Eta Crucis
Template:Location mark Location of Mimosa (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Crux |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 4.14[2] |
| Characteristics | |
| Spectral type | F2 V[3] |
| U−B Template:Engvar | +0.00[2] |
| B−V Template:Engvar | +0.35[2] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[1] km/s |
| Proper motion (μ) | RA: +34.270 mas/yr[1] Dec.: Script error: No such module "val". mas/yr[1] |
| Parallax (π) | 50.7919±0.1049 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 2.67[4] |
| Details[1] | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val". cgs |
| Temperature | 6,830[5] K |
| Metallicity [Fe/H] | −0.04[3] dex |
| Rotational velocity (v sin i) | Script error: No such module "val".[4] km/s |
| Age | Script error: No such module "val". Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| η Cru, CD−63°2145, GJ 455.2, GJ 9388, HD 105211, HIP 59072, HR 4616, SAO 251742[6] | |
| Database references | |
| SIMBAD | data |
Script error: No such module "Check for unknown parameters".Eta Crucis (η Crucis) is a solitary[7] star in the southern constellation of Crux. It can be seen with the naked eye, having an apparent visual magnitude of 4.14m.[2] Based upon parallax measurements,[1] η Crucis is located at a distance of 64 light-years. The system made its closest approach about 1.6 million years ago when it achieved perihelion at a distance of roughly 26 light years.[8]
This is an F-type main sequence star with a stellar classification of F2 V.[3] It has 151% of the Sun's mass, 185% of the Sun's radius and shines with 6.9 times the luminosity of the Sun from its outer atmosphere[1] with an effective temperature of 6,830 K.[5]
Eta Crucis has a pair of visual companions. Component B is a magnitude 11.80 star located at an angular separation of 48.30″ along a position angle of 300°, as of 2010. Component C has a magnitude of 12.16 and lies at an angular separation of 35.50″ along a position angle of 194°, as of 2000.[9]
Debris disk
Template:CSS image cropA debris disk around Eta Crucis was initially inferred from observations from the Spitzer Space Telescope that showed a significant infrared excess at a wavelength of 70 μm, which was atribuited to the presence of a circumstellar disk.[10] A further analysis of the IR excess show that the circumstellar disk around Eta Crucis is divided in a warm dust disk and a cold debris disk.[11]
The warm disk is positioned at Script error: No such module "val". (AU) from Eta Crucis and has a temperature of Script error: No such module "convert".. The grains that make this dust disk are milimiter-sized. It is believed this disk (and its particles) originated from both in-situ collisions of planetesimals in a region similar to the Solar System's asteroid belt and from comet delivery, where more distant planetesimals were transported to the inner region by gravitational interactions with other planets. Comet delivery could also suggest the presence of planets formed by comet interactions.[11]
The cold disk is characterized by a narrow ring that is Script error: No such module "val". wide, with an average distance of Script error: No such module "val". and an inner edge of Script error: No such module "val".. Its temperature is estimated at Script error: No such module "convert".. Observations suggest the particles making up it are of large-size.[11] An image of the cold disk was presented in 2025 as part of the REsolved ALMA and SMA Observations of Nearby Stars (REASONS) survey.[12]
Template:OrbitboxPlanet begin Template:OrbitboxPlanet disk Template:OrbitboxPlanet disk
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References
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- ↑ a b c d e f g h Template:Cite Gaia DR3 Gaia DR3 record for this source at VizieR.
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- ↑ Template:Cite simbad
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External links
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