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CL Draconis

{{Short description|Star in the constellation Draco}}

{{Starbox begin

| name = CL Draconis

}}

{{Starbox image

| image =

{{Location mark

| image=Quadrans muralis map.png

| float=center | width=250 | position=right

| mark=Red circle.svg | mark_width=10 | mark_link=CL Dra

| x%=20.5 | y%=33.0

}}

| caption = CL Draconis (circled), with the obsolete constellation Quadrans Muralis in the background.

}}

{{Starbox observe

| epoch = J2000

| constell = Draco

| ra = {{RA|15|57|47.44180}}

| dec = {{DEC|+54|44|59.1428}}

| appmag_v = 4.96

}}

{{Starbox character

| type =

| class = F0 IV

| b-v = {{Val|0.269|0.008}}

| u-b =

| variable = δ Sct

}}

{{Starbox astrometry

| radial_v = {{Val|−11.0|4.2}}

| prop_mo_ra = −151.643

| prop_mo_dec = +107.519

| parallax = 29.9305

| p_error = 0.1368

| parallax_footnote =

| absmag_v = 2.33

}}

{{Starbox detail

| source =

| mass = {{Val|1.68|0.01}}

| radius =

| luminosity = {{Val|10.2|0.2|0.3}}

| gravity = {{Val|4.04|0.14}}

| temperature = {{Val|7439|253|fmt=commas}}

| metal_fe = {{Val|0.04|0.10}}

| rotational_velocity = 165

| age_myr = 643

}}

{{Starbox catalog

| names={{odlist | V=CL Dra | BD=+55° 1793 | FK5=595 | HD=143466 | HIP=78180 | HR=5960 | SAO=29727 | AG=+54° 1023 }}

}}

{{Starbox reference

| Simbad = CL+Dra

}}

{{Starbox end}}

CL Draconis is a single star in the northern circumpolar constellation of Draco. It can be viewed with the naked eye, having an apparent visual magnitude of 4.96. The distance to this star, as determined from its annual parallax shift of {{Val|29.9|ul=mas}}, is 109 light years. It is moving closer to the Earth with a heliocentric radial velocity of −11 km/s. The star has a relatively high proper motion, traversing the celestial sphere at the rate of {{Val|0.185|ul=arcsecond}}/yr.

Based upon a stellar classification of F0 IV, this is an aging F-type subgiant star that has consumed the hydrogen at its core. It is spinning rapidly with a projected rotational velocity of 165 km/s, giving it an oblate shape with an equatorial bulge that is estimated to be 8% larger than the polar radius.

Image:CLDraLightCurve.png

CL Draconis is a Delta Scuti variable, changing brightness with an amplitude of 0.010 magnitude over a period of {{Convert|0.0763|days|hours|abbr=off|disp=out}}. CL Dra has 1.68 times the mass of the Sun and is radiating 10.2 times the Sun's luminosity from its photosphere at an effective temperature of 7,439 K.

It was transferred from Draco to Quadrans Muralis. Later when the International Astronomical Union officially recognised constellations, Quadrans Muralis became obsolete, so this star was moved back to Draco.

References

{{reflist|refs=

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{{cite simbad | title=CL Dra | access-date=3 September 2018 }}

{{cite DR2}}

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| volume=74 | pages=375–406 | date=April 1969

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| journal=The Astrophysical Journal | postscript=.

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{{citation

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| bibcode=2012A&A...537A.120Z | arxiv=1201.2052

| doi=10.1051/0004-6361/201117691 | s2cid=55586789

}}

{{citation

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| arxiv=1208.3048 | s2cid=59451347 | postscript=. }}

{{citation

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| journal=The Astronomy and Astrophysics Review

| volume=20 | issue=1 | page=51 | date=March 2012

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{{citation

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| journal=The Astronomical Journal

| volume=129 | issue=3 | pages=1483–1522 | date=March 2005

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| volume=144 | pages=469–474 | date=June 2000

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}}

{{Stars of Draco}}

{{DEFAULTSORT:CL Draconis}}

Category:F-type subgiants

Category:Delta Scuti variables

Category:Draco (constellation)

Category:Durchmusterung objects

143466

078180

5960

Draconis, CL