403 Cyane

{{Short description|Main-belt asteroid}}

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

{{Infobox planet

| minorplanet=yes

| background=#D6D6D6

| image=403Cyane (Lightcurve Inversion).png

| image_scale =

| caption=A three-dimensional model of 403 Cyane based on its light curve

| name=403 Cyane

| discoverer=Auguste Charlois

| discovered=18 May 1895

| mpc_name=(403) Cyane

| pronounced={{IPAc-en|'|s|aɪ|ə|n|iː}}Noah Webster (1884) A Practical Dictionary of the English Language

| adjective=Cyanean {{IPAc-en|s|aɪ|ˈ|eɪ|n|iː|ə|n}},{{OED|cyanean}} {{IPAc-en|s|aɪ|ə|ˈ|n|iː|ə|n}}

| alt_names=1895 BX

| named_after=Cyane

| mp_category=Main belt

| epoch=31 July 2016 (JD 2457600.5)

| semimajor={{Convert|2.80979|AU|Gm|abbr=on}}

| perihelion={{Convert|2.53799|AU|Gm|abbr=on}}

| aphelion={{Convert|3.08158|AU|Gm|abbr=on|lk=on}}

| eccentricity=0.096731

| period=4.71 yr (1720.3 d)

| inclination=9.14883°

| asc_node=244.411°

| arg_peri=255.602°

| mean_anomaly=350.231°

| dimensions={{val|49.49|1.1|ul=km}}

| mass=

| density=

| rotation={{Convert|12.283|h|d|abbr=on|lk=on}}

| spectral_type=

| abs_magnitude=9.0

| albedo={{val|0.1653|0.007}}

| mean_motion={{Deg2DMS|0.209264|sup=ms}} / day

| orbit_ref={{Cite web |url=https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=403;cad=1 |title=403 Cyane (1895 BX) |work=JPL Small-Body Database |publisher=NASA/Jet Propulsion Laboratory |access-date=10 May 2016}}

| observation_arc=120.89 yr (44155 d)

| uncertainty=0

}}

403 Cyane is a typical Main belt asteroid.

It was discovered by Auguste Charlois on 18 May 1895 in Nice.