| Parameter |
Value |
| Designation |
P/2025 D2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2029-03-11T21:54:39.648960Z |
| Orbit solution date (soln_date, UTC) |
2026-04-21T11:12:20Z |
| Obs used |
31 |
| NEO |
- |
| M1 |
13.200 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-02-22T07:51:00.662400Z |
| Discovery magnitude (MPC) |
22.06 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2025-07-07.0000000 |
| e |
0.14784789 |
| q (au) |
7.418671 |
| a (au) |
8.705807 |
| i (deg) |
5.358338 |
| Ω (om, deg) |
257.181922 |
| ω (w, deg) |
317.883851 |
| M (ma, deg) |
308.434208 |
Magnitude
Scatter + Global Linear
$$
M_a = (3.187 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
3.187 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
10.000 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
11:15:45.28 |
-00:23:55.1 |
HIP 55023 |
18.03 |
| 2026-09-20 12:00 |
11:16:02.28 |
-00:25:45.6 |
HIP 55023 |
19.84 |
| 2026-09-21 00:00 |
11:16:19.26 |
-00:27:36.3 |
HIP 55023 |
22.47 |
| 2026-09-21 12:00 |
11:16:36.23 |
-00:29:27.0 |
HIP 55023 |
25.68 |
| 2026-09-22 00:00 |
11:16:53.19 |
-00:31:17.8 |
HIP 55023 |
29.26 |
| 2026-09-22 12:00 |
11:17:10.14 |
-00:33:08.6 |
HIP 55023 |
33.11 |
| 2026-09-23 00:00 |
11:17:27.07 |
-00:34:59.6 |
HIP 55023 |
37.13 |
| 2026-09-23 12:00 |
11:17:43.99 |
-00:36:50.5 |
HIP 55304 |
37.35 |
| 2026-09-24 00:00 |
11:18:00.90 |
-00:38:41.6 |
HIP 55304 |
35.79 |
| 2026-09-24 12:00 |
11:18:17.79 |
-00:40:32.7 |
HIP 55304 |
34.77 |
| 2026-09-25 00:00 |
11:18:34.66 |
-00:42:23.8 |
HIP 55304 |
34.36 |
| 2026-09-25 12:00 |
11:18:51.52 |
-00:44:15.0 |
HIP 55304 |
34.56 |
| 2026-09-26 00:00 |
11:19:08.36 |
-00:46:06.2 |
HIP 55438 |
31.29 |
| 2026-09-26 12:00 |
11:19:25.19 |
-00:47:57.5 |
HIP 55438 |
27.87 |
| 2026-09-27 00:00 |
11:19:42.00 |
-00:49:48.8 |
HIP 55438 |
24.85 |
| 2026-09-27 12:00 |
11:19:58.79 |
-00:51:40.1 |
HIP 55438 |
22.37 |
| 2026-09-28 00:00 |
11:20:15.56 |
-00:53:31.5 |
HIP 55438 |
20.62 |
| 2026-09-28 12:00 |
11:20:32.31 |
-00:55:22.9 |
HIP 55438 |
19.81 |
| 2026-09-29 00:00 |
11:20:49.04 |
-00:57:14.3 |
HIP 55438 |
20.05 |
| 2026-09-29 12:00 |
11:21:05.76 |
-00:59:05.8 |
HIP 55438 |
21.29 |
| 2026-09-30 00:00 |
11:21:22.45 |
-01:00:57.3 |
HIP 55438 |
23.37 |
| 2026-09-30 12:00 |
11:21:39.12 |
-01:02:48.8 |
HIP 55438 |
26.09 |
| 2026-10-01 00:00 |
11:21:55.78 |
-01:04:40.2 |
HIP 55438 |
29.27 |
| 2026-10-01 12:00 |
11:22:12.41 |
-01:06:31.8 |
HIP 55438 |
32.78 |
| 2026-10-02 00:00 |
11:22:29.01 |
-01:08:23.3 |
HIP 55664 |
35.76 |
| 2026-10-02 12:00 |
11:22:45.60 |
-01:10:14.8 |
HIP 55664 |
31.44 |
| 2026-10-03 00:00 |
11:23:02.16 |
-01:12:06.3 |
HIP 55664 |
27.18 |
| 2026-10-03 12:00 |
11:23:18.70 |
-01:13:57.8 |
HIP 55664 |
23.04 |
| 2026-10-04 00:00 |
11:23:35.21 |
-01:15:49.3 |
HIP 55664 |
19.09 |
| 2026-10-04 12:00 |
11:23:51.70 |
-01:17:40.8 |
HIP 55664 |
15.45 |
| 2026-10-05 00:00 |
11:24:08.16 |
-01:19:32.2 |
HIP 55664 |
12.40 |
| 2026-10-05 12:00 |
11:24:24.60 |
-01:21:23.7 |
HIP 55664 |
10.48 |
| 2026-10-06 00:00 |
11:24:41.01 |
-01:23:15.1 |
HIP 55664 |
10.31 |
| 2026-10-06 12:00 |
11:24:57.39 |
-01:25:06.4 |
HIP 55664 |
11.97 |
| 2026-10-07 00:00 |
11:25:13.74 |
-01:26:57.8 |
HIP 55664 |
14.85 |
| 2026-10-07 12:00 |
11:25:30.07 |
-01:28:49.1 |
HIP 55664 |
18.38 |
| 2026-10-08 00:00 |
11:25:46.37 |
-01:30:40.3 |
HIP 55664 |
22.24 |
| 2026-10-08 12:00 |
11:26:02.63 |
-01:32:31.6 |
HIP 55664 |
26.30 |
| 2026-10-09 00:00 |
11:26:18.87 |
-01:34:22.7 |
HIP 55941 |
24.90 |
| 2026-10-09 12:00 |
11:26:35.07 |
-01:36:13.8 |
HIP 55941 |
20.48 |
| 2026-10-10 00:00 |
11:26:51.24 |
-01:38:04.9 |
HIP 55941 |
16.10 |
| 2026-10-10 12:00 |
11:27:07.38 |
-01:39:55.8 |
HIP 55941 |
11.76 |
| 2026-10-11 00:00 |
11:27:23.49 |
-01:41:46.7 |
HIP 55941 |
7.56 |