|
(101) Helena |
| ephemeris |
date |
magn |
radius |
delta |
ra |
dec |
elong |
phase |
| Today | 9 Dec 2025 | 13.3 | 2.293 AU | 3.161 AU | 18h44m | -29°02' | 23.7° | 9.9° |
| Opposition | 18 Oct 2026 | 11.3 | 2.342 AU | 1.358 AU | 01h17m | +20°59' | 168.1° | 5.0° |
(101) Helena - 2025-12-09
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 Helena are:
e (Eccentricity) : 0.1405228
a (Semimajor axis) : 2.5836608
i (Inclination) : 10.19192
Ω (Longitude of ascending node) : 343.35784
ω (Argument of perihelion) : 347.75681
M (Mean anomaly) : 323.65246
Epoch : 2025 Nov 21
L (Longitude of perihelion) : 331.30215
B (Latitude of perihelion) : -2.15044
P (Orbital period in years) : 4.15
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.
Ephemerides:
Date Time RA (2000) DEC (2000) delta radius elong phase PA magn
2025-12-09 00:00 UT 18 44 23.9 -29 02 53 3.161 2.293 23.7 9.9 99 13.3
2025-12-09 07:31 UT 18 45 06.7 -29 01 33 3.162 2.293 23.5 9.9 99 13.3
2025-12-10 00:00 UT 18 46 40.6 -28 58 35 3.165 2.292 23.2 9.7 99 13.3
2025-12-11 00:00 UT 18 48 57.3 -28 54 10 3.168 2.291 22.7 9.5 100 13.3
2025-12-12 00:00 UT 18 51 14.1 -28 49 39 3.172 2.290 22.2 9.3 100 13.3
2025-12-13 00:00 UT 18 53 30.9 -28 45 00 3.175 2.289 21.7 9.1 100 13.3
2025-12-14 00:00 UT 18 55 47.7 -28 40 15 3.178 2.288 21.2 8.9 100 13.3
2025-12-15 00:00 UT 18 58 04.5 -28 35 22 3.182 2.287 20.7 8.7 100 13.3
2025-12-16 00:00 UT 19 00 21.4 -28 30 23 3.185 2.286 20.2 8.5 100 13.3
2025-12-17 00:00 UT 19 02 38.2 -28 25 17 3.188 2.285 19.7 8.3 100 13.3
2025-12-18 00:00 UT 19 04 55.0 -28 20 04 3.191 2.284 19.2 8.1 100 13.3
2025-12-19 00:00 UT 19 07 11.8 -28 14 44 3.194 2.283 18.7 7.9 100 13.3
2025-12-20 00:00 UT 19 09 28.5 -28 09 17 3.196 2.283 18.2 7.7 101 13.2
2025-12-21 00:00 UT 19 11 45.2 -28 03 43 3.199 2.282 17.7 7.5 101 13.2
2025-12-22 00:00 UT 19 14 01.9 -27 58 02 3.202 2.281 17.2 7.3 101 13.2
2025-12-23 00:00 UT 19 16 18.5 -27 52 15 3.204 2.280 16.8 7.1 101 13.2
2025-12-24 00:00 UT 19 18 35.0 -27 46 20 3.206 2.279 16.3 6.9 102 13.2
2025-12-25 00:00 UT 19 20 51.5 -27 40 19 3.209 2.278 15.8 6.7 102 13.2
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.
