chi Leonis

{{Short description|Double star system in the constellation Leo}}

{{Starbox begin

| name=χ Leonis

}}

{{Starbox observe

| constell = Leo

| epoch = J2000.0 (ICRS)

| ra = {{RA|11|05|01.02754}}

| dec = {{DEC|+07|20|09.6235}}

| appmag_v = 4.63

}}

{{Starbox character

| class = F2III-IVv

| b-v = +0.33

| u-b = +0.06

| variable =

}}

{{Starbox astrometry

| radial_v = +4.7

| prop_mo_ra = −344.28

| prop_mo_dec = −47.65

| parallax = 34.49

| p_error = 0.20

| parallax_footnote =

| absmag_v = +2.31

}}

{{Starbox detail

| mass = 1.62

| radius = 1.99

| luminosity = 9.9

| temperature = {{Val|7,022|80}}

| metal_fe = +0.03

| gravity = 4.02

| rotational_velocity = {{Val|25|1}}

| age_gyr = 1.40

}}

{{Starbox catalog

| names = χ Leo, 63 Leo, BD+08°2455, FK5 418, HD 96097, HIP 54182, HR 4310, SAO 118648

}}

{{Starbox reference

| Simbad = chi+Leo

}}

Chi Leonis, Latinized from χ Leonis, is a double star in the constellation Leo. It is visible to the naked eye with an apparent visual magnitude of 4.63. The distance to this star, as determined using parallax measurements, is around 95 light years. It has an annual proper motion of 346 mas.

This is most likely a binary star system. The primary component is an evolved, F-type giant star with a stellar classification of F2III-IVv. It has an estimated 162% of the Sun's mass and nearly twice the Sun's radius. The companion is a magnitude 11.0 star at an angular separation of 4.1″ along a position angle of 264°, as of 1990.

Observation

On 18 October 2015, it was occulted by Mars as viewed from East Asia and Japan.{{cite book |date=2002 |first=Jan |last=Meeus |chapter=Mutual occultations of planets |pages=174–185 |title=More Mathematical Astronomy Morsels |isbn=0943396743 |url=https://falakmu.id/khgt/dokumen/More%20mathematical%20astronomy%20morsels%20(Jean%20Meeus)%20(Z-Library).pdf}}{{rp|165}}

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}}

Category:F-type giants

Category:Leo (constellation)