{{Short description|Main-belt asteroid}} {{Use dmy dates|date=October 2019}} {{Infobox planet | minorplanet=yes | background=#D6D6D6 | name=249 Ilse | discoverer=C. H. F. Peters |image=000249-asteroid shape model (249) Ilse.png |caption=3D model based on lightcurve data | discovered=16 August 1885 | mpc_name=(249) Ilse | alt_names=A885 QA, 1973 PB | pronounced = {{IPA|de|ˈɪlzə|lang}}<ref>[https://www.germannames.de/wiki/Ilse (German Names)]</ref> | mp_category=Main belt | epoch=31 July 2016 (JD 2457600.5) | semimajor={{Convert|2.37721|AU|Gm|abbr=on}} | perihelion={{Convert|1.85992|AU|Gm|abbr=on}} | aphelion={{Convert|2.89450|AU|Gm|abbr=on|lk=on}} | eccentricity=0.21760 | period=3.67 yr (1338.8 d) | inclination=9.61979° | asc_node=334.727° | arg_peri=42.3241° | mean_anomaly=223.964° | avg_speed=19.31 km/s | dimensions={{val|34.83|1.1|ul=km}} |named_after=Ilse | mass= | density= | rotation={{Convert|84.94|h|d|abbr=on|lk=on}} | spectral_type= | abs_magnitude=11.33 | albedo={{val|0.0428|0.003}} | single_temperature=''unknown'' | mean_motion={{Deg2DMS|0.268907|sup=ms}} / day | orbit_ref=<ref name="jpldata">{{Cite web |url=https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=249;cad=1 |title=249 Ilse |work=JPL Small-Body Database |publisher=NASA/Jet Propulsion Laboratory |access-date=12 May 2016}}</ref> | observation_arc=130.59 yr (47699 d) | uncertainty=0 }}
'''249 Ilse''' is a Main belt asteroid. It has an unusually slow rotation period, about 3.5 days.
It was discovered by C. H. F. Peters on August 16, 1885, in Clinton, New York and was named after Ilse, a legendary German princess.
Due to the long rotation period, a possible asteroidal satellite of Ilse was proposed by R. P. Binzel in 1987 however no evidence of this has been found.<ref>{{cite web|last=Johnston|first=Robert|title=Other Reports of Asteroid/TNO Companions (Updated 13 July 2013)|url=http://www.johnstonsarchive.net/astro/asteroidmoonsq.html|accessdate=19 November 2013}}</ref>
== References == {{Reflist}}
==External links== * [http://ftp.lowell.edu/pub/elgb/astorb.html The Asteroid Orbital Elements Database] * [http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html Minor Planet Discovery Circumstances] * [http://spiff.rit.edu/richmond/parallax/phot/LCSUMPUB.TXT Asteroid Lightcurve Data File] * {{AstDys|249}} * {{JPL small body}}
{{Minor planets navigator |248 Lameia |number=249 |250 Bettina}} {{Small Solar System bodies}} {{Authority control}}
{{DEFAULTSORT:000249}} Category:Background asteroids Ilse Ilse 18850816
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