|
A/2025 A1 |
| ephemeris |
date |
magn |
radius |
delta |
ra |
dec |
elong |
phase |
PA |
| Today | 28 Sep 2026 | 19.4 | 5.478 AU | 6.221 AU | 10h52m | +30°46' | 39.0° | 6.6° | 324° |
| Nearest approach | 5 Mar 2027 | 18.6 | 5.336 AU | 4.510 AU | 12h13m | +39°26' | 143.1° | 6.4° | 210° |
| Perihelion | 15 Mar 2027 | 18.6 | 5.335 AU | 4.520 AU | 12h10m | +40°03' | 141.6° | 6.7° | 193° |
A/2025 A1- 2026-09-28
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.)
Light curve
The light curve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations from COBS.
The displayed light curve is calculated under the assumption that the object remains inactive. (H=11.20; G=.15).
Charts
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.
Orbital elements
The orbital elements of A/2025 A1 are:
e (Eccentricity) : 0.9988790
q (Perihelion distance) : 5.3353550
i (Inclination) : 33.39600
Ω (Longitude of ascending node) : 101.29420
ω (Argument of perihelion) : 68.39420
L (Longitude of perihelion) : 165.91593
B (Latitude of perihelion) : 30.78042
T (Time of perihelion passage) : 2461479.91500
P (Orbital period in years) : 328349.65
Epoch : 2026 Sep 28
Reference : MPEC 2026-M30
Classification(s): : Nearly isotropic; Returning (a < 10000 AU); External (P > 200 years)
Ephemerides
Date Time RA (2000) DEC (2000) delta radius elong phase PA magn
2026-09-27 00:00 UT 10 50 26.7 +30 49 47 6.240 5.482 37.7 6.4 325 19.4
2026-09-28 00:00 UT 10 51 30.5 +30 47 52 6.230 5.480 38.4 6.5 324 19.4
2026-09-28 23:09 UT 10 52 31.9 +30 46 04 6.221 5.478 39.0 6.6 324 19.4
2026-09-29 00:00 UT 10 52 34.2 +30 46 00 6.221 5.478 39.0 6.6 324 19.4
2026-09-30 00:00 UT 10 53 37.8 +30 44 11 6.211 5.477 39.6 6.7 323 19.4
2026-10-01 00:00 UT 10 54 41.3 +30 42 24 6.201 5.475 40.3 6.8 323 19.4
2026-10-02 00:00 UT 10 55 44.6 +30 40 40 6.190 5.473 40.9 6.9 322 19.4
2026-10-03 00:00 UT 10 56 47.8 +30 38 59 6.180 5.472 41.6 7.0 321 19.4
2026-10-04 00:00 UT 10 57 50.9 +30 37 21 6.170 5.470 42.2 7.1 321 19.4
2026-10-05 00:00 UT 10 58 53.8 +30 35 45 6.159 5.468 42.9 7.1 320 19.4
2026-10-06 00:00 UT 10 59 56.6 +30 34 13 6.148 5.467 43.5 7.2 320 19.4
2026-10-07 00:00 UT 11 00 59.3 +30 32 43 6.137 5.465 44.2 7.3 319 19.4
2026-10-08 00:00 UT 11 02 01.8 +30 31 17 6.126 5.464 44.9 7.4 319 19.4
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.
