(101) Helena |
ephemeris |
date |
magn |
radius |
delta |
ra |
dec |
elong |
phase |
Today | 9 May 2025 | 12.0 | 2.590 AU | 1.606 AU | 15h08m | -33°41' | 163.5° | 6.3° |
Opposition | 13 May 2025 | 11.9 | 2.583 AU | 1.595 AU | 15h03m | -33°34' | 164.4° | 6.0° |
(101) Helena - 2025-05-09
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) : 0.1405820
a (Semimajor axis) : 2.5835577
i (Inclination) : 10.19186
Ω (Longitude of ascending node) : 343.36447
ω (Argument of perihelion) : 347.78344
M (Mean anomaly) : 276.16155
Epoch : 2025 May 05
L (Longitude of perihelion) : 331.33502
B (Latitude of perihelion) : -2.14582
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.
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
2025-05-09 00:00 UT 15 08 58.4 -33 41 48 1.606 2.590 163.5 6.3 355 12.0
2025-05-09 10:44 UT 15 08 28.8 -33 41 14 1.604 2.589 163.7 6.3 357 12.0
2025-05-10 00:00 UT 15 07 52.2 -33 40 28 1.603 2.588 163.9 6.2 359 12.0
2025-05-11 00:00 UT 15 06 45.9 -33 38 57 1.600 2.587 164.1 6.1 4 12.0
2025-05-12 00:00 UT 15 05 39.5 -33 37 13 1.598 2.585 164.3 6.1 8 12.0
2025-05-13 00:00 UT 15 04 33.0 -33 35 17 1.596 2.584 164.4 6.0 13 11.9
2025-05-14 00:00 UT 15 03 26.7 -33 33 10 1.594 2.582 164.4 6.0 17 11.9
2025-05-15 00:00 UT 15 02 20.4 -33 30 51 1.593 2.581 164.3 6.1 22 11.9
2025-05-16 00:00 UT 15 01 14.4 -33 28 21 1.592 2.579 164.1 6.2 26 11.9
2025-05-17 00:00 UT 15 00 08.7 -33 25 40 1.591 2.577 163.9 6.3 31 11.9
2025-05-18 00:00 UT 14 59 03.4 -33 22 48 1.590 2.576 163.5 6.4 35 12.0
2025-05-19 00:00 UT 14 57 58.6 -33 19 45 1.590 2.574 163.1 6.6 39 12.0
2025-05-20 00:00 UT 14 56 54.3 -33 16 33 1.589 2.573 162.6 6.7 43 12.0
2025-05-21 00:00 UT 14 55 50.6 -33 13 10 1.590 2.571 162.1 6.9 46 12.0
2025-05-22 00:00 UT 14 54 47.7 -33 09 38 1.590 2.570 161.5 7.2 50 12.0
2025-05-23 00:00 UT 14 53 45.5 -33 05 57 1.590 2.568 160.9 7.4 53 12.0
2025-05-24 00:00 UT 14 52 44.2 -33 02 07 1.591 2.567 160.2 7.7 56 12.0
2025-05-25 00:00 UT 14 51 43.8 -32 58 09 1.592 2.565 159.4 8.0 59 12.0
2025-05-26 00:00 UT 14 50 44.5 -32 54 03 1.594 2.564 158.7 8.3 61 12.0
2025-05-27 00:00 UT 14 49 46.2 -32 49 49 1.595 2.562 157.9 8.6 64 12.0
2025-05-28 00:00 UT 14 48 49.1 -32 45 29 1.597 2.561 157.0 8.9 66 12.1
2025-05-29 00:00 UT 14 47 53.3 -32 41 02 1.599 2.559 156.2 9.2 68 12.1
2025-05-30 00:00 UT 14 46 58.7 -32 36 29 1.602 2.558 155.3 9.5 70 12.1
2025-05-31 00:00 UT 14 46 05.5 -32 31 51 1.604 2.556 154.4 9.9 72 12.1
2025-06-01 00:00 UT 14 45 13.6 -32 27 07 1.607 2.555 153.5 10.2 74 12.1
2025-06-02 00:00 UT 14 44 23.3 -32 22 20 1.610 2.553 152.6 10.5 75 12.1
2025-06-03 00:00 UT 14 43 34.4 -32 17 28 1.613 2.552 151.7 10.9 77 12.2
2025-06-04 00:00 UT 14 42 47.2 -32 12 32 1.617 2.550 150.7 11.2 78 12.2
2025-06-05 00:00 UT 14 42 01.5 -32 07 34 1.620 2.549 149.8 11.6 80 12.2
2025-06-06 00:00 UT 14 41 17.4 -32 02 33 1.624 2.547 148.8 11.9 81 12.2
2025-06-07 00:00 UT 14 40 35.0 -31 57 29 1.629 2.546 147.9 12.2 82 12.2
2025-06-08 00:00 UT 14 39 54.4 -31 52 24 1.633 2.544 146.9 12.6 83 12.2
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.