| Discovery[1] | |
|---|---|
| Discovered by | T. Kagawa T. Urata |
| Discovery site | Gekko Obs. |
| Discovery date | 8 October 1997 |
| Designations | |
| (9992)1997 TG19 | |
| 1997 TG19 · 1974 HC1 1980 BD | |
| Mars-crosser[1][2] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 42.77 yr (15,622 days) |
| Aphelion | 2.8054AU |
| Perihelion | 1.5370 AU |
| 2.1712 AU | |
| Eccentricity | 0.2921 |
| 3.20yr (1,169 days) | |
| 154.42° | |
| 0° 18m 29.16s / day | |
| Inclination | 2.5944° |
| 42.994° | |
| 234.83° | |
| Physical characteristics | |
| Dimensions | 3.07 km(derived)[2] 4.75±0.36 km[3] |
| 5.7300±0.0016h[4] 5.7402±0.0005 h[5] 5.7408±0.0009 h[a] | |
| 0.137±0.022[3] 0.20(assumed)[2] | |
| S[2] | |
| 14.40[3] · 14.48±0.08(R)[a] · 14.5[1] · 14.663±0.004(R)[4] · 14.76±0.26[6] · 14.97±0.094[2][7] | |
(9992) 1997 TG19 is a stonyasteroid and eccentricMars-crosser, approximately 4 kilometers in diameter. It was discovered on 8 October 1997, by Japanese astronomersTetsuo Kagawa andTakeshi Urata atGekko Observatory near Shizuoka, Japan.[8]
The stonyS-type asteroid orbits the Sun at a distance of 1.5–2.8 AU once every 3 years and 2 months (1,169 days). Its orbit has aneccentricity of 0.29 and aninclination of 3° with respect to theecliptic.[1] The first used observation was made at theCerro El Roble Station in 1974, extending the asteroid'sobservation arc by 23 prior to its discovery.[8]
Between 2006 and 2013, three rotationallightcurves for this asteroid were obtained from photometric observations made at the Hunters Hill Observatory, Australia, theOndřejov Observatory, Czech Republic, and the U.S.Palomar Transient Factory, California. They gave a well-defined, concurringrotation period of5.7402±0.0005 hours (best result) with a brightness amplitude of 0.42, 0.40 and 0.27 inmagnitude, respectively (U=3/3/2).[a][4][5]
According to the survey carried out by the JapaneseAkari satellite, the asteroid's surface has analbedo of 0.13 and a diameter of 4.75 kilometers.[3] TheCollaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 3.1 kilometers, as the higher the body's albedo (reflectivity), the shorter its diameter, at a constant absolute magnitude (brightness).[2]
Thisminor planet wasnumbered by theMinor Planet Center on 2 February 1999.[9] As of 2018, it has not beennamed.[8]
