(85) Io |
ephemeris |
date |
magn |
radius |
delta |
ra |
dec |
elong |
phase |
Today | 15 Sep 2025 | 11.3 | 2.261 AU | 1.382 AU | 01h46m | +14°19' | 142.1° | 15.8° |
Opposition | 16 Oct 2025 | 10.4 | 2.313 AU | 1.317 AU | 01h27m | +09°02' | 179.5° | 0.2° |
(85) Io - 2025-09-15
astro.vanbuitenen.nl
The interactive orbit chart above shows the body's path through the solar system and its position at the given date.
Green and blue lines are shown perpendicular to the ecliptic plane: Green if the path is above the ecliptic plane, blue if it is below.
(Left-click and drag to rotate the view; Right-click and drag to move the view; Use scroll wheel to zoom in our out.)
The orbital elements of Io are:
e (Eccentricity) : 0.1932075
a (Semimajor axis) : 2.6533729
i (Inclination) : 11.96037
Ω (Longitude of ascending node) : 203.04302
ω (Argument of perihelion) : 122.89363
M (Mean anomaly) : 2.65610
Epoch : 2025 May 05
L (Longitude of perihelion) : 146.51265
B (Latitude of perihelion) : 10.02112
P (Orbital period in years) : 4.32
The light curve chart below shows the estimated development of the minor planet's magnitude.
The all-sky chart below shows the path of the minor planet over the same period as the light curve. The current position is marked yellow.
The following chart shows the path of the minor planet in the next few days. The field of view is optimized for (~10x50) binoculars and finderscopes.
A more printer-friendly version of the same chart can be found below.
Ephemerides:
Date Time RA (2000) DEC (2000) delta radius elong phase PA magn
2025-09-15 00:00 UT 01 46 29.5 +14 19 43 1.382 2.261 142.1 15.8 245 11.3
2025-09-15 14:32 UT 01 46 18.4 +14 15 14 1.378 2.262 142.8 15.6 245 11.3
2025-09-16 00:00 UT 01 46 10.8 +14 12 16 1.376 2.263 143.2 15.4 245 11.3
2025-09-17 00:00 UT 01 45 50.5 +14 04 35 1.371 2.264 144.3 15.0 245 11.2
2025-09-18 00:00 UT 01 45 28.6 +13 56 41 1.366 2.266 145.4 14.6 245 11.2
2025-09-19 00:00 UT 01 45 05.1 +13 48 33 1.361 2.268 146.5 14.1 245 11.2
2025-09-20 00:00 UT 01 44 40.1 +13 40 12 1.356 2.269 147.7 13.7 245 11.2
2025-09-21 00:00 UT 01 44 13.5 +13 31 38 1.352 2.271 148.8 13.2 245 11.1
2025-09-22 00:00 UT 01 43 45.5 +13 22 52 1.347 2.272 149.9 12.8 245 11.1
2025-09-23 00:00 UT 01 43 16.0 +13 13 53 1.343 2.274 151.1 12.3 245 11.1
2025-09-24 00:00 UT 01 42 45.2 +13 04 42 1.339 2.276 152.2 11.9 245 11.1
2025-09-25 00:00 UT 01 42 13.0 +12 55 19 1.336 2.277 153.4 11.4 245 11.1
2025-09-26 00:00 UT 01 41 39.6 +12 45 45 1.332 2.279 154.6 10.9 245 11.0
2025-09-27 00:00 UT 01 41 04.9 +12 36 01 1.329 2.280 155.7 10.4 245 11.0
2025-09-28 00:00 UT 01 40 29.1 +12 26 06 1.326 2.282 156.9 9.9 244 11.0
2025-09-29 00:00 UT 01 39 52.1 +12 16 01 1.323 2.284 158.1 9.4 244 11.0
2025-09-30 00:00 UT 01 39 14.1 +12 05 47 1.321 2.285 159.3 8.9 244 10.9
2025-10-01 00:00 UT 01 38 35.1 +11 55 23 1.319 2.287 160.5 8.4 244 10.9
2025-10-02 00:00 UT 01 37 55.2 +11 44 52 1.317 2.289 161.7 7.9 244 10.9
2025-10-03 00:00 UT 01 37 14.4 +11 34 13 1.315 2.290 162.9 7.4 244 10.9
2025-10-04 00:00 UT 01 36 32.8 +11 23 26 1.313 2.292 164.1 6.9 244 10.8
2025-10-05 00:00 UT 01 35 50.5 +11 12 33 1.312 2.294 165.3 6.3 244 10.8
2025-10-06 00:00 UT 01 35 07.5 +11 01 33 1.311 2.295 166.5 5.8 244 10.8
2025-10-07 00:00 UT 01 34 23.9 +10 50 28 1.310 2.297 167.8 5.3 244 10.8
2025-10-08 00:00 UT 01 33 39.8 +10 39 19 1.310 2.299 169.0 4.8 244 10.7
2025-10-09 00:00 UT 01 32 55.1 +10 28 04 1.310 2.300 170.2 4.2 244 10.7
2025-10-10 00:00 UT 01 32 10.1 +10 16 47 1.310 2.302 171.5 3.7 244 10.7
2025-10-11 00:00 UT 01 31 24.8 +10 05 26 1.310 2.304 172.7 3.2 245 10.7
2025-10-12 00:00 UT 01 30 39.2 +09 54 03 1.311 2.306 173.9 2.6 245 10.6
2025-10-13 00:00 UT 01 29 53.4 +09 42 38 1.311 2.307 175.2 2.1 245 10.6
2025-10-14 00:00 UT 01 29 07.5 +09 31 12 1.313 2.309 176.4 1.6 246 10.6
2025-10-15 00:00 UT 01 28 21.6 +09 19 46 1.314 2.311 177.6 1.0 247 10.5
Terminology:
delta: distance between minor planet and earth in AU
radius: distance between minor planet and sun in AU
magn: magnitude (brightness) estimate
ra: right ascension in hours (24h = 360deg)
dec: declination in degrees
elong: elongation in degrees (angle sun-earth-minor planet)
phase: phase angle in degrees (angle sun-minor planet-earth)
AU: Astronomical Unit (mean distance between earth and sun: 149597870.7 km
Orbital elements provided by the MPC (Minor Planet Center).
Calculations by a modified version of AAPlus, a C# implementation of the AA+ project by PJ Naughter from the algorithms presented in the book "Astronomical Algorithms" by Jean Meeus.
NGC2000 dso catalog and star labels from VizieR as provided by the Strasbourg astronomical Data Center.
Tycho2 catalog from the ESO archive.