| 词条 | 2013 ND15 |
| 释义 |
| minorplanet = yes | background = #FFC2E0 | name = {{mp|2013 ND|15}} | image = | caption = | discoverer = Pan-STARRS | discovered = July 13, 2013 | mpc_name = {{mp|2013 ND|15}} | alt_names = | mp_category = Aten asteroid [2] Mercury crosser Venus crosser Earth crosser | orbit_ref = [2][4][5] | epoch = 13 January 2016 (JD 2457400.5) | aphelion = {{Convert|1.1660|AU|Gm|abbr=on|lk=on}} | perihelion = {{Convert|0.28100|AU|Gm|abbr=on}} | semimajor = {{Convert|0.72351|AU|Gm|abbr=on}} | eccentricity = 0.61162 | period = 0.62 yr (224.8 d) | inclination = 4.7962° | asc_node = 95.841° | arg_peri = 19.697° | mean_anomaly = 198.82° | dimensions = 40–100 m{{ref label|A|a|none}}[6] | mass = | density = | rotation = | albedo = | single_temperature = | spectral_type = | abs_magnitude = 24.1[2] | mean_motion = 1.6015°/day | uncertainty = 7 | moid = {{Convert|0.00751978|AU|km|abbr=on}} | jupiter_moid = {{Convert|3.95146|AU|Gm|abbr=on}} }}{{mp|2013 ND|15}} (also written 2013 ND15) is an asteroid that is a temporary trojan of Venus, the first known Venus trojan.[8] Discovery, orbit and physical properties{{mp|2013 ND|15}} was discovered on July 13, 2013 by N. Primak, A. Schultz, T. Goggia and K. Chambers observing for the Pan-STARRS project. As of September 2014, it has been observed 21 times with a data-arc span of 26 days. It is an Aten asteroid and its semi-major axis (0.7235 AU) is very similar to that of Venus but it has high eccentricity (0.6115) and small orbital inclination (4.794°). With an absolute magnitude of 24.1, it has a diameter in the range 40–100 m (for an assumed albedo range of 0.04-0.20).Trojan dynamical state and orbital evolution{{mp|2013 ND|15}} has been identified as a Venus trojan following a tadpole orbit around Venus' Lagrangian point {{L4|pt=no}}.[8] Besides being a Venus co-orbital, this asteroid is also a Mercury crosser and an Earth crosser. {{mp|2013 ND|15}} exhibits resonant (or near-resonant) behavior with Mercury, Venus and Earth.[8] Its short-term dynamical evolution is different from that of the other three Venus co-orbitals, {{mpl|2001 CK|32}}, {{mpl|2002 VE|68}}, and {{mpl|2012 XE|133}}.[8]Potentially hazardous asteroid{{mp|2013 ND|15}} is not included in the Minor Planet Center list of potentially hazardous asteroids (PHAs) because its absolute magnitude is greater than 22.0, even though it comes to within 0.05 AU of Earth periodically. It approached Earth at 0.077 AU on June 21, 2016.See also
Notes{{refbegin}}
References1. ^1 2 3 {{Cite SBDB|title=2013 ND15|id=3645042|access-date=3 April 2016}} [1][2][3][4][5]2. ^1 AstDys-2 on 2013 ND15 Retrieved 2014-01-21 3. ^1 NEODyS-2 on 2013 ND15 Retrieved 2014-01-21 4. ^1 Absolute-magnitude conversion table (H) 5. ^1 2 3 4 {{Cite journal |title=Asteroid 2013 ND15: Trojan companion to Venus, PHA to the Earth |first1=C. | last1=de la Fuente Marcos |last2=de la Fuente Marcos|first2= R. |date= |journal=Monthly Notices of the Royal Astronomical Society |volume = 439 |issue = 3 |pages = 2970–2977 |doi = 10.1093/mnras/stu152 |url=http://mnras.oxfordjournals.org/content/early/2014/02/15/mnras.stu152.abstract |arxiv=1401.5013 |bibcode = 2014MNRAS.439.2970D}} }}
External links
7 : Aten asteroids|Venus trojans|Minor planet object articles (unnumbered)|Venus-crosser asteroids|Earth-crosser asteroids|Co-orbital minor planets|Astronomical objects discovered in 2013 |
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