| Parameter |
Value |
| Designation |
C/2025 D5 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-05-13T06:52:41.522880Z |
| Orbit solution date (soln_date, UTC) |
2025-04-11T14:45:07Z |
| Obs used |
29 |
| NEO |
- |
| M1 |
19.300 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-02-28T13:02:06.604800Z |
| Discovery magnitude (MPC) |
20.67 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2025-03-05.0000000 |
| e |
0.99937857 |
| q (au) |
2.012182 |
| a (au) |
3237.980838 |
| i (deg) |
73.381837 |
| Ω (om, deg) |
0.738132 |
| ω (w, deg) |
211.490104 |
| M (ma, deg) |
359.999629 |
Magnitude
Scatter + Global Linear
$$
M_a = (18.263 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
18.263 |
| n |
2.000 |
| gf |
0.979 |
| gb |
-0.502 |
| k |
1.000 |
| δ90 |
9.991 |
| 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 |
01:30:32.12 |
-45:53:22.1 |
HIP 7115 |
22.15 |
| 2026-07-29 12:00 |
01:30:17.05 |
-45:56:23.2 |
HIP 7176 |
25.90 |
| 2026-07-30 00:00 |
01:30:01.67 |
-45:59:24.4 |
HIP 7072 |
26.79 |
| 2026-07-30 12:00 |
01:29:45.99 |
-46:02:25.5 |
HIP 6806 |
23.63 |
| 2026-07-31 00:00 |
01:29:30.00 |
-46:05:26.6 |
HIP 6806 |
20.22 |
| 2026-07-31 12:00 |
01:29:13.71 |
-46:08:27.5 |
HIP 6806 |
17.07 |
| 2026-08-01 00:00 |
01:28:57.12 |
-46:11:28.4 |
HIP 6806 |
14.37 |
| 2026-08-01 12:00 |
01:28:40.21 |
-46:14:29.1 |
HIP 6806 |
12.47 |
| 2026-08-02 00:00 |
01:28:23.00 |
-46:17:29.7 |
HIP 6806 |
11.78 |
| 2026-08-02 12:00 |
01:28:05.49 |
-46:20:30.0 |
HIP 6806 |
12.54 |
| 2026-08-03 00:00 |
01:27:47.67 |
-46:23:30.0 |
HIP 6806 |
14.56 |
| 2026-08-03 12:00 |
01:27:29.54 |
-46:26:29.8 |
HIP 6806 |
17.42 |
| 2026-08-04 00:00 |
01:27:11.11 |
-46:29:29.3 |
HIP 6806 |
20.81 |
| 2026-08-04 12:00 |
01:26:52.37 |
-46:32:28.4 |
HIP 6806 |
24.52 |
| 2026-08-05 00:00 |
01:26:33.32 |
-46:35:27.1 |
HIP 6806 |
28.43 |
| 2026-08-05 12:00 |
01:26:13.98 |
-46:38:25.4 |
HIP 6806 |
32.50 |
| 2026-08-06 00:00 |
01:25:54.32 |
-46:41:23.3 |
HIP 6806 |
36.67 |
| 2026-08-06 12:00 |
01:25:34.37 |
-46:44:20.6 |
HIP 6365 |
39.25 |
| 2026-08-07 00:00 |
01:25:14.10 |
-46:47:17.4 |
HIP 6365 |
36.01 |
| 2026-08-07 12:00 |
01:24:53.54 |
-46:50:13.7 |
HIP 6365 |
33.03 |
| 2026-08-08 00:00 |
01:24:32.67 |
-46:53:09.3 |
HIP 6365 |
30.41 |
| 2026-08-08 12:00 |
01:24:11.50 |
-46:56:04.3 |
HIP 6365 |
28.26 |
| 2026-08-09 00:00 |
01:23:50.03 |
-46:58:58.6 |
HIP 6415 |
23.87 |
| 2026-08-09 12:00 |
01:23:28.26 |
-47:01:52.2 |
HIP 6415 |
19.33 |
| 2026-08-10 00:00 |
01:23:06.18 |
-47:04:45.1 |
HIP 6415 |
14.88 |
| 2026-08-10 12:00 |
01:22:43.81 |
-47:07:37.1 |
HIP 6415 |
10.68 |
| 2026-08-11 00:00 |
01:22:21.14 |
-47:10:28.3 |
HIP 6415 |
7.22 |
| 2026-08-11 12:00 |
01:21:58.17 |
-47:13:18.6 |
HIP 6415 |
6.06 |
| 2026-08-12 00:00 |
01:21:34.91 |
-47:16:08.1 |
HIP 6415 |
8.28 |
| 2026-08-12 12:00 |
01:21:11.36 |
-47:18:56.5 |
HIP 6415 |
12.18 |
| 2026-08-13 00:00 |
01:20:47.51 |
-47:21:44.0 |
HIP 6322 |
10.81 |
| 2026-08-13 12:00 |
01:20:23.37 |
-47:24:30.4 |
HIP 6322 |
10.77 |
| 2026-08-14 00:00 |
01:19:58.94 |
-47:27:15.7 |
HIP 6207 |
10.60 |
| 2026-08-14 12:00 |
01:19:34.22 |
-47:30:00.0 |
HIP 6207 |
12.46 |
| 2026-08-15 00:00 |
01:19:09.21 |
-47:32:43.0 |
HIP 6207 |
15.75 |
| 2026-08-15 12:00 |
01:18:43.93 |
-47:35:24.9 |
HIP 6207 |
19.78 |
| 2026-08-16 00:00 |
01:18:18.36 |
-47:38:05.6 |
HIP 6207 |
24.20 |
| 2026-08-16 12:00 |
01:17:52.51 |
-47:40:45.0 |
HIP 6075 |
28.31 |
| 2026-08-17 00:00 |
01:17:26.38 |
-47:43:23.1 |
HIP 6075 |
26.23 |
| 2026-08-17 12:00 |
01:16:59.97 |
-47:45:59.8 |
HIP 6075 |
25.08 |
| 2026-08-18 00:00 |
01:16:33.30 |
-47:48:35.2 |
HIP 6075 |
24.99 |
| 2026-08-18 12:00 |
01:16:06.35 |
-47:51:09.1 |
HIP 6075 |
26.00 |
| 2026-08-19 00:00 |
01:15:39.13 |
-47:53:41.6 |
HIP 5809 |
24.15 |