5 Lacertae

{{Starbox image

| image=

{{Location mark

|image=Lacerta constellation map.svg|alt=|float=center|width=220

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=5 Lacertae

|x=498|y=654

}}

|caption=Location of 5 Lacertae (circled)

}}

{{Starbox observe

| epoch = J2000

| constell = Lacerta

| ra = {{RA|22|29|31.823}}

| dec = {{DEC|+47|42|24.79}}

| appmag_v = 4.36

}}

{{Starbox character

| class = K6–M0I + B7/8V

| u-b = +1.11

| b-v = +1.68

| variable = LC

}}

{{Starbox astrometry

| radial_v = {{val|−3.4|0.2}}

| prop_mo_ra = {{val|−2.554}}

| prop_mo_dec = {{val|−5.372}}

| pm_footnote =

| parallax = 1.4838

| p_error = 0.1383

| parallax_footnote =

| dist_pc = {{val|665|62|54}}

| dist_ly = {{val|2170|200|180|fmt=commas}}

| dist_footnote =

| absmag_v = −4.16

}}

{{Starbox orbit

| reference =

| period = {{val|41.95|0.20}}

| eccentricity = {{val|0.49|0.01}}

| periastron = {{val|2427578.3|260|u=JD}}

| periarg = {{val|323|5.0}}

| k1 = {{val|12.2|1.2}}

| k2 = {{val|112.0|8.2}}

}}

{{Starbox detail

| source =

| component1 = 5 Lacertae A

| mass = {{val|5.11|0.18}}

| radius = {{Val|427|36|44}}

| luminosity = 25,100{{efn|1=10^4.4 = 25118.86}}

| gravity =

| temperature = 3,790{{efn|1=10^3.57863921 = 3,790}}

| metal_fe =

| rotation =

| rotational_velocity = 50

| age_myr = {{val|110|10}}

| component2 = 5 Lacertae B

| mass2 =

| radius2 =

| luminosity2 =

| luminosity_bolometric2 =

| luminosity_visual2 =

| gravity2 =

| temperature2 =

| metal2_fe =

| rotation2 =

| rotational_velocity2 = 89

| age_gyr2 =

}}

{{Starbox catalog

| names = {{odlist | V=V412 Lac | BD=+46°3719 | FK5=3799 | HD=213310/1 | HIP=111022 | HR=8572 | SAO=52055 }}

}}

{{Starbox reference

| Simbad = HD+213310

}}

Image:5 Lacertae.jpg

5 Lacertae (5 Lac) is a spectroscopic binary in the constellation Lacerta. Its apparent magnitude is 4.36.

Variability

File:V412LacLightCurve.png for V412 Lacertae, plotted from Hipparcos data]]

5 Lacertae is a slow irregular variable star with a small amplitude. Photometry from the Hipparcos satellite showed brightness changes between Hipparcos magnitudes 4.39 and 4.56 with no clear periodicity. It was given the variable star designation V412 Lacertae in 1999 in a special name-list dedicated to variables detected from Hipparcos.

Characteristics

The spectrum of 5 Lacertae clearly indicates both a hot component and a cooler component, recognised even in early spectra. Published spectral types for the brighter cool component vary from K4 to M0, with a luminosity class of giant or supergiant. The hotter star is generally classed as a relatively unevolved late B or early A star, but an automated classification program gave it a spectral class of B2V.

Radial velocity variations in the absorption lines from the two separate stars have been measured to determine the orbit. This has an unusually long period of almost 42 years. The two stars have an eccentric orbit with a projected axis of about 15 au.

Notes

References

{{reflist|refs=

{{cite journal | title=Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer | last1=Baines | first1=Ellyn K. | last2=Armstrong | first2=J. Thomas | last3=Schmitt | first3=Henrique R. | last4=Zavala | first4=R. T. | last5=Benson | first5=James A. | last6=Hutter | first6=Donald J. | last7=Tycner | first7=Christopher | last8=Belle | first8=Gerard T. van | display-authors=1 | journal=The Astronomical Journal | volume=155 | issue=1 | at=30 | year=2018 | arxiv=1712.08109 | bibcode=2018AJ....155...30B | doi=10.3847/1538-3881/aa9d8b | s2cid=119427037 | doi-access=free }}

