astro.wikisort.org - Asteroid

2015 DR₂₁₅ is a stony near-Earth asteroid of the Atira class residing within Earth's orbit. It was discovered on 18 February 2015 by the Pan-STARRS 1 survey at Haleakalā Observatory at Maui, Hawaiʻi.[1][2] The asteroid has a diameter of about 200 m (660 ft)[4] and makes close approaches within 0.05 AU (7.5 million km; 4.6 million mi) of Earth, making it a potentially hazardous object.[3] On 11 March 2022, it made a close approach 0.045 AU (6.7 million km; 4.2 million mi) from Earth,[3] reaching a peak apparent magnitude of 17 as it streaked across the southern sky.[1]

2015 DR₂₁₅

Discovery[1][2]
Discovered by	Pan-STARRS 1
Discovery site	Haleakalā Obs.
Discovery date	18 February 2015
Designations
MPC designation	2015 DR215
Minor planet category	NEO · Atira · PHA[3][1]
Orbital characteristics[3]
Epoch 21 January 2022 (JD 2459600.5)
Uncertainty parameter 0
Observation arc	7.12 yr (2,602 days)
Aphelion	0.9809 AU
Perihelion	0.3522 AU
Semi-major axis	0.6665 AU
Eccentricity	0.4716
Orbital period (sidereal)	0.54 yr (199 days)
Mean anomaly	74.459°
Mean motion	1° 48m 40.325s / day
Inclination	4.085°
Longitude of ascending node	314.961°
Argument of perihelion	42.298°
Earth MOID	0.044412 AU (6,643,900 km)
Physical characteristics
Mean diameter	205 m[4]
Geometric albedo	0.266[4]
Spectral type	Sr[4]
Absolute magnitude (H)	20.51[3]

Discovery

2015 DR₂₁₅ was discovered on 18 February 2015 by the Pan-STARRS 1 survey at Haleakalā Observatory at Maui, Hawaiʻi.[2] It was first observed at apparent magnitude 20.7, located in the southern sky 28 degrees below the ecliptic with an angular separation (solar elongation) of 76 degrees from the Sun.[2] Follow-up observations from the Mauna Kea Observatory and Cerro Tololo Inter-American Observatory commenced, establishing an observation arc of 12 days until its discovery announcement by the Minor Planet Center on 2 March 2015.[2]

On 5 March 2016, 2015 DR₂₁₅ was recovered by the ESA Optical Ground Station at apparent magnitude 19, at solar elongations below 56 degrees.[5] It was observed to be about 0.5 degrees away from its predicted positions in March 2016.[5] The recovery observations significantly reduced the asteroid's orbital uncertainty, bringing its uncertainty parameter down from 9 to 3.[2][5]

As of 2022^[update], 2015 DR₂₁₅ has been observed for over 7 years, with a well-determined orbit at an uncertainty parameter of 0.[3]

Classification

2015 DR₂₁₅ is one of a small number of Atira class asteroids that are orbiting entirely within the Earth's orbit.[6] The taxonomic class of 2015 DR₂₁₅ in the Bus–DeMeo scheme is Sr, indicating a stony composition.[4]

References

External links

• 2015 DR215 at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
• 2015 DR215 at ESA–space situational awareness
  • Ephemerides · Observations · Orbit · Physical Properties · Summary
• 2015 DR215 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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