What is 243 Ida?
{{Infobox Planet | bgcolour=#FFFFC0 | minorplanet = yes | name=243 Ida | image=243 ida.jpg | caption=[[Galileo spacecraft|Galileo]] image of 243 Ida. The tiny dot to the right is its moon, Dactyl. | discovery_ref= <ref>[http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html Discovery Circumstances: Numbered Minor Planets], Minor Planet Centre {{WebCite|url=https://www.webcitation.org/5PkgpxwX0|date =2007-06-20}}</ref> | discoverer=[[Johann Palisa]] | discovered=September 29, 1884 | alt_names=A910 CD; 1988 DB<sub>1</sub> | mp_category=[[Main belt]] ([[Koronis family|Koronis]]) | epoch=October 22, 2004 ([[Julian day|JD]] 2453300.5) | semimajor=428.025 [[Giga|G]][[metre|m]] (2.861 [[Astronomical unit|AU]]) | perihelion=408.207 Gm (2.729 AU) | aphelion=447.843 Gm (2.994 AU) | eccentricity=0.046 | period=1767.724 [[day|d]] (4.84 [[Julian year (astronomy)|a]]) | inclination=1.138[[degree (angle)|°]] | asc_node=324.218° | arg_peri=108.754° | mean_anomaly=245.469° | avg_speed=17.60&nbsp;km/[[second|s]] | satellites=[[Dactyl (moon)|Dactyl]] | dimensions=53.6×24.0×15.2 [[kilometre|km]] | mean_radius=15.7&nbsp;km | mass=4.2×10<sup>16</sup> [[kilogram|kg]] [http://www.psi.edu/pds/archive/astdata/DENSITY/densbest.tab <sup>1</sup>] | density=2.6&nbsp;g/[[cubic centimetre|cm³]] [http://www.psi.edu/pds/archive/astdata/DENSITY/densbest.tab <sup>1</sup>] | surface_grav=0.0109&nbsp;m/s² | escape_velocity=0.0185&nbsp;km/s | rotation=0.1931 d (4 h 37&nbsp;min) [http://www.astrosurf.com/aude-old/map_files/AstVarMAP01-2003.htm <sup>2</sup>] | spectral_type=[[S-type asteroid|S]] | abs_magnitude=9.94 | albedo=0.2382 [http://www.psi.edu/pds/archive/astdata/ALBEDOS/albedos.tab <sup>3</sup>] | temp_name1 = [[Kelvin]] | mean_temp_1 = ~158 | max_temp_1 = 229 | temp_name2 = [[Celsius]] | max_temp_2 = -45° }} '''243 Ida''' is a [[Asteroid belt|Main belt]] [[asteroid]] with pictures taken by the ''[[Galileo (spacecraft)|Galileo]]'' spacecraft on August 28, 1993. It was the first [[binary asteroid]] to be found and is a member of the [[Koronis