{{Cite journal |last1=Pantaleoni González |first1=M. |last2=Maíz Apellániz |first2=J. |last3=Barbá |first3=R. H. |last4=Negueruela |first4=I. |date=2020-01-01 |title=A Catalog of Galactic Multiple Systems with a Red Supergiant and a B Star |bibcode=2020RNAAS...4...12P |arxiv=2001.11680 |journal=Research Notes of the American Astronomical Society |volume=4 |issue=1 |pages=12 |doi=10.3847/2515-5172/ab712b |doi-access=free |issn=2515-5172}}

{{Cite journal |last1=Bailer-Jones |first1=C. A. L. |last2=Rybizki |first2=J. |last3=Fouesneau |first3=M. |last4=Demleitner |first4=M. |last5=Andrae |first5=R. |date=2021-03-01 |title=Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3 |journal=The Astronomical Journal |volume=161 |issue=3 |pages=147 |doi=10.3847/1538-3881/abd806 |doi-access=free |arxiv=2012.05220 |bibcode=2021AJ....161..147B |issn=0004-6256}} Data about this star can be seen [https://dc.zah.uni-heidelberg.de/gedr3dist/q/cone/form here].

{{cite journal | title=Observations of a second maximum for the very long period spectroscopic binary 5 Lac | journal=Publications of the Astronomical Society of the Pacific | volume=90 | pages=184–187 | year=1978 | last1=Hendry | first1=E. M. | bibcode=1978PASP...90..184H | doi=10.1086/130304 | doi-access=free }}

{{cite journal | title=Validation of the new Hipparcos reduction | last1=van Leeuwen | first1=F. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | year=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | s2cid=18759600 }}[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=110652 Vizier catalog entry ]

{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}

{{Cite journal |last1=Baines |first1=Ellyn K. |last2=Clark |first2=James H. |last3=Kingsley |first3=Bradley I. |last4=Schmitt |first4=Henrique R. |last5=Stone |first5=Jordan M. |date=2025-05-07 |title=Vintage NPOI: New and Updated Angular Diameters for 145 Stars |journal=The Astronomical Journal |language=en |volume=169 |issue=6 |pages=293 |doi=10.3847/1538-3881/adc930 |doi-access=free |bibcode=2025AJ....169..293B |arxiv=2506.02912 |issn=1538-3881}}

{{cite journal|author=Kazarovets, E. V.|author2=Samus, N. N.|author3=Durlevich, O. V.|author4=Frolov, M. S.|author5=Antipin, S. V.|author6=Kireeva, N. N.|author7=Pastukhova, E. N.|date=1999|title=The 74th Special Name-list of Variable Stars|journal=Information Bulletin on Variable Stars|volume=4659|issue=4659 |pages=1| bibcode=1999IBVS.4659....1K}}

{{Cite journal |last1=Healy |first1=Sarah |last2=Horiuchi |first2=Shunsaku |last3=Molla |first3=Marta Colomer |last4=Milisavljevic |first4=Dan |last5=Tseng |first5=Jeff |last6=Bergin |first6=Faith |last7=Weil |first7=Kathryn |last8=Tanaka |first8=Masaomi |date=2024-03-23 |title=Red Supergiant Candidates for Multimessenger Monitoring of the Next Galactic Supernova |journal=Monthly Notices of the Royal Astronomical Society |volume=529 |issue=4 |pages=3630–3650 |doi=10.1093/mnras/stae738 |doi-access=free |issn=0035-8711|arxiv=2307.08785 }}

{{cite journal|doi=10.1007/s00159-012-0051-2|arxiv=1204.2572|title=Interferometric observations of rapidly rotating stars|journal=The Astronomy and Astrophysics Review|volume=20|issue=1|pages=51|year=2012|last1=Van Belle|first1=Gerard T|bibcode=2012A&ARv..20...51V|s2cid=119273474}}

{{cite journal | bibcode=1995yCat.5050....0H | title=VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991) | journal=VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H | volume=5050 | last1=Hoffleit | first1=D. | last2=Warren | first2=W. H. | year=1995 }}

{{cite web |title=Hipparcos Tools Interactive Data Access |url=https://www.cosmos.esa.int/web/hipparcos/interactive-data-access |website=Hipparcos |publisher=ESA |access-date=8 December 2021}}

{{cite journal|bibcode=2014yCat....1.2023S|title=VizieR On-line Data Catalog: Catalogue of Stellar Spectral Classifications|journal=VizieR On-line Data Catalog|first=B. A.|last=Skiff|year=2014}}

}}

Category:Lacerta

Category:K-type supergiants

Category:B-type main-sequence stars

Category:Slow irregular variables

Category:Spectroscopic binaries

Lacertae, 05

Lacertae, V412

Category:Durchmusterung objects

111022

8572

213310 1