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| {{Infobox planet
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| |minorplanet=yes
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| |name=(31345) 1998 PG
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| |image=[[File:Orbit of 31345.gif|300px|Orbit of 31345]]
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| |bgcolour=#FFFFC0
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| |discovery=yes
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| |discoverer=[[LONEOS]]
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| |discovered=19 August 1998
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| |orbit_ref=<ref name = "JPL SBDB">{{cite sbdb|title=(31345) 1998 PG|id=2031345|orbit=yes}}</ref>
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| |aphelion={{convert|419.50|Gm|AU|4|abbr=on|disp=flip}}
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| |perihelion={{convert|183.43|Gm|AU|4|abbr=on|disp=flip}}
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| |semimajor=2.0152 AU
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| |eccentricity=0.3915
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| |period=2.86 [[Julian year (astronomy)|yr]]
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| |inclination=6.4941°
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| |asc_node=222.8°
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| |arg_peri=155.97°
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| |mean_anomaly=93.233°
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| |satellites=1
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| |p_mean_motion=0.3445
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| |physical_characteristics=yes
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| |single_temperature=188 K (-85°C)
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| |abs_magnitude= 17.3<ref name = "Johnston archive">
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| {{cite web
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| |last=Johnston |first=W. R.
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| |date=1 September 2005
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| |title=(31345) 1998 PG
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| |url=http://www.johnstonsarchive.net/astro/astmoons/am-31345.html
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| |work=Johnston's Archive
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| |accessdate=2013-09-20
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| }}</ref>
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| |rotation=2.5162 h<ref name = "JPL SBDB" /><ref>
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| {{cite journal
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| |last1=Pravec |first1=P.
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| |last2=Šarounová |first2=L.
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| |last3=Rabinowitz |first3=D. L.
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| |last4=Hicks |first4=M. D.
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| |last5=Wolf |first5=M.
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| |last6=Krugly |first6=Y. N.
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| |last7=Velichko |first7=F. P.
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| |last8=Shevchenko |first8=V. G.
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| |last9=Chiorny |first9=V. G.
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| |last10=Gaftonyuk |first10=N. M.
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| |last11=Genevier |first11=G.
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| |display-authors=1
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| |year=2000
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| |title=Two-Period Lightcurves of 1996 FG<sub>3</sub>, 1998 PG, and (5407) 1992 AX: One Probable and Two Possible Binary Asteroids
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| |journal=[[Icarus (journal)|Icarus]]
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| |volume=146 |issue=1 |pages=190–200
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| |bibcode=2000Icar..146..190P
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| |doi=10.1006/icar.2000.6375
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| }}</ref>
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| |dimensions={{convinfobox|900|m||ft}}<ref name = "Johnston archive" />
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| |albedo=0.16<ref name = "Johnston archive" />
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| |spectral_type=[[Q-type asteroid|Q]]
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| }}
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| '''(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>
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| {{cite web
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| |last=Lance |first=B.
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| |date=6 August 2013
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| |url=http://echo.jpl.nasa.gov/~lance/binary.neas.html
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| |title=Binary and Ternary Near-Earth Asteroids Detected by Radar
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| |publisher=[[JPL]]/[[NASA]]
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| |accessdate=2013-09-20
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| }}</ref>
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| == Status as a Near-Earth Object ==
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| 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" />
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| == Moon ==
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| [[File:Table Mountain Observatory 2.jpg|thumb|left|[[Table Mountain Observatory]], where S/2001 (31345) 1 was discovered.]]
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| [[File:Asteroids and their Moons Comparison.png|thumb|500 px|The 1998 PG system compared to other binary asteroids.]]
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| 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.
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| {{clear|left}}
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| == Notes ==
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| {{notelist}}
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| == References ==
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| {{Reflist}}
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| ==Further reading==
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| *{{cite journal
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| |last1=Kiss |first1=L. L.
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| |last2=Szabó |first2=Gy.
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| |last3=Sárneczky |first3=K.
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| |year=1999
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| |title=CCD photometry and new models of 5 minor planets
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| |journal=[[Astronomy and Astrophysics Supplement Series]]
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| |volume=140 |issue= |pages=21–28
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| |arxiv=astro-ph/9909159
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| |bibcode=1999A&AS..140...21K
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| |doi=10.1051/aas:1999115
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| }}
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| {{DEFAULTSORT:31345}}
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| [[Category:Amor asteroids]]
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| [[Category:Astronomical objects discovered in 1998]]
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| [[Category:Near-Earth asteroids]]
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| [[Category:Asteroids]]
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| [[Category:Binary asteroids]]
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| {{Minor planets navigator|(31344) 1998 OM12|(31346) 1998 PB1}}
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27 yr old Vocational Education Teacher Flitter from Balmertown, enjoys to spend time making, boom beach hack and drawing. Is a travel enthusiast and recently made a journey to The Four Lifts on the Canal du Centre.
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