hued star with an apparent visual magnitude of 4.55. It is moving closer to the Earth with a heliocentric radial velocity of −26 km/s. This star is a suspected member of the Lac OB1 association.

This blue supergiant star has a stellar classification of A0 Ib. The surface abundances show evidence of material that has been processed via the CNO cycle at the core. It has ten times the mass of the Sun and has expanded to about 59 times the Sun's radius. The star is around 25 million years old and is spinning with a projected rotational velocity of 28 km/s. It is believed to be a blue loop star that has already spent time as a red supergiant after fusing the hydrogen within its core.

References

| title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | arxiv=1108.4971 | doi=10.1134/S1063773712050015 | s2cid=119257644 | postscript=. }}

| title=Lacerta OB1 Revisited | last1=Kaltcheva | first1=Nadia | postscript=. | journal=Publications of the Astronomical Society of the Pacific | volume=121 | issue=884 | pages=1045–1053 | date=October 2009 | doi=10.1086/606037 | bibcode=2009PASP..121.1045K | s2cid=120329065 | doi-access=free }}

| display-authors=1 | last1=Tetzlaff | first1=N. | last2=Neuhäuser | first2=R. | last3=Hohle | first3=M. M. | title=A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun | journal=Monthly Notices of the Royal Astronomical Society | volume=410 | issue=1 | pages=190–200 | date=January 2011 | doi=10.1111/j.1365-2966.2010.17434.x | doi-access=free | postscript=. | bibcode=2011MNRAS.410..190T | arxiv=1007.4883 | s2cid=118629873 }}

| display-authors=1 | last1=Gáspár | first1=András | last2=Rieke | first2=George H. | last3=Ballering | first3=Nicholas | title=The Correlation between Metallicity and Debris Disk Mass | journal=The Astrophysical Journal | volume=826 | issue=2 | pages=171 | year=2016 | bibcode=2016ApJ...826..171G | postscript=. | arxiv=1604.07403 | doi=10.3847/0004-637x/826/2/171| s2cid=119241004 | doi-access=free }}

| title=Spectral Analysis of 4 Lacertae and ν Cephei | last1=Yüce | first1=Kutluay | journal=Baltic Astronomy | volume=14 | pages=51–82 | year=2005 | bibcode=2005BaltA..14...51Y | postscript=. }}

| title=The Early A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation | journal=The Astrophysical Journal Supplement Series | last1=Gray | first1=R. O. | last2=Garrison | first2=R. F. | volume=65 | pages=581 | year=1987 | postscript=. | bibcode=1987ApJS...65..581G | doi=10.1086/191237 | doi-access=free }}

| title=A catalogue of multiplicity among bright stellar systems | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869 | date=2008 | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | postscript=. | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 }}

References

1. "4 Lac".
2. {{cite Gaia DR3. 1999776222304976384
3. (2008). "Bright OB stars in the Galaxy. IV. Stellar and wind parameters of early to late B supergiants". Astronomy and Astrophysics.

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::