P/2010 H3 (SOHO) |
ephemeris |
date |
magn |
radius |
delta |
ra |
dec |
elong |
phase |
PA |
Today | 5 Jul 2025 | 25.4 | 4.009 AU | 3.027 AU | 19h36m | -38°18' | 162.6° | 4.4° | 331° |
Perihelion | 25 May 2026 | 13.3 | 0.044 AU | 1.048 AU | 04h12m | +21°32' | 1.5° | 36.4° | 64° |
Nearest approach | 21 Jun 2026 | 16.0 | 0.919 AU | 0.194 AU | 09h41m | +08°18' | 55.2° | 114.8° | 113° |
This comet is a sunskirter.
Although it may become very bright at perihelion, this will only be for a very short period very close to the sun.
P/2010 H3 (SOHO)- 2025-07-05
astro.vanbuitenen.nl
The interactive orbit chart above shows the comet'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 P/2010 H3 (SOHO) are:
e (Eccentricity) : 0.9855760
q (Perihelion distance) : 0.0437790
i (Inclination) : 23.14750
Ω (Longitude of ascending node) : 77.18120
ω (Argument of perihelion) : 26.07310
L (Longitude of perihelion) : 101.40519
B (Latitude of perihelion) : 9.94915
T (Time of perihelion passage) : 2461185.73470
P (Orbital period in years) : 5.29
Epoch : 2025 Jul 05
Reference : MPC 70361
Classification(s): : Nearly isotropic; Returning (a < 10000 AU); Halley type (P < 200 years); Sunskirter; Marsden
The light curve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations respectively from COBS or the MPC.
The light curve is based on the absolute magnitude and slope parameter as calculated from an MPEC, or the latest values provided by the minor planet center. (20.00 + 5 log[∆] + 5.00 log[r]). The additional green curve shows the effect of forward scattering, occurring when the comet is between the earth and the sun, for a gas-to-dust light ratio δ90 of 0.30. (See Marcus 2007)
The all-sky chart below shows the path of the comet over the same period as the light curve. The comet's current position is marked yellow.
The following chart shows the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.
A more printer-friendly version of the same chart can be found further down this page as well.
The following chart shows the current location of the comet in a smaller, upside-down telescopic field of view.
A printable version of the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.
Ephemerides:
Date Time RA (2000) DEC (2000) delta radius elong phase PA magn
2025-07-05 00:00 UT 19 37 53.7 -38 13 54 3.034 4.014 162.2 4.4 327 25.4
2025-07-05 23:24 UT 19 36 27.7 -38 18 14 3.027 4.009 162.6 4.4 331 25.4
2025-07-06 00:00 UT 19 36 25.4 -38 18 21 3.027 4.009 162.6 4.4 331 25.4
2025-07-07 00:00 UT 19 34 56.4 -38 22 39 3.020 4.003 162.9 4.3 335 25.4
2025-07-08 00:00 UT 19 33 26.6 -38 26 49 3.014 3.997 163.2 4.2 340 25.4
2025-07-09 00:00 UT 19 31 56.0 -38 30 51 3.007 3.992 163.3 4.2 344 25.4
2025-07-10 00:00 UT 19 30 24.9 -38 34 43 3.002 3.986 163.4 4.2 349 25.4
2025-07-11 00:00 UT 19 28 53.1 -38 38 27 2.996 3.981 163.4 4.2 353 25.4
2025-07-12 00:00 UT 19 27 20.8 -38 42 02 2.991 3.975 163.3 4.2 358 25.4
2025-07-13 00:00 UT 19 25 48.0 -38 45 27 2.986 3.969 163.1 4.3 2 25.4
2025-07-14 00:00 UT 19 24 14.8 -38 48 43 2.981 3.964 162.8 4.3 7 25.4
2025-07-15 00:00 UT 19 22 41.3 -38 51 49 2.977 3.958 162.4 4.4 11 25.4
Terminology:
delta: distance between comet and earth in AU
radius: distance between comet 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-comet)
phase: phase angle in degrees (angle sun-comet-earth)
AU: Astronomical Unit (mean distance between earth and sun: 149597870.7 km
Orbital elements usually provided by the MPC (Minor Planet Center).
Observations contributed by observers worldwide, via COBS (Comet Observation Database) or 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.