| 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 |
1.000 |
| gb |
-0.770 |
| 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 |
01:17:27.83 |
-42:10:03.3 |
HIP 5927 |
16.95 |
| 2026-05-12 12:00 |
01:17:47.95 |
-42:09:01.9 |
HIP 5927 |
19.69 |
| 2026-05-13 00:00 |
01:18:07.93 |
-42:08:02.7 |
HIP 5972 |
21.88 |
| 2026-05-13 12:00 |
01:18:27.77 |
-42:07:05.7 |
HIP 5972 |
23.99 |
| 2026-05-14 00:00 |
01:18:47.47 |
-42:06:10.9 |
HIP 5972 |
26.48 |
| 2026-05-14 12:00 |
01:19:07.03 |
-42:05:18.4 |
HIP 5972 |
29.24 |
| 2026-05-15 00:00 |
01:19:26.45 |
-42:04:28.1 |
HIP 6214 |
29.66 |
| 2026-05-15 12:00 |
01:19:45.72 |
-42:03:40.0 |
HIP 6214 |
30.36 |
| 2026-05-16 00:00 |
01:20:04.85 |
-42:02:54.1 |
HIP 6351 |
28.80 |
| 2026-05-16 12:00 |
01:20:23.83 |
-42:02:10.4 |
HIP 6351 |
26.29 |
| 2026-05-17 00:00 |
01:20:42.66 |
-42:01:29.0 |
HIP 6351 |
24.11 |
| 2026-05-17 12:00 |
01:21:01.34 |
-42:00:49.7 |
HIP 6351 |
22.34 |
| 2026-05-18 00:00 |
01:21:19.88 |
-42:00:12.7 |
HIP 6351 |
21.05 |
| 2026-05-18 12:00 |
01:21:38.26 |
-41:59:37.8 |
HIP 6351 |
20.33 |
| 2026-05-19 00:00 |
01:21:56.50 |
-41:59:05.2 |
HIP 6351 |
20.22 |
| 2026-05-19 12:00 |
01:22:14.58 |
-41:58:34.7 |
HIP 6351 |
20.72 |
| 2026-05-20 00:00 |
01:22:32.50 |
-41:58:06.5 |
HIP 6351 |
21.76 |
| 2026-05-20 12:00 |
01:22:50.28 |
-41:57:40.4 |
HIP 6351 |
23.26 |
| 2026-05-21 00:00 |
01:23:07.89 |
-41:57:16.5 |
HIP 6351 |
25.12 |
| 2026-05-21 12:00 |
01:23:25.35 |
-41:56:54.8 |
HIP 6351 |
27.26 |
| 2026-05-22 00:00 |
01:23:42.66 |
-41:56:35.3 |
HIP 6482 |
28.57 |
| 2026-05-22 12:00 |
01:23:59.80 |
-41:56:17.9 |
HIP 6592 |
27.82 |
| 2026-05-23 00:00 |
01:24:16.79 |
-41:56:02.7 |
HIP 6592 |
26.87 |
| 2026-05-23 12:00 |
01:24:33.62 |
-41:55:49.6 |
HIP 6592 |
26.31 |
| 2026-05-24 00:00 |
01:24:50.28 |
-41:55:38.7 |
HIP 6760 |
26.13 |
| 2026-05-24 12:00 |
01:25:06.79 |
-41:55:30.0 |
HIP 6760 |
23.30 |
| 2026-05-25 00:00 |
01:25:23.13 |
-41:55:23.4 |
HIP 6760 |
20.58 |
| 2026-05-25 12:00 |
01:25:39.31 |
-41:55:18.9 |
HIP 6760 |
18.02 |
| 2026-05-26 00:00 |
01:25:55.33 |
-41:55:16.6 |
HIP 6760 |
15.66 |
| 2026-05-26 12:00 |
01:26:11.18 |
-41:55:16.4 |
HIP 6760 |
13.60 |
| 2026-05-27 00:00 |
01:26:26.86 |
-41:55:18.3 |
HIP 6760 |
11.97 |
| 2026-05-27 12:00 |
01:26:42.38 |
-41:55:22.4 |
HIP 6760 |
10.93 |
| 2026-05-28 00:00 |
01:26:57.73 |
-41:55:28.5 |
HIP 6760 |
10.63 |
| 2026-05-28 12:00 |
01:27:12.91 |
-41:55:36.8 |
HIP 6760 |
11.12 |
| 2026-05-29 00:00 |
01:27:27.93 |
-41:55:47.2 |
HIP 6760 |
12.28 |
| 2026-05-29 12:00 |
01:27:42.77 |
-41:55:59.7 |
HIP 6760 |
13.92 |
| 2026-05-30 00:00 |
01:27:57.44 |
-41:56:14.2 |
HIP 6760 |
15.88 |
| 2026-05-30 12:00 |
01:28:11.94 |
-41:56:30.9 |
HIP 6931 |
14.01 |
| 2026-05-31 00:00 |
01:28:26.27 |
-41:56:49.7 |
HIP 6931 |
11.90 |
| 2026-05-31 12:00 |
01:28:40.42 |
-41:57:10.5 |
HIP 6931 |
10.12 |
| 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 |