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{{short description|Star in the constellation Ursa Major}}
{{one source|date=December 2015}}
{{Starbox begin}}
{{Expand German|date=June 2011|Sidus Ludoviciana}}
{{Starbox image
⚫
'''Sidus Ludoviciana''' is an 8th-magnitude star in the [[Asterism (astronomy)|asterism]] of the [[Big Dipper]] in the constellation [[Ursa Major]], halfway between [[Mizar and Alcor|Mizar]] and [[Mizar and Alcor|Alcor]]. It was discovered on 2 December 1722 by [[Johann Georg Liebknecht]], who mistook it for a planet and named it after [[Louis V, Landgrave of Hesse-Darmstadt]]. A line-of-sight companion with Mizar and Alcor (with a spectral type similar to the latter), it is roughly five times more distant.<ref>http://www.leosondra.cz/en/mizar/</ref>
| image=
{{Location mark
| image=Mizar, Alcor and Sidus Ludoviciana.jpg
| float=center | width=280 | position=right
| mark=Red circle.svg | mark_width=10 | mark_link=Sidus Ludoviciana
| x%=43.4 | y%=75.8
}}
| caption=Location of Sidus Ludoviciana (circled)
}}
{{Starbox observe
| epoch = [[J2000.0]]
| constell = [[Ursa Major]]
| ra = {{RA|13|24|51.8521}}<ref name=dr3/>
| dec = {{DEC|+54|53|50.841}}<ref name=dr3/>
| appmag_v = +7.58<ref name=tycho2/>
}}
{{Starbox character
| class = A5-F0<ref name=hr-cds/><ref name=grenier/>
}}
{{Starbox astrometry
| radial_v=−4.9<ref name=grenier/>
| prop_mo_ra=−20.171<ref name=dr3/>
| prop_mo_dec=−5.330<ref name=dr3/>
| parallax = 10.9650
| p_error = 0.0281
| parallax_footnote = <ref name=dr3/>
| absmag_v =
}}
{{Starbox detail
| mass = 1.5<ref name=dr3/>
| temperature = 7,223<ref name=dr3/>
| radius = 1.6<ref name=dr3/>
| luminosity = 6.2<ref name=dr3/>
| gravity = 4.13<ref name=dr3/>
| age_myr = 961<ref name=dr3/>
}}
{{Starbox catalog
| names = Sidus Ludoviciana, [[Henry Draper Catalogue|HD]]&nbsp;116798, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;28748, [[Bonner Durchmusterung|BD]]+55°1602, [[Boss General catalogue|GC]]&nbsp;18150, [[Tycho-2 Catalogue|TYC]]&nbsp;3850-257-1, [[2MASS]]&nbsp;J13245185+5453509
}}
{{Starbox reference
| Simbad = HD+116798
}}
{{Starbox end}}


[[File:Thomas Bresson - Mizar+alcor (by).jpg|thumb|left|Sidus Ludoviciana between the brighter [[Mizar and Alcor]] (north is towards the right)]]
⚫
'''Sidus Ludoviciana''' {{IPAc-en|'|s|ai|d|@|s|_|,|lj|uː|d|ou|,|v|I|s|i|'|ei|n|@}}{{cn|date=September 2019}}, also known as HD 116798<ref>{{Cite news|date=2009-12-11|title=The Big Dipper Adds a Star|url=https://skyandtelescope.org/astronomy-news/the-big-dipper-adds-a-star/|access-date=2021-07-28|website=Sky & Telescope|language=en-US}}</ref> is an 8th-magnitude [[giant star]] in the [[Asterism (astronomy)|asterism]] of the [[Big Dipper]] in the constellation [[Ursa Major]], halfway between [[Mizar and Alcor|Mizar]] and [[Mizar and Alcor|Alcor]]. It was discovered on 2 December 1722 by [[Johann Georg Liebknecht]], who mistook it for a planet and named it after [[Louis V, Landgrave of Hesse-Darmstadt]]. A line-of-sight companion with Mizar and Alcor (with a spectral type similar to the latter), it is roughly four times more distant. It has the spectral type A8/F0 III.<ref name=grenier/> That spectral class suggests it is a [[giant star]], but [[stellar evolution|evolutionary models]] place it on the [[main sequence]].<ref name=dr3/>

The star is six times more luminous than the [[Sun]], 1.6 times its radius, and has a [[effective temperature|surface temperature]] of {{val|7,200|fmt=commas|ul=K}}. Spectral classification based on a spectrum taken for radial velocity measurement tentatively determined a spectral and luminosity class of A8/F0III,<ref name=grenier/> which would indicate that it has exhausted its core hydrogen and started to evolve away from the [[main sequence]], however [[giant stars]] of this type should be at least ten times more luminous than measured for Sidus Ludoviciana.
{{clear left}}
== References ==
== References ==
{{Reflist}}
{{Reflist|refs=

<ref name=dr3>{{cite Gaia DR3|1563586799775391104}}</ref>

<ref name=hr-cds>Henry Draper Catalogue and Extension, A. J. Cannon and E. C. Pickering, [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://cdsarc.u-strasbg.fr/viz-bin/Cat?III/135A III/135A].</ref>

