| 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) |
| 2026-06-01 00:00 |
01:28:54.39 |
-41:57:33.5 |
HIP 6931 |
8.83 |
| 2026-06-01 12:00 |
01:29:08.20 |
-41:57:58.5 |
HIP 6931 |
8.26 |
| 2026-06-02 00:00 |
01:29:21.82 |
-41:58:25.6 |
HIP 6931 |
8.51 |
| 2026-06-02 12:00 |
01:29:35.26 |
-41:58:54.7 |
HIP 6931 |
9.50 |
| 2026-06-03 00:00 |
01:29:48.53 |
-41:59:26.0 |
HIP 6931 |
11.02 |
| 2026-06-03 12:00 |
01:30:01.61 |
-41:59:59.3 |
HIP 6931 |
12.86 |
| 2026-06-04 00:00 |
01:30:14.52 |
-42:00:34.6 |
HIP 6931 |
14.90 |
| 2026-06-04 12:00 |
01:30:27.24 |
-42:01:12.0 |
HIP 6931 |
17.05 |
| 2026-06-05 00:00 |
01:30:39.78 |
-42:01:51.4 |
HIP 6931 |
19.26 |
| 2026-06-05 12:00 |
01:30:52.13 |
-42:02:32.9 |
HIP 6931 |
21.51 |
| 2026-06-06 00:00 |
01:31:04.30 |
-42:03:16.4 |
HIP 6931 |
23.78 |
| 2026-06-06 12:00 |
01:31:16.28 |
-42:04:02.0 |
HIP 7219 |
21.50 |
| 2026-06-07 00:00 |
01:31:28.07 |
-42:04:49.6 |
HIP 7219 |
19.20 |
| 2026-06-07 12:00 |
01:31:39.67 |
-42:05:39.2 |
HIP 7219 |
16.91 |
| 2026-06-08 00:00 |
01:31:51.08 |
-42:06:30.8 |
HIP 7219 |
14.65 |
| 2026-06-08 12:00 |
01:32:02.29 |
-42:07:24.4 |
HIP 7219 |
12.40 |
| 2026-06-09 00:00 |
01:32:13.32 |
-42:08:20.1 |
HIP 7219 |
10.18 |
| 2026-06-09 12:00 |
01:32:24.15 |
-42:09:17.7 |
HIP 7219 |
7.98 |
| 2026-06-10 00:00 |
01:32:34.78 |
-42:10:17.4 |
HIP 7219 |
5.80 |
| 2026-06-10 12:00 |
01:32:45.21 |
-42:11:19.0 |
HIP 7219 |
3.67 |
| 2026-06-11 00:00 |
01:32:55.45 |
-42:12:22.6 |
HIP 7219 |
1.67 |
| 2026-06-11 12:00 |
01:33:05.48 |
-42:13:28.2 |
HIP 7219 |
1.20 |
| 2026-06-12 00:00 |
01:33:15.32 |
-42:14:35.8 |
HIP 7219 |
3.03 |
| 2026-06-12 12:00 |
01:33:24.95 |
-42:15:45.3 |
HIP 7219 |
5.09 |
| 2026-06-13 00:00 |
01:33:34.37 |
-42:16:56.7 |
HIP 7219 |
7.16 |
| 2026-06-13 12:00 |
01:33:43.59 |
-42:18:10.2 |
HIP 7219 |
9.23 |
| 2026-06-14 00:00 |
01:33:52.60 |
-42:19:25.5 |
HIP 7219 |
11.30 |
| 2026-06-14 12:00 |
01:34:01.40 |
-42:20:42.8 |
HIP 7219 |
13.35 |
| 2026-06-15 00:00 |
01:34:09.99 |
-42:22:02.0 |
HIP 7409 |
14.98 |
| 2026-06-15 12:00 |
01:34:18.37 |
-42:23:23.0 |
HIP 7409 |
13.76 |
| 2026-06-16 00:00 |
01:34:26.54 |
-42:24:46.0 |
HIP 7409 |
12.82 |
| 2026-06-16 12:00 |
01:34:34.49 |
-42:26:10.9 |
HIP 7409 |
12.20 |
| 2026-06-17 00:00 |
01:34:42.22 |
-42:27:37.6 |
HIP 7409 |
11.95 |
| 2026-06-17 12:00 |
01:34:49.74 |
-42:29:06.2 |
HIP 7409 |
12.10 |
| 2026-06-18 00:00 |
01:34:57.03 |
-42:30:36.6 |
HIP 7409 |
12.62 |
| 2026-06-18 12:00 |
01:35:04.11 |
-42:32:08.9 |
HIP 7409 |
13.47 |
| 2026-06-19 00:00 |
01:35:10.96 |
-42:33:43.0 |
HIP 7409 |
14.60 |
| 2026-06-19 12:00 |
01:35:17.60 |
-42:35:18.8 |
HIP 7409 |
15.93 |
| 2026-06-20 00:00 |
01:35:24.01 |
-42:36:56.5 |
HIP 7409 |
17.43 |
| 2026-06-20 12:00 |
01:35:30.19 |
-42:38:36.0 |
HIP 7409 |
19.05 |
| 2026-06-21 00:00 |
01:35:36.15 |
-42:40:17.2 |
HIP 7442 |
19.99 |
| 2026-06-21 12:00 |
01:35:41.88 |
-42:42:00.1 |
HIP 7442 |
18.17 |
| 2026-06-22 00:00 |
01:35:47.38 |
-42:43:44.9 |
HIP 7442 |
16.36 |