| Parameter |
Value |
| Designation |
P/2025 A2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-10-05T15:17:25.509120Z |
| Orbit solution date (soln_date, UTC) |
2025-04-11T14:45:09Z |
| Obs used |
66 |
| NEO |
- |
| M1 |
16.100 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-01-07T09:59:40.761600Z |
| Discovery magnitude (MPC) |
21.00 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2025-01-22.0000000 |
| e |
0.32241041 |
| q (au) |
3.446251 |
| a (au) |
5.086044 |
| i (deg) |
20.732644 |
| Ω (om, deg) |
189.324202 |
| ω (w, deg) |
278.033834 |
| M (ma, deg) |
9.311389 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.115 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.115 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.999 |
| 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) |
| 2026-06-01 00:00 |
12:13:46.38 |
+01:01:25.3 |
HIP 59500 |
26.13 |
| 2026-06-01 12:00 |
12:13:50.14 |
+01:02:05.2 |
HIP 59500 |
26.81 |
| 2026-06-02 00:00 |
12:13:54.09 |
+01:02:43.6 |
HIP 59500 |
27.57 |
| 2026-06-02 12:00 |
12:13:58.22 |
+01:03:20.4 |
HIP 59500 |
28.41 |
| 2026-06-03 00:00 |
12:14:02.54 |
+01:03:55.7 |
HIP 59500 |
29.33 |
| 2026-06-03 12:00 |
12:14:07.05 |
+01:04:29.5 |
HIP 59500 |
30.32 |
| 2026-06-04 00:00 |
12:14:11.74 |
+01:05:01.7 |
HIP 59771 |
30.29 |
| 2026-06-04 12:00 |
12:14:16.62 |
+01:05:32.5 |
HIP 59771 |
29.16 |
| 2026-06-05 00:00 |
12:14:21.68 |
+01:06:01.7 |
HIP 59771 |
28.05 |
| 2026-06-05 12:00 |
12:14:26.93 |
+01:06:29.4 |
HIP 59771 |
26.96 |
| 2026-06-06 00:00 |
12:14:32.36 |
+01:06:55.6 |
HIP 59771 |
25.90 |
| 2026-06-06 12:00 |
12:14:37.98 |
+01:07:20.3 |
HIP 59771 |
24.88 |
| 2026-06-07 00:00 |
12:14:43.77 |
+01:07:43.5 |
HIP 59771 |
23.90 |
| 2026-06-07 12:00 |
12:14:49.75 |
+01:08:05.2 |
HIP 59771 |
22.99 |
| 2026-06-08 00:00 |
12:14:55.92 |
+01:08:25.5 |
HIP 59771 |
22.16 |
| 2026-06-08 12:00 |
12:15:02.26 |
+01:08:44.3 |
HIP 59771 |
21.42 |
| 2026-06-09 00:00 |
12:15:08.78 |
+01:09:01.6 |
HIP 59771 |
20.80 |
| 2026-06-09 12:00 |
12:15:15.48 |
+01:09:17.4 |
HIP 59771 |
20.32 |
| 2026-06-10 00:00 |
12:15:22.37 |
+01:09:31.8 |
HIP 59771 |
20.00 |
| 2026-06-10 12:00 |
12:15:29.43 |
+01:09:44.8 |
HIP 59771 |
19.84 |
| 2026-06-11 00:00 |
12:15:36.66 |
+01:09:56.3 |
HIP 59771 |
19.88 |
| 2026-06-11 12:00 |
12:15:44.08 |
+01:10:06.3 |
HIP 59771 |
20.12 |
| 2026-06-12 00:00 |
12:15:51.67 |
+01:10:15.0 |
HIP 59771 |
20.56 |
| 2026-06-12 12:00 |
12:15:59.44 |
+01:10:22.2 |
HIP 59771 |
21.21 |
| 2026-06-13 00:00 |
12:16:07.39 |
+01:10:28.0 |
HIP 59771 |
22.05 |
| 2026-06-13 12:00 |
12:16:15.50 |
+01:10:32.3 |
HIP 59771 |
23.08 |
| 2026-06-14 00:00 |
12:16:23.80 |
+01:10:35.3 |
HIP 59771 |
24.28 |
| 2026-06-14 12:00 |
12:16:32.27 |
+01:10:36.9 |
HIP 59771 |
25.64 |
| 2026-06-15 00:00 |
12:16:40.91 |
+01:10:37.1 |
HIP 59771 |
27.14 |
| 2026-06-15 12:00 |
12:16:49.72 |
+01:10:35.9 |
HIP 59771 |
28.77 |
| 2026-06-16 00:00 |
12:16:58.70 |
+01:10:33.3 |
HIP 59970 |
28.12 |
| 2026-06-16 12:00 |
12:17:07.85 |
+01:10:29.4 |
HIP 59970 |
27.05 |
| 2026-06-17 00:00 |
12:17:17.18 |
+01:10:24.1 |
HIP 60062 |
25.94 |
| 2026-06-17 12:00 |
12:17:26.67 |
+01:10:17.4 |
HIP 60062 |
23.57 |
| 2026-06-18 00:00 |
12:17:36.33 |
+01:10:09.4 |
HIP 60062 |
21.15 |
| 2026-06-18 12:00 |
12:17:46.15 |
+01:10:00.1 |
HIP 60062 |
18.70 |
| 2026-06-19 00:00 |
12:17:56.15 |
+01:09:49.5 |
HIP 60062 |
16.20 |
| 2026-06-19 12:00 |
12:18:06.30 |
+01:09:37.5 |
HIP 60062 |
13.67 |
| 2026-06-20 00:00 |
12:18:16.63 |
+01:09:24.3 |
HIP 60062 |
11.10 |
| 2026-06-20 12:00 |
12:18:27.11 |
+01:09:09.7 |
HIP 60062 |
8.50 |
| 2026-06-21 00:00 |
12:18:37.76 |
+01:08:53.9 |
HIP 60062 |
5.90 |
| 2026-06-21 12:00 |
12:18:48.56 |
+01:08:36.8 |
HIP 60062 |
3.38 |
| 2026-06-22 00:00 |
12:18:59.53 |
+01:08:18.4 |
HIP 60062 |
1.69 |