283 Emma
Main-belt asteroid
title: "283 Emma" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["emma-asteroids", "discoveries-by-auguste-charlois", "named-minor-planets", "binary-asteroids", "x-type-asteroids-(tholen)", "astronomical-objects-discovered-in-1889"] description: "Main-belt asteroid" topic_path: "general/emma-asteroids" source: "https://en.wikipedia.org/wiki/283_Emma" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Main-belt asteroid ::
::data[format=table title="Infobox planet"]
| Field | Value |
|---|---|
| minorplanet | yes |
| background | #D6D6D6 |
| name | 283 Emma |
| image | 283 Emma.png |
| image_scale | Lightcurve-base 3D-model of Emma on the top with an image of the asteroid on the bottom. |
| caption | A three-dimensional model of 283 Emma based on its light curve |
| discoverer | Auguste Charlois |
| discovered | 8 February 1889 |
| mpc_name | (283) Emma |
| alt_names | A889 CA, |
| pronounced | |
| mp_category | Main belt (Emma) |
| epoch | 31 July 2016 (JD 2457600.5) |
| semimajor | 3.04688 AU |
| perihelion | 2.59675 AU |
| aphelion | 3.49701 AU |
| eccentricity | 0.14773 |
| period | 5.32 yr (1942.6 d) |
| inclination | 7.99162° |
| asc_node | 304.369° |
| arg_peri | 53.7020° |
| mean_anomaly | 127.107° |
| avg_speed | 17.07 km/s |
| satellites | 1 () |
| dimensions | (IRAS) |
| 160±10 km (AO) | |
| mass | 1.38 kg |
| density | |
| rotation | 6.896 h |
| abs_magnitude | 8.72 |
| albedo | (Dark) |
| mean_motion | / day |
| orbit_ref | |
| observation_arc | 122.26 yr (44655 d) |
| uncertainty | 0 |
| :: |
| minorplanet = yes | background = #D6D6D6 | name = 283 Emma | image = 283 Emma.png | image_scale = Lightcurve-base 3D-model of Emma on the top with an image of the asteroid on the bottom. | caption = A three-dimensional model of 283 Emma based on its light curve | discoverer = Auguste Charlois | discovered = 8 February 1889 | mpc_name = (283) Emma | alt_names = A889 CA, | pronounced = | mp_category = Main belt (Emma) | epoch = 31 July 2016 (JD 2457600.5) | semimajor = 3.04688 AU | perihelion = 2.59675 AU | aphelion = 3.49701 AU | eccentricity = 0.14773 | period = 5.32 yr (1942.6 d) | inclination = 7.99162° | asc_node = 304.369° | arg_peri = 53.7020° | mean_anomaly = 127.107° | avg_speed = 17.07 km/s | satellites = 1 () | dimensions = (IRAS) 160±10 km (AO) | mass = 1.38 kg | density = | rotation = 6.896 h | spectral_type = | abs_magnitude = 8.72 | albedo = (Dark) | mean_motion = / day | orbit_ref = | observation_arc = 122.26 yr (44655 d) | uncertainty = 0
283 Emma is a large asteroid of the asteroid belt and the namesake of the Emma family. It was discovered by Auguste Charlois on 8 February 1889, in Nice, France. The reason for its name is unknown.
Measurements made with the IRAS observatory give a diameter of and a geometric albedo of . By comparison, the MIPS photometer on the Spitzer Space Telescope gives a diameter of and a geometric albedo of . When the asteroid was observed occulting a star, the results showed a diameter of .
Satellite
A companion for 283 Emma was detected on 14 July 2003 by W. J. Merline et al. using the Keck II telescope and is designated S/2003 (283) 1. The discovery was reported in the International Astronomical Union Circular (IAUC) 8165. The satellite orbits at a semi-major axis of about 581 km with an eccentricity of 0.12. Emma has a Hill sphere with a radius of about 28,000 km.
References
|type=2008-10-30 last obs |title=JPL Small-Body Database Browser: 283 Emma |website=Solar System Dynamics |url=https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=283 |accessdate=11 May 2016}}
|last=Marchis |first=Franck |author2=P. Descamps |author3=J. Berthier |author4=D. hestroffer |author5=F. vachier |author6=M. Baek |author7=A. Harris |author8=D. Nesvorny |title=Main Belt Binary Asteroidal Systems With Eccentric Mutual Orbits |journal=Icarus |volume=195 |issue=1 |pages=295–316 |date=2008 |doi=10.1016/j.icarus.2007.12.010 |arxiv=0804.1385 |bibcode=2008Icar..195..295M|s2cid=119244052
| first1 = Erin Lee | last1 = Ryan | first2 = Donald R. | last2 = Mizuno | first3 = Sachindev S. | last3 = Shenoy | first4 = Charles E. | last4 = Woodward | first5 = Sean | last5 = Carey | first6 = Alberto | last6 = Noriega-Crespo | first7 = Kathleen E. | last7 = Kraemer | first8 = Stephan D. | last8 = Price | display-authors = 1 | title = The Kilometer-Sized Main Belt Asteroid Population as Revealed by Spitzer |date=April 2012 |eprint = 1204.1116 | mode = cs2 | class = astro-ph.EP }}
References
- {{dict.com. Emma
- Jim Baer. (2010-12-12). "Recent Asteroid Mass Determinations". Personal Website.
- Lutz D. Schmadel. (2003). "Dictionary of Minor Planet Names". Springer Science & Business Media.
- (27 July 2003). "IAUC 8165: S/2003 (283) 1; NOVAE IN M31". IAU.
::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::