| 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) |
| 2026-07-29 00:00 |
12:38:52.64 |
-00:03:06.9 |
HIP 61672 |
16.94 |
| 2026-07-29 12:00 |
12:39:13.12 |
-00:04:36.6 |
HIP 61672 |
20.39 |
| 2026-07-30 00:00 |
12:39:33.69 |
-00:06:07.0 |
HIP 61672 |
24.55 |
| 2026-07-30 12:00 |
12:39:54.36 |
-00:07:38.0 |
HIP 61805 |
24.17 |
| 2026-07-31 00:00 |
12:40:15.12 |
-00:09:09.6 |
HIP 61805 |
22.91 |
| 2026-07-31 12:00 |
12:40:35.97 |
-00:10:41.9 |
HIP 61805 |
22.89 |
| 2026-08-01 00:00 |
12:40:56.92 |
-00:12:14.8 |
HIP 61992 |
21.13 |
| 2026-08-01 12:00 |
12:41:17.95 |
-00:13:48.2 |
HIP 61992 |
15.64 |
| 2026-08-02 00:00 |
12:41:39.08 |
-00:15:22.3 |
HIP 61992 |
10.13 |
| 2026-08-02 12:00 |
12:42:00.30 |
-00:16:57.0 |
HIP 61992 |
4.60 |
| 2026-08-03 00:00 |
12:42:21.61 |
-00:18:32.3 |
HIP 61992 |
0.99 |
| 2026-08-03 12:00 |
12:42:43.01 |
-00:20:08.2 |
HIP 61992 |
6.55 |
| 2026-08-04 00:00 |
12:43:04.49 |
-00:21:44.6 |
HIP 61992 |
12.16 |
| 2026-08-04 12:00 |
12:43:26.07 |
-00:23:21.6 |
HIP 61992 |
17.79 |
| 2026-08-05 00:00 |
12:43:47.73 |
-00:24:59.2 |
HIP 61992 |
23.44 |
| 2026-08-05 12:00 |
12:44:09.48 |
-00:26:37.4 |
HIP 61992 |
29.12 |
| 2026-08-06 00:00 |
12:44:31.31 |
-00:28:16.1 |
HIP 61992 |
34.82 |
| 2026-08-06 12:00 |
12:44:53.23 |
-00:29:55.3 |
HIP 62348 |
31.46 |
| 2026-08-07 00:00 |
12:45:15.24 |
-00:31:35.1 |
HIP 62348 |
26.18 |
| 2026-08-07 12:00 |
12:45:37.32 |
-00:33:15.4 |
HIP 62348 |
21.13 |
| 2026-08-08 00:00 |
12:45:59.50 |
-00:34:56.3 |
HIP 62348 |
16.54 |
| 2026-08-08 12:00 |
12:46:21.75 |
-00:36:37.6 |
HIP 62348 |
12.94 |
| 2026-08-09 00:00 |
12:46:44.09 |
-00:38:19.5 |
HIP 62348 |
11.35 |
| 2026-08-09 12:00 |
12:47:06.51 |
-00:40:01.9 |
HIP 62348 |
12.59 |
| 2026-08-10 00:00 |
12:47:29.01 |
-00:41:44.8 |
HIP 62348 |
16.04 |
| 2026-08-10 12:00 |
12:47:51.60 |
-00:43:28.2 |
HIP 62348 |
20.64 |
| 2026-08-11 00:00 |
12:48:14.26 |
-00:45:12.0 |
HIP 62468 |
23.73 |
| 2026-08-11 12:00 |
12:48:37.00 |
-00:46:56.4 |
HIP 62468 |
26.51 |
| 2026-08-12 00:00 |
12:48:59.82 |
-00:48:41.2 |
HIP 62687 |
26.07 |
| 2026-08-12 12:00 |
12:49:22.72 |
-00:50:26.5 |
HIP 62687 |
20.69 |
| 2026-08-13 00:00 |
12:49:45.69 |
-00:52:12.2 |
HIP 62687 |
15.73 |
| 2026-08-13 12:00 |
12:50:08.74 |
-00:53:58.4 |
HIP 62687 |
11.79 |
| 2026-08-14 00:00 |
12:50:31.87 |
-00:55:45.0 |
HIP 62687 |
10.15 |
| 2026-08-14 12:00 |
12:50:55.07 |
-00:57:32.1 |
HIP 62687 |
11.86 |
| 2026-08-15 00:00 |
12:51:18.34 |
-00:59:19.6 |
HIP 62808 |
13.93 |
| 2026-08-15 12:00 |
12:51:41.69 |
-01:01:07.5 |
HIP 62808 |
9.33 |
| 2026-08-16 00:00 |
12:52:05.12 |
-01:02:55.8 |
HIP 62808 |
7.40 |
| 2026-08-16 12:00 |
12:52:28.61 |
-01:04:44.5 |
HIP 62808 |
9.89 |
| 2026-08-17 00:00 |
12:52:52.17 |
-01:06:33.6 |
HIP 62808 |
14.73 |
| 2026-08-17 12:00 |
12:53:15.81 |
-01:08:23.1 |
HIP 62808 |
20.32 |
| 2026-08-18 00:00 |
12:53:39.51 |
-01:10:12.9 |
HIP 62963 |
19.46 |
| 2026-08-18 12:00 |
12:54:03.28 |
-01:12:03.2 |
HIP 62963 |
16.28 |
| 2026-08-19 00:00 |
12:54:27.13 |
-01:13:53.8 |
HIP 62963 |
15.13 |