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{{Infobox planet
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|minorplanet=yes
|name=(31345) 1998 PG
|image=[[File:Orbit of 31345.gif|300px|Orbit of 31345]]
|bgcolour=#FFFFC0
|discovery=yes
|discoverer=[[LONEOS]]
|discovered=19 August 1998
|orbit_ref=<ref name = "JPL SBDB">{{cite sbdb|title=(31345) 1998 PG|id=2031345|orbit=yes}}</ref>
|aphelion={{convert|419.50|Gm|AU|4|abbr=on|disp=flip}}
|perihelion={{convert|183.43|Gm|AU|4|abbr=on|disp=flip}}
|semimajor=2.0152 AU
|eccentricity=0.3915
|period=2.86 [[Julian year (astronomy)|yr]]
|inclination=6.4941°
|asc_node=222.8°
|arg_peri=155.97°
|mean_anomaly=93.233°
|satellites=1
|p_mean_motion=0.3445
|physical_characteristics=yes
|single_temperature=188 K (-85°C)
|abs_magnitude= 17.3<ref name = "Johnston archive">
{{cite web
|last=Johnston |first=W. R.
|date=1 September 2005
|title=(31345) 1998 PG
|url=http://www.johnstonsarchive.net/astro/astmoons/am-31345.html
|work=Johnston's Archive
|accessdate=2013-09-20
}}</ref>
|rotation=2.5162 h<ref name = "JPL SBDB" /><ref>
{{cite journal
|last1=Pravec |first1=P.
|last2=Šarounová |first2=L.
|last3=Rabinowitz |first3=D. L.
|last4=Hicks |first4=M. D.
|last5=Wolf |first5=M.
|last6=Krugly |first6=Y. N.
|last7=Velichko |first7=F. P.
|last8=Shevchenko |first8=V. G.
|last9=Chiorny |first9=V. G.
|last10=Gaftonyuk |first10=N. M.
|last11=Genevier |first11=G.
|display-authors=1
|year=2000
|title=Two-Period Lightcurves of 1996 FG<sub>3</sub>, 1998 PG, and (5407) 1992 AX: One Probable and Two Possible Binary Asteroids
|journal=[[Icarus (journal)|Icarus]]
|volume=146 |issue=1 |pages=190–200
|bibcode=2000Icar..146..190P
|doi=10.1006/icar.2000.6375
}}</ref>
|dimensions={{convinfobox|900|m||ft}}<ref name = "Johnston archive" />
|albedo=0.16<ref name = "Johnston archive" />
|spectral_type=[[Q-type asteroid|Q]]
}}
'''(31345) 1998 PG''' is a [[near-earth object]] discovered by the [[LONEOS]] program on August 3, 1998. It is known to have a [[Asteroid moon|moon]], S/2001 (31345) 1.<ref>
{{cite web
|last=Lance |first=B.
|date=6 August 2013
|url=http://echo.jpl.nasa.gov/~lance/binary.neas.html
|title=Binary and Ternary Near-Earth Asteroids Detected by Radar
|publisher=[[JPL]]/[[NASA]]
|accessdate=2013-09-20
}}</ref>
 
== Status as a Near-Earth Object ==
1998 PG is classified as an [[Amor asteroid]]. It has made multiple close approaches to [[Earth]], with the closest being {{convert|35,648,680|km}} on 15 October 1978.<ref name = "JPL SBDB" />
 
== Moon ==
[[File:Table Mountain Observatory 2.jpg|thumb|left|[[Table Mountain Observatory]], where S/2001 (31345) 1 was discovered.]]
[[File:Asteroids and their Moons Comparison.png|thumb|500 px|The 1998 PG system compared to other binary asteroids.]]
1998 PG has a single [[Natural satellite|moon]], S/2001 (31345) 1. The moon was discovered at the [[Table Mountain Observatory]] by analyzing observations from 29 August to 25 October 1998. S/2001 (31345) 1 has a size of {{convert|300|m}}, one-third the size of the asteroid itself, and orbits every 14 hours with a semi-major axis of {{convert|1.5|km}}.<ref name = "Johnston archive" /> From the surface of 1998 PG, the moon would have an angular diameter of about 16.3°.<ref group="lower-alpha">Calculated by solving <math> \scriptstyle{\mathrm{tan}\left(\frac{\theta}{2}\right) = \frac{\mathrm{radius~of~moon}}{\mathrm{distance~from~surface~of~asteroid~to~center~of~moon}}}</math>.</ref> For comparison, the [[Sun]] appears to be 0.5° from Earth.
 
{{clear|left}}
 
== Notes ==
{{notelist}}
 
== References ==
{{Reflist}}
 
==Further reading==
*{{cite journal
|last1=Kiss |first1=L. L.
|last2=Szabó |first2=Gy.
|last3=Sárneczky |first3=K.
|year=1999
|title=CCD photometry and new models of 5 minor planets
|journal=[[Astronomy and Astrophysics Supplement Series]]
|volume=140 |issue= |pages=21–28
|arxiv=astro-ph/9909159
|bibcode=1999A&AS..140...21K
|doi=10.1051/aas:1999115
}}
 
{{DEFAULTSORT:31345}}
[[Category:Amor asteroids]]
[[Category:Astronomical objects discovered in 1998]]
[[Category:Near-Earth asteroids]]
[[Category:Asteroids]]
[[Category:Binary asteroids]]
 
{{Minor planets navigator|(31344) 1998 OM12|(31346) 1998 PB1}}

Latest revision as of 10:59, 27 May 2014

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