<ref name=grenier>{{cite journal|bibcode=1999A&AS..137..451G|title=Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS|journal=Astronomy and Astrophysics Supplement|volume=137|issue=3|pages=451|last1=Grenier|first1=S.|last2=Baylac|first2=M.-O.|last3=Rolland|first3=L.|last4=Burnage|first4=R.|last5=Arenou|first5=F.|last6=Briot|first6=D.|last7=Delmas|first7=F.|last8=Duflot|first8=M.|last9=Genty|first9=V.|last10=Gómez|first10=A. E.|last11=Halbwachs|first11=J.-L.|last12=Marouard|first12=M.|last13=Oblak|first13=E.|last14=Sellier|first14=A.|year=1999|doi=10.1051/aas:1999489|url=https://hal.archives-ouvertes.fr/hal-02053966/file/Grenier%20et%20al.%20-%201999%20-%20Radial%20velocities.%20Measurements%20of%202800%20B2-F5%20star.pdf|doi-access=free}}</ref>

<ref name=tycho2>{{cite journal |bibcode=2000A&A...355L..27H |title=The Tycho-2 catalogue of the 2.5 million brightest stars |journal=Astronomy and Astrophysics |volume=355 |pages=L27 |last1=Høg |first1=E. |last2=Fabricius |first2=C. |last3=Makarov |first3=V. V. |last4=Urban |first4=S. |last5=Corbin |first5=T. |last6=Wycoff |first6=G. |last7=Bastian |first7=U. |last8=Schwekendiek |first8=P. |last9=Wicenec |first9=A. |year=2000 }}</ref>

}}


==External links==
==External links==
* [http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=HD116798 SIMBAD-Entry] ([[SIMBAD]])
* [http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=HD116798 SIMBAD-Entry] ([[SIMBAD]])
* [http://leo.astronomy.cz/mizar/article.htm Leos Ondra: A New View of Mizar]
* [http://leo.astronomy.cz/mizar/article.htm Leos Ondra: A New View of Mizar] {{Webarchive|url=https://web.archive.org/web/20080307111656/http://leo.astronomy.cz/mizar/article.htm |date=2008-03-07 }}
* [http://www.waa.at/bericht/2005/05/20050502wvo23.html Astrophoto]
* [http://www.waa.at/bericht/2005/05/20050502wvo23.html Astrophoto]


{{Stars of Ursa Major}}
{{Stars of Ursa Major}}


[[Category:Ursa Major (constellation)]]
[[Category:Ursa Major]]
[[Category:Henry Draper Catalogue objects|116798]]
[[Category:Henry Draper Catalogue objects|116798]]
[[Category:A-type stars]]
[[Category:A-type giants]]
[[Category:F-type giants]]

[[Category:Durchmusterung objects|BD+55 1602]]

[[Category:2MASS objects|J13245185+5453509]]
{{Star-stub}}
[[Category:Stars with proper names]]

Latest revision as of 11:59, 14 May 2023

Sidus Ludoviciana
Location of Sidus Ludoviciana (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major
Right ascension 13h 24m 51.8521s[1]
Declination +54° 53′ 50.841″[1]
Apparent magnitude (V) +7.58[2]
Characteristics
Spectral type A5-F0[3][4]
Astrometry
Radial velocity (Rv)−4.9[4] km/s
Proper motion (μ) RA: −20.171[1] mas/yr
Dec.: −5.330[1] mas/yr
Parallax (π)10.9650 ± 0.0281 mas[1]
Distance297.5 ± 0.8 ly
(91.2 ± 0.2 pc)
Details
Mass1.5[1] M☉
Radius1.6[1] R☉
Luminosity6.2[1] L☉
Surface gravity (log g)4.13[1] cgs
Temperature7,223[1] K
Age961[1] Myr
Other designations
Sidus Ludoviciana, HD 116798, SAO 28748, BD+55°1602, GC 18150, TYC 3850-257-1, 2MASS J13245185+5453509
Database references
SIMBADdata
Sidus Ludoviciana between the brighter Mizar and Alcor (north is towards the right)

Sidus Ludoviciana /ˈsaɪdəs ˌljuːdoʊˌvɪsiˈeɪnə/[citation needed], also known as HD 116798[5] is an 8th-magnitude giant star in the asterism of the Big Dipper in the constellation Ursa Major, halfway between Mizar and Alcor. It was discovered on 2 December 1722 by Johann Georg Liebknecht, who mistook it for a planet and named it after Louis V, Landgrave of Hesse-Darmstadt. A line-of-sight companion with Mizar and Alcor (with a spectral type similar to the latter), it is roughly four times more distant. It has the spectral type A8/F0 III.[4] That spectral class suggests it is a giant star, but evolutionary models place it on the main sequence.[1]

The star is six times more luminous than the Sun, 1.6 times its radius, and has a surface temperature of 7,200 K. Spectral classification based on a spectrum taken for radial velocity measurement tentatively determined a spectral and luminosity class of A8/F0III,[4] which would indicate that it has exhausted its core hydrogen and started to evolve away from the main sequence, however giant stars of this type should be at least ten times more luminous than measured for Sidus Ludoviciana.

References

[edit]
  1. ^ a b c d e f g h i j k l Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H.
  3. ^ Henry Draper Catalogue and Extension, A. J. Cannon and E. C. Pickering, CDS ID III/135A.
  4. ^ a b c d Grenier, S.; Baylac, M.-O.; Rolland, L.; Burnage, R.; Arenou, F.; Briot, D.; Delmas, F.; Duflot, M.; Genty, V.; Gómez, A. E.; Halbwachs, J.-L.; Marouard, M.; Oblak, E.; Sellier, A. (1999). "Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS" (PDF). Astronomy and Astrophysics Supplement. 137 (3): 451. Bibcode:1999A&AS..137..451G. doi:10.1051/aas:1999489.
  5. ^ "The Big Dipper Adds a Star". Sky & Telescope. 2009-12-11. Retrieved 2021-07-28.
[edit]
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