| 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
$$
M_a = (2.448 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
2.448 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-05-12 00:00 |
10:21:28.52 |
+04:16:02.0 |
HIP 50749 |
4.34 |
| 2026-05-12 12:00 |
10:21:30.57 |
+04:16:11.8 |
HIP 50749 |
3.81 |
| 2026-05-13 00:00 |
10:21:32.74 |
+04:16:20.8 |
HIP 50749 |
3.27 |
| 2026-05-13 12:00 |
10:21:35.02 |
+04:16:29.2 |
HIP 50749 |
2.71 |
| 2026-05-14 00:00 |
10:21:37.42 |
+04:16:36.9 |
HIP 50749 |
2.16 |
| 2026-05-14 12:00 |
10:21:39.94 |
+04:16:43.9 |
HIP 50749 |
1.63 |
| 2026-05-15 00:00 |
10:21:42.58 |
+04:16:50.2 |
HIP 50749 |
1.23 |
| 2026-05-15 12:00 |
10:21:45.33 |
+04:16:55.9 |
HIP 50749 |
1.13 |
| 2026-05-16 00:00 |
10:21:48.20 |
+04:17:00.8 |
HIP 50749 |
1.44 |
| 2026-05-16 12:00 |
10:21:51.18 |
+04:17:05.1 |
HIP 50749 |
2.01 |
| 2026-05-17 00:00 |
10:21:54.29 |
+04:17:08.7 |
HIP 50749 |
2.70 |
| 2026-05-17 12:00 |
10:21:57.50 |
+04:17:11.6 |
HIP 50749 |
3.46 |
| 2026-05-18 00:00 |
10:22:00.84 |
+04:17:13.8 |
HIP 50749 |
4.26 |
| 2026-05-18 12:00 |
10:22:04.29 |
+04:17:15.4 |
HIP 50749 |
5.11 |
| 2026-05-19 00:00 |
10:22:07.85 |
+04:17:16.2 |
HIP 50749 |
5.98 |
| 2026-05-19 12:00 |
10:22:11.53 |
+04:17:16.4 |
HIP 50749 |
6.90 |
| 2026-05-20 00:00 |
10:22:15.32 |
+04:17:15.8 |
HIP 50749 |
7.84 |
| 2026-05-20 12:00 |
10:22:19.23 |
+04:17:14.6 |
HIP 50749 |
8.81 |
| 2026-05-21 00:00 |
10:22:23.25 |
+04:17:12.7 |
HIP 50749 |
9.81 |
| 2026-05-21 12:00 |
10:22:27.38 |
+04:17:10.1 |
HIP 50749 |
10.84 |
| 2026-05-22 00:00 |
10:22:31.63 |
+04:17:06.8 |
HIP 50749 |
11.90 |
| 2026-05-22 12:00 |
10:22:35.99 |
+04:17:02.8 |
HIP 50749 |
12.99 |
| 2026-05-23 00:00 |
10:22:40.46 |
+04:16:58.2 |
HIP 50749 |
14.11 |
| 2026-05-23 12:00 |
10:22:45.05 |
+04:16:52.8 |
HIP 50749 |
15.25 |
| 2026-05-24 00:00 |
10:22:49.74 |
+04:16:46.8 |
HIP 50749 |
16.43 |
| 2026-05-24 12:00 |
10:22:54.55 |
+04:16:40.1 |
HIP 50749 |
17.63 |
| 2026-05-25 00:00 |
10:22:59.47 |
+04:16:32.7 |
HIP 50749 |
18.86 |
| 2026-05-25 12:00 |
10:23:04.49 |
+04:16:24.6 |
HIP 50749 |
20.12 |
| 2026-05-26 00:00 |
10:23:09.63 |
+04:16:15.9 |
HIP 50749 |
21.41 |
| 2026-05-26 12:00 |
10:23:14.88 |
+04:16:06.5 |
HIP 50749 |
22.73 |
| 2026-05-27 00:00 |
10:23:20.23 |
+04:15:56.3 |
HIP 50749 |
24.07 |
| 2026-05-27 12:00 |
10:23:25.70 |
+04:15:45.6 |
HIP 50749 |
25.45 |
| 2026-05-28 00:00 |
10:23:31.27 |
+04:15:34.1 |
HIP 50983 |
25.43 |
| 2026-05-28 12:00 |
10:23:36.95 |
+04:15:21.9 |
HIP 50983 |
24.46 |
| 2026-05-29 00:00 |
10:23:42.73 |
+04:15:09.1 |
HIP 50983 |
23.52 |
| 2026-05-29 12:00 |
10:23:48.62 |
+04:14:55.6 |
HIP 50983 |
22.62 |
| 2026-05-30 00:00 |
10:23:54.62 |
+04:14:41.5 |
HIP 50983 |
21.78 |
| 2026-05-30 12:00 |
10:24:00.73 |
+04:14:26.6 |
HIP 50983 |
21.01 |
| 2026-05-31 00:00 |
10:24:06.94 |
+04:14:11.1 |
HIP 50983 |
20.32 |
| 2026-05-31 12:00 |
10:24:13.26 |
+04:13:55.0 |
HIP 50983 |
19.72 |
| 2026-06-01 00:00 |
10:24:19.68 |
+04:13:38.1 |
HIP 50983 |
19.25 |
| 2026-06-01 12:00 |
10:24:26.20 |
+04:13:20.6 |
HIP 50983 |
18.90 |
| 2026-06-02 00:00 |
10:24:32.83 |
+04:13:02.4 |
HIP 50983 |
18.69 |