2017 DR109

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2017 DR109
Discovery [1]
Discovered byCatalina Sky Srvy.
Discovery siteMount Lemmon Obs.
Discovery date27 February 2017
MPC designation2017 DR109
NEO · Apollo[1] · Aten[2]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 6
Observation arc(5 days)
Aphelion1.2422 AU
Perihelion0.7591 AU
1.0006 AU
1.00 yr (366 days)
0° 59m 4.92s / day
Earth MOID0.0062 AU (2.4 LD)
Physical characteristics
Mean diameter
9–20 m (estimate)[3][4][a]

2017 DR109, is a micro-asteroid, classified as near-Earth object of the Apollo group and Aten group, respectively. It is currently trapped in a 1:1 mean motion resonance with the Earth of the horseshoe type.[5] The object was first observed on 27 February 2017, by astronomers of the Catalina Sky Survey conducted at Mount Lemmon Observatory, Arizona, United States.[2]


2017 DR109 was first observed by astronomer D. C. Fuls on 27 February 2017, using the 0.68-meter Schmidt camera of the Catalina Sky Survey at a visual apparent magnitude of 19.6.[5]:6

Orbit and physical properties[edit]

The asteroid's orbit has still a high uncertainty; with a very short observation arc of just 5 days. It orbits the Sun at a distance of 0.76–1.24 AU once every 366 days (semi-major axis of 1.00 AU). Its orbit has an eccentricity of 0.24 and an inclination of 3° with respect to the ecliptic.[1] With a semi-major axis of that of Earth, the object is both classified as a member of Apollo and Aten in the JPL Small-Body Database and by the Minor Planet Center, respectively.[1][2] Both Apollo and Aten asteroids are Earth-crossing asteroids.

Earth co-orbital[edit]

2017 DR109 is currently trapped in a 1:1 mean motion resonance with the Earth of the horseshoe type and follows an orbit similar to those of 54509 YORP, 2017 FZ2 and several other near-Earth asteroids.[5]

Physical characteristics[edit]

2017 DR109 has an absolute magnitude of 27.6 which gives a calculated mean diameter between 9 and 20 meters for an assumed geometric albedo of 0.20 and 0.04, respectively, which are typical values for stony S-type and carbonaceous C-type asteroids.[3][4]


  • ^ This is assuming an albedo of 0.20 and 0.04, respectively.


  1. ^ a b c d e f "JPL Small-Body Database Browser: (2017 DR109)" (2017-03-04 last obs.). Jet Propulsion Laboratory. Retrieved 8 February 2018.
  2. ^ a b c "2017 DR109". Minor Planet Center. Retrieved 8 February 2018.
  3. ^ a b "2017 DR109 – Summary". NEODyS-2, Near Earth Objects – Dynamic Site. Retrieved 8 February 2018.
  4. ^ a b "Asteroid Size Estimator". CNEOS NASA/JPL. Retrieved 8 February 2018.
  5. ^ a b c de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (January 2018). "Asteroid 2017 FZ2 et al.: signs of recent mass-shedding from YORP?" (PDF). Monthly Notices of the Royal Astronomical Society. 473 (3): 3434–3453. arXiv:1709.09379. Bibcode:2018MNRAS.473.3434D. doi:10.1093/mnras/stx2540. Retrieved 8 February 2018.

External links[edit]