49 Ceti

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

{{Starbox begin}}

{{Starbox image

| image=

{{Location mark

|image=Cetus constellation map.svg|alt=|float=center|width=300

|label=|position=right

|mark=Red circle.svg|mark_width=8|mark_link=49 Cet

|x=532|y=562

}}

| caption = Location of 49 Ceti (circled)

}}

{{Starbox observe

| epoch = J2000

| constell = Cetus

| ra = {{RA|01|34|37.77883}}{{Cite Gaia DR2|2451838022871837312}}

| dec = {{DEC|-15|40|34.8981}}

| appmag_v = 5.607{{cite journal|title=The Tycho-2 catalogue of the 2.5 million brightest stars|author=Høg, E.|display-authors=etal|date=2000|journal=Astronomy and Astrophysics|volume=355|pages=L27–L30|bibcode=2000A&A...355L..27H}}

}}

{{Starbox character

| type =

| class = A1V{{cite journal |bibcode=2013ApJ...771...69R |doi=10.1088/0004-637X/771/1/69 |arxiv=1305.2894 |title=Herschel Observations of Gas and Dust in the Unusual 49 Ceti Debris Disk |journal=The Astrophysical Journal |volume=771 |pages=69 |year=2013 |last1=Roberge |first1=A. |last2=Kamp |first2=I. |last3=Montesinos |first3=B. |last4=Dent |first4=W. R. F. |last5=Meeus |first5=G. |last6=Donaldson |first6=J. K. |last7=Olofsson |first7=J. |last8=Moór |first8=A. |last9=Augereau |first9=J.-C. |last10=Howard |first10=C. |last11=Eiroa |first11=C. |last12=Thi |first12=W.-F. |last13=Ardila |first13=D. R. |last14=Sandell |first14=G. |last15=Woitk e|first15=P. |issue=1 |s2cid=1630036 }}

| b-v = +0.07{{cite journal|last1=Rybka|first1=E.|title=The corrected magnitudes and colours of 278 stars near S.A. 1-139 in the UBV system|journal=Acta Astronomica|volume=19|page=229|year=1969|bibcode=1969AcA....19..229R}}

| u-b = +0.05

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|+10.30|0.7}}{{cite journal|title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system|author=Gontcharov, G. A.|date=2006|journal=Astronomy Letters|volume=32|issue=11|pages=759–771|bibcode=2006AstL...32..759G|doi=10.1134/S1063773706110065|arxiv=1606.08053|s2cid=119231169}}

| prop_mo_ra = 94.207

| prop_mo_dec = -3.165

| parallax = 17.5234

| p_error = 0.1001

| parallax_footnote=

| absmag_v =

}}

{{Starbox detail

| source = {{cite journal|bibcode=2012A&A...537A.120Z|arxiv=1201.2052|title=Rotational velocities of A-type stars. IV. Evolution of rotational velocities|journal=Astronomy & Astrophysics|volume=537|pages=A120|last1=Zorec|first1=J.|last2=Royer|first2=F.|year=2012|doi=10.1051/0004-6361/201117691|s2cid=55586789}}

| mass = 2.02

| radius =

| luminosity = 19.12

| temperature = 8,790

| gravity = 4.30

| metal_fe = 0.10

| rotational_velocity=196

| age_myr = 40

}}

{{Starbox catalog

| names = {{odlist | BD=-16°265 | HD=9672 | HIP=7345 | HR=451 | SAO=147886 }}

}}

{{Starbox reference

| Simbad = 49+Cet

}}

{{Starbox end}}

49 Ceti is a single star in the equatorial constellation of Cetus. It is visible to the naked eye as a dim, white-hued star with an apparent visual magnitude of 5.607. The star is located {{Convert|186|ly|pc|abbr=off}} away from the Solar System, based on its parallax, and is drifting further away with a radial velocity of +10 km/s. 49 Ceti has been identified as a member of the 40-million-year-old Argus Association.

This is a young A-type main-sequence star with a stellar classification of A1V. It is about 40 million years old with a high rate of spin, showing a projected rotational velocity of 196 km/s. The star has double the mass of the Sun. It is radiating 19 times the Sun's luminosity from its photosphere at an effective temperature of 8,790 K.

49 Ceti displays a significant infrared excess, which is a characteristic of a debris disk orbiting the star. Unusually, the disk seems to be gas-rich, with evidence of carbon monoxide (CO) gas. This carbon monoxide gas may possibly be from comets orbiting the star within the disk, similar to the Kuiper Belt in the Solar System.{{cite journal|bibcode=2012ApJ...758...77Z|doi=10.1088/0004-637X/758/2/77|arxiv=1207.1747|title=A 40 Myr Old Gaseous Circumstellar Disk at 49 Ceti: Massive CO-Rich Comet Clouds at Young A-Type Stars|journal=The Astrophysical Journal|volume=758|issue=2|pages=77|year=2012|last1=Zuckerman|first1=B.|last2=Song|first2=Inseok|s2cid=119198485}}