| 词条 | 2017 FZ2 |
| 释义 |
| minorplanet = yes | background = #FFC2E0 | name = {{mp|2017 FZ|2}} | image = | caption = | discoverer = Mt. Lemmon Survey G. J. Leonard {{small|(unofficial credits)}} | discovery_site = Mount Lemmon Obs. | discovered = March 19, 2017 | mpc_name = {{mp|2017 FZ|2}} | alt_names = | mp_category = NEO{{·}}Apollo[1][2] Earth crosser | orbit_ref = [2][4][5] | epoch = 4 September 2017 (JD 2458000.5) | aphelion = {{Convert|1.2730773|AU|Gm|abbr=on|lk=on}} | perihelion = {{Convert|0.741200|AU|Gm|abbr=on}} | semimajor = {{Convert|1.0071385|AU|Gm|abbr=on}} | eccentricity = 0.264054 | period = 1.01 yr (369.1749 d) | inclination = 1.81167° | asc_node = 185.86918° | arg_peri = 100.32304° | mean_anomaly = 87.30597° | dimensions = 13–30 m{{ref label|A|a|none}}[6] | mass = | density = | rotation = | albedo = | spectral_type = | abs_magnitude = 26.7[2] | mean_motion = {{Deg2DMS|0.9751475|sup=ms}} /day | observation_arc = 8 days | uncertainty = 3 | moid = 0.0014 AU{{·}}0.5 LD }}{{mp|2017 FZ|2}} (also written 2017 FZ2) is a micro-asteroid and near-Earth object of the Apollo group that was a quasi-satellite of the Earth until March 23, 2017.[8] Discovery, orbit and physical properties{{mp|2017 FZ|2}} was discovered by American astronomer Gregory Leonard on March 19, 2017 observing for the Mt. Lemmon Survey from Mount Lemmon Observatory.[1] Its orbit is moderately eccentric (0.26), low inclination (1.81º) and a semi-major axis of 1.007 AU. Upon discovery, it was classified as an Apollo asteroid but also an Earth crosser by the Minor Planet Center. Its orbit is very chaotic but it is relatively well determined; as of September 26, 2017 its orbit is based on 52 observations (1 Doppler) spanning a data-arc of 8 days.[2] {{mp|2017 FZ|2}} has an absolute magnitude of 26.7 which gives a characteristic diameter of 20 m.[6]Quasi-satellite{{mp|2017 FZ|2}} was until very recently an Earth’s coorbital, the sixth known quasi-satellite of our planet and thesmallest by far. Its most recent quasi-satellite episode may have started over 225 yr ago and certainly ended after a close encounter with the Earth on 2017 March 23.[8] YORP group?A number of other near-Earth asteroids move in orbits similar to that of {{mp|2017 FZ|2}}, one of the largest being 54509 YORP. There is an apparent excess of small bodies moving in orbits similar to that of YORP and this could be the result of mass shedding from YORP.[8] Notes{{refbegin}}
See also
References1. ^Discovery MPEC [2][3][4][5][6][7]2. ^1 2 3 4 {{Cite SBDB|title=2017 FZ2|id=3771633|access-date=26 September 2017}}(last obs: 2017-03-27) 3. ^1 2 {{cite web |url=http://neo.jpl.nasa.gov/glossary/h.html |title= Absolute-magnitude conversion table (H) |work=NASA |date=26 September 2017}} 4. ^1 {{cite web |url=http://newton.dm.unipi.it/neodys2/index.php?pc=1.1.0&n=2017+FZ2 |work=NEODyS-2, Near Earth Objects – Dynamic Site |title=2017 FZ2 – Summary |access-date=26 September 2017}} 5. ^1 {{cite web |url=http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.0&n=2017+FZ2 |work=AstDys-2, Asteroids – Dynamic Site |title=2017 FZ2 – Summary |access-date=26 September 2017}} 6. ^1 {{cite web |url=http://www.minorplanetcenter.org/iau/lists/Apollos.html |title=List Of Apollo Minor Planets |work=Minor Planet Center |access-date=26 September 2017}} 7. ^1 2 3 {{cite journal |last1=de la Fuente Marcos |first1=Carlos |last2=de la Fuente Marcos |first2=Raúl |title=Asteroid 2017 FZ2 et al.: signs of recent mass-shedding from YORP? |journal=Monthly Notices of the Royal Astronomical Society |date=21 January 2018 |volume=473 |issue=3 |arxiv=1709.09379 |doi=10.1093/mnras/stx2540 |pages=3434-3453 |url=https://academic.oup.com/mnras/article-abstract/473/3/3434/4265370 |bibcode = 2018MNRAS.473.3434D }} }} External links
4 : Apollo asteroids|Minor planet object articles (unnumbered)|Earth-crosser asteroids|Astronomical objects discovered in 2017 |
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