230 Athamantis

{{Short description|Main-belt asteroid}}

{{Use dmy dates|date=October 2019}}

{{Infobox planet

| minorplanet=yes

| background=#D6D6D6

| name=230 Athamantis

| image=230 Athamantis VLT (2021), deconvolved.pdf

| image_scale =

| caption=

| discoverer=K. de Ball

| discovered=3 September 1882

| mpc_name=(230) Athamantis

| pronounced={{IPAc-en|æ|θ|ə|'|m|æ|n|t|ᵻ|s}}

| alt_names=1949 WG

| named_after=Helle

| mp_category=Main belt

| epoch=31 July 2016 (JD 2457600.5)

| semimajor={{Convert|2.38229|AU|Gm|abbr=on}}

| perihelion={{Convert|2.23641|AU|Gm|abbr=on}}

| aphelion={{Convert|2.52818|AU|Gm|abbr=on|lk=on}}

| eccentricity=0.06124

| period=3.68 yr (1343.0 d)

| inclination=9.443°

| asc_node=239.9°

| arg_peri=139.1°

| mean_anomaly=116.2°

| avg_speed=19.3 km/s

| flattening = 0.24{{efn|1=Flattening derived from the maximum aspect ratio (c/a): $f=1-\backslash frac\{c\}\{a\}$, where (c/a) = {{val|0.76|0.07}}.}}

| mean_diameter={{val|118|2|u=km}}P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56
{{val|111.332|1.231|ul=km}}
110.17 ± 4.57 km

| mass={{val|2.3|1.1|e=18|u=kg}}
{{val|1.89|0.19|e=18|u=kg}}

| density={{val|2.7|1.3|u=g/cm3}}
{{val|2.69|0.43|u=g/cm3}}

| rotation={{Convert|24.0055|h|d|abbr=on|lk=on}}
23.99 h

| spectral_type=S

| abs_magnitude=7.53

| albedo=0.146 (calculated)
{{val|0.164|0.029}}

| single_temperature=

| mean_motion={{Deg2DMS|0.268047|sup=ms}} / day

| orbit_ref={{Cite web |url=https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=230;cad=1 |title=230 Athamantis |work=JPL Small-Body Database |publisher=NASA/Jet Propulsion Laboratory |access-date=12 May 2016}}

| observation_arc=133.58 yr (48791 d)

| uncertainty=0

}}

230 Athamantis is a fairly large main-belt asteroid that was discovered by the German-Austrian astronomer K. de Ball on September 3, 1882, in Bothkamp. It was his only asteroid discovery. The asteroid was named after Athamantis, daughter of Athamas the mythical Greek king of Orchomenus.

Photometric observations of this asteroid gave a light curve with a period of 23.99 hours and a brightness variation of more than 0.20 in magnitude. It has the spectrum of an S-type asteroid. During 1991, the asteroid was observed occulting a star. The resulting chords provided a cross-section diameter estimate of 101.8 km.

file:230Athamantis (Lightcurve Inversion).png

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