1999 TR11, is a resonant trans-Neptunian object from the Kuiper belt, located in the outermost region of the Solar System. The reddish plutino measures approximately 93 kilometers (58 miles) in diameter. It was first observed on 9 October 1999, by American astronomer Scott Sheppard at the Mauna Kea Observatories with the University of Hawaii's 2.2-meter telescope.[1][2]
| Discovery[1][2] | |
|---|---|
| Discovered by | S. S. Sheppard[3] |
| Discovery site | Mauna Kea Obs. |
| Discovery date | 9 October 1999 (first observed only) |
| Designations | |
| 1999 TR11 | |
| TNO[4] · plutino[5] distant[1] | |
| Orbital characteristics[4] | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 6 | |
| Observation arc | 1.23 yr (448 d) |
| Aphelion | 48.670 AU |
| Perihelion | 29.697 AU |
| 39.184 AU | |
| Eccentricity | 0.2421 |
| 245.28 yr (89,589 d) | |
| 36.718° | |
| 0° 0m 14.4s / day | |
| Inclination | 17.163° |
| 54.786° | |
| 346.17° | |
| Physical characteristics | |
Mean diameter | 93 km (est.)[5] |
| 0.09 (assumed)[5] | |
| RR (very red)[5] B–V = 1.020[6] V–R = 0.750[6] | |
| 8.4[1][4] 8.63[6] | |
Orbit and classification edit
1999 TR11 orbits the Sun at a distance of 29.7–48.7 AU once every 245 years and 3 months (89,589 days; semi-major axis of 39.18 AU). Its orbit has an eccentricity of 0.24 and an inclination of 17° with respect to the ecliptic.[4] The body's observation arc begins with a precovery taken at Mauna Kea on 7 October 1999, just two nights prior to its official first observation.[1]
It is a member of the plutinos, a group of resonant trans-Neptunian objects named after Pluto. Located in the inner region of Kuiper belt, the plutinos are making 2 orbits for every 3 Neptune makes.
Numbering and naming edit
As of 2018, this minor planet has neither been numbered nor named by the Minor Planet Center. The official discoverer(s) will be defined when the object is numbered.[1]
Physical characteristics edit
1999 TR11 has a very reddish color (RR), indicative of a non-carbonaceous composition rich in tholins and methane.[5] According to the Johnston's archive, the object only measures 93 kilometers in diameter based on an absolute magnitude of 8.4, and an assumed albedo of 0.09 for the body's surface.[5] Since it is far too small for being considered a dwarf planet candidate, it is not listed at Michael Brown's website.[7] As of 2018, no rotational lightcurve of 1999 TR11 has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.[4][8]
References edit
- ^ a b c d e f "1999 TR11". Minor Planet Center. Retrieved 23 October 2018.
- ^ a b Sheppard, S.; Marsden, B. G. (October 1999). "1999 TR11". Minor Planet Electronic Circ. (1999-T51 (1999). (MPEC Homepage)). Bibcode:1999MPEC....T...51S. Retrieved 23 October 2018.
- ^ "List Of Transneptunian Objects". Minor Planet Center. Retrieved 23 October 2018.
- ^ a b c d e "JPL Small-Body Database Browser: (1999 TR11)" (2000-12-28 last obs.). Jet Propulsion Laboratory. Retrieved 23 October 2018.
- ^ a b c d e f "List of Known Trans-Neptunian Objects". Johnston's Archive. 7 October 2018. Retrieved 23 October 2018.
- ^ a b c "Asteroid 1999 TR11". Small Bodies Data Ferret. Retrieved 23 October 2018.
- ^ Brown, Michael E. "How many dwarf planets are there in the outer solar system?". California Institute of Technology. Retrieved 23 October 2018.
- ^ "LCDB Data for (1999+TR11)". Asteroid Lightcurve Database (LCDB). Retrieved 23 October 2018.
External links edit
- 1999 TR11, Sheppard, S., Marsden, B. G. 1999, Minor Planet Electronic Circular, 1999-T51
- List of Transneptunian Objects, Minor Planet Center
- 1999 TR11 at AstDyS-2, Asteroids—Dynamic Site
- 1999 TR11 at the JPL Small-Body Database