astro.wikisort.org - Asteroid

2028 Janequeo, provisional designation 1968 OB₁, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 3 kilometers in diameter. It was discovered on July 18th 1968, by Chilean astronomers Carlos Torres and S. Cofre at the Cerro El Roble Station of Chile's National Astronomical Observatory.[8] The asteroid named after the indigenous heroine Janequeo (Yanequén).[2]

2028 Janequeo

Discovery [1]
Discovered by	C. Torres S. Cofré
Discovery site	Cerro El Roble Stn.
Discovery date	18 July 1968
Designations
MPC designation	(2028) Janequeo
Named after	Janequeo (or Yanequén) (Mapuche heroine)[2]
Alternative designations	1968 OB1
Minor planet category	main-belt · Flora [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	47.89 yr (17,491 days)
Aphelion	2.5550 AU
Perihelion	2.0382 AU
Semi-major axis	2.2966 AU
Eccentricity	0.1125
Orbital period (sidereal)	3.48 yr (1,271 days)
Mean anomaly	70.128°
Mean motion	0° 16m 59.52s / day
Inclination	7.9558°
Longitude of ascending node	242.80°
Argument of perihelion	27.574°
Physical characteristics
Dimensions	2.45 km (calculated)[3] 3.201±0.290 km[4][5]
Synodic rotation period	2.480±0.0002 h[6]
Geometric albedo	0.24 (assumed)[3] 0.273±0.070[4][5]
Spectral type	S [3]
Absolute magnitude (H)	14.5[4] · 14.769±0.004 (R)[6] · 14.79±0.38[7] · 14.8[1] · 15.22[3]

Classification and orbit

Janequeo is a member of the Flora family, one of the largest collisional populations of stony asteroids. It orbits the Sun in the inner main-belt at a distance of 2.0–2.6 AU once every 3 years and 6 months (1,271 days). Its orbit has an eccentricity of 0.11 and an inclination of 8° with respect to the ecliptic.[1] The body's observation arc begins at the discovering observatory one night after its official discovery observation on 19 July 1968.[8]

Physical characteristics

Lightcurves

In August 2010, a rotational lightcurve of Janequeo was obtained from photometric observations by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a short rotation period of 2.480 hours with a brightness amplitude of 0.27 magnitude (U=2).[6]

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Janequeo measures 3.201 kilometers in diameter and its surface has an albedo of 0.273.[4][5] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of the Flora family – and calculates a diameter of 2.45 kilometers based on an absolute magnitude of 15.22.[3]

Naming

This minor planet was named after Janequeo (Yanequén), a heroine and leader of the native Mapuche people of Chile. After her husband Huepotaén died in battle against the colonial Spaniards during the Arauco War in the 16th century, she became tribal chief and brought together various rebellious tribes.[2] The approved naming citation was published by the Minor Planet Center on 1 June 1980 (M.P.C. 5359).[9]

See also

• 1992 Galvarino

References

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 2028 Janequeo at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 2028 Janequeo at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (2028) Janequeo

(2028) Janequeo (1968 OB1) ist ein Asteroid des Hauptgürtels, der am 18. Juli 1968 von Carlos Torres, vom Cerro El Roble-Observatorium aus, entdeckt wurde.

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- [en] 2028 Janequeo

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