Sidus Ludoviciana: Difference between revisions

Sidus Ludoviciana
	Location of Sidus Ludoviciana (circled)
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Ursa Major
Right ascension	13h 24m 51.8521s
Declination	+54° 53′ 50.841″
Apparent magnitude (V)	+7.58
Characteristics
Spectral type	A5-F0
Astrometry
Radial velocity (Rv)	−4.9 km/s
Proper motion (μ)	RA: −20.171 mas/yr ; Dec.: −5.330 mas/yr
Parallax (π)	10.9650 ± 0.0281 mas
Distance	297.5 ± 0.8 ly ; (91.2 ± 0.2 pc)
Details
Mass	1.5 M☉
Radius	1.6 R☉
Luminosity	6.2 L☉
Surface gravity (log g)	4.13 cgs
Temperature	7,223 K
Age	961 Myr
Other designations
	Sidus Ludoviciana, HD 116798, SAO 28748, BD+55°1602, GC 18150, TYC 3850-257-1, 2MASS J13245185+5453509
Database references
SIMBAD	data

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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

^ ^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.
^ 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.
^ Henry Draper Catalogue and Extension, A. J. Cannon and E. C. Pickering, CDS ID III/135A.
^ ^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.
^ "The Big Dipper Adds a Star". Sky & Telescope. 2009-12-11. Retrieved 2021-07-28.

External links

SIMBAD-Entry (SIMBAD)
Leos Ondra: A New View of Mizar Archived 2008-03-07 at the Wayback Machine
Astrophoto

[dr3-1] ^ ^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.

[tycho2-2] 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.

[hr-cds-3] Henry Draper Catalogue and Extension, A. J. Cannon and E. C. Pickering, CDS ID III/135A.

[grenier-4] 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.

[1]

[2]

[3]

[4]

[5]

@@ Line 1: / Line 1: @@
+{{short description|Star in the constellation Ursa Major}}
-{{Starbox begin
+{{Starbox begin}}
-| name = Sidus Ludoviciana
+{{Starbox image
+ | 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|51.8516}}<ref name=dr2/>
+| ra = {{RA|13|24|51.8521}}<ref name=dr3/>
-| dec = {{DEC|+54|53|50.839}}<ref name=dr2/>
+| dec = {{DEC|+54|53|50.841}}<ref name=dr3/>
 | appmag_v = +7.58<ref name=tycho2/>
 }}
 {{Starbox character
-| class = A8/F0III<ref name=grenier/>
+| class = A5-F0<ref name=hr-cds/><ref name=grenier/>
 }}
 {{Starbox astrometry
-| radial_v={{val|-4.9}}<ref name=grenier/>
+| radial_v=−4.9<ref name=grenier/>
-| prop_mo_ra={{val|-19.910}}<ref name=dr2/>
+| prop_mo_ra=−20.171<ref name=dr3/>
-| prop_mo_dec={{val|-5.202}}<ref name=dr2/>
+| prop_mo_dec=−5.330<ref name=dr3/>
-| parallax = 10.8536
+| parallax = 10.9650
-| p_error = 0.0280
+| p_error = 0.0281
-| parallax_footnote = <ref name=dr2/>
+| parallax_footnote = <ref name=dr3/>
 | absmag_v =
 }}
 {{Starbox detail
-| mass =
+| mass = 1.5<ref name=dr3/>
-| temperature = 7,167<ref name=dr2/>
+| temperature = 7,223<ref name=dr3/>
-| radius = 1.61<ref name=dr2/>
+| radius = 1.6<ref name=dr3/>
-| luminosity = 6.159<ref name=dr2/>
+| luminosity = 6.2<ref name=dr3/>
+| gravity = 4.13<ref name=dr3/>
+| age_myr = 961<ref name=dr3/>
 }}
 {{Starbox catalog
@@ Line 35: / Line 46: @@
 {{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}} 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 five times more distant.  It has the spectral type A8/F0 III.<ref name=grenier/>
+'''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 an [[effective temperature|surface temperature]] of {{val|7,167|fmt=commas|ul=K}}.  It has exhausted its core hydrogen and evolved away from the [[main sequence]].
+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 ==
 {{Reflist|refs=
-<ref name=dr2>{{cite DR2|1563586799775391104}}</ref>
+<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}}</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>
@@ Line 52: / Line 66: @@
 ==External links==
 * [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]
 {{Stars of Ursa Major}}
-[[Category:Ursa Major (constellation)]]
+[[Category:Ursa Major]]
 [[Category:Henry Draper Catalogue objects|116798]]
 [[Category:A-type giants]]
 [[Category:F-type giants]]
 [[Category:Durchmusterung objects|BD+55 1602]]
-[[Category:2MASS objects]]
+[[Category:2MASS objects|J13245185+5453509]]
 [[Category:Stars with proper names]]

Observation data Epoch J2000.0 Equinox J2000.0
Location of Sidus Ludoviciana (circled)
Constellation	Ursa Major
Right ascension	13^h 24^m 51.8521^s^[1]
Declination	+54° 53′ 50.841″^[1]
Apparent magnitude (V)	+7.58^[2]
Characteristics
Spectral type	A5-F0^[3]^[4]
Astrometry

Radial velocity (R_v)	−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]
Distance	297.5 ± 0.8 ly (91.2 ± 0.2 pc)

Details

Mass	1.5^[1] `M`_☉
Radius	1.6^[1] `R`_☉
Luminosity	6.2^[1] `L`_☉
Surface gravity (log g)	4.13^[1] cgs
Temperature	7,223^[1] K
Age	961^[1] Myr

Other designations
Sidus Ludoviciana, HD 116798, SAO 28748, BD+55°1602, GC 18150, TYC 3850-257-1, 2MASS J13245185+5453509
Database references
SIMBAD	data