C/2025 K3 (PANSTARRS)
| Parameter |
Value |
| Designation |
C/2025 K3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2028-12-14T03:39:21.458880Z |
| Orbit solution date (soln_date, UTC) |
2025-09-30T13:39:35Z |
| Obs used |
48 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
9.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-05-23T12:57:29.433600Z |
| Discovery magnitude (MPC) |
22.04 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2025-06-18.0000000 |
| e |
1.00147497 |
| q (au) |
3.470750 |
| a (au) |
-2353.098600 |
| i (deg) |
104.932293 |
| Ω (om, deg) |
350.615717 |
| ω (w, deg) |
188.582163 |
| M (ma, deg) |
-0.011010 |
Magnitude
Scatter + Global Linear
$$
M_a = (-0.014 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
-0.014 |
| n |
6.000 |
| gf |
0.975 |
| gb |
-0.501 |
| k |
1.000 |
| δ90 |
9.974 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
18:39:34.72 |
+46:21:26.6 |
HIP 91318 |
24.17 |
| 2026-02-03 12:00 |
18:39:45.32 |
+46:23:21.6 |
HIP 91717 |
25.12 |
| 2026-02-04 00:00 |
18:39:55.86 |
+46:25:17.9 |
HIP 91717 |
23.24 |
| 2026-02-04 12:00 |
18:40:06.32 |
+46:27:15.6 |
HIP 91717 |
21.53 |
| 2026-02-05 00:00 |
18:40:16.72 |
+46:29:14.5 |
HIP 91717 |
20.05 |
| 2026-02-05 12:00 |
18:40:27.04 |
+46:31:14.7 |
HIP 91717 |
18.86 |
| 2026-02-06 00:00 |
18:40:37.28 |
+46:33:16.2 |
HIP 91717 |
18.02 |
| 2026-02-06 12:00 |
18:40:47.46 |
+46:35:19.0 |
HIP 91717 |
17.57 |
| 2026-02-07 00:00 |
18:40:57.56 |
+46:37:23.1 |
HIP 91717 |
17.56 |
| 2026-02-07 12:00 |
18:41:07.58 |
+46:39:28.4 |
HIP 91717 |
17.99 |
| 2026-02-08 00:00 |
18:41:17.52 |
+46:41:35.1 |
HIP 91717 |
18.82 |
| 2026-02-08 12:00 |
18:41:27.38 |
+46:43:43.0 |
HIP 91702 |
18.38 |
| 2026-02-09 00:00 |
18:41:37.16 |
+46:45:52.1 |
HIP 91702 |
15.80 |
| 2026-02-09 12:00 |
18:41:46.87 |
+46:48:02.6 |
HIP 91702 |
13.27 |
| 2026-02-10 00:00 |
18:41:56.48 |
+46:50:14.2 |
HIP 91702 |
10.81 |
| 2026-02-10 12:00 |
18:42:06.02 |
+46:52:27.2 |
HIP 91702 |
8.51 |
| 2026-02-11 00:00 |
18:42:15.47 |
+46:54:41.4 |
HIP 91702 |
6.54 |
| 2026-02-11 12:00 |
18:42:24.83 |
+46:56:56.8 |
HIP 91702 |
5.30 |
| 2026-02-12 00:00 |
18:42:34.11 |
+46:59:13.5 |
HIP 91702 |
5.33 |
| 2026-02-12 12:00 |
18:42:43.30 |
+47:01:31.4 |
HIP 91702 |
6.63 |
| 2026-02-13 00:00 |
18:42:52.39 |
+47:03:50.5 |
HIP 91702 |
8.64 |
| 2026-02-13 12:00 |
18:43:01.40 |
+47:06:10.8 |
HIP 91702 |
11.00 |
| 2026-02-14 00:00 |
18:43:10.31 |
+47:08:32.4 |
HIP 91702 |
13.52 |
| 2026-02-14 12:00 |
18:43:19.13 |
+47:10:55.1 |
HIP 91702 |
16.13 |
| 2026-02-15 00:00 |
18:43:27.86 |
+47:13:19.1 |
HIP 91702 |
18.80 |
| 2026-02-15 12:00 |
18:43:36.49 |
+47:15:44.3 |
HIP 91775 |
20.31 |
| 2026-02-16 00:00 |
18:43:45.02 |
+47:18:10.6 |
HIP 91775 |
18.74 |
| 2026-02-16 12:00 |
18:43:53.46 |
+47:20:38.2 |
HIP 91887 |
16.34 |
| 2026-02-17 00:00 |
18:44:01.79 |
+47:23:06.9 |
HIP 91887 |
13.92 |
| 2026-02-17 12:00 |
18:44:10.02 |
+47:25:36.8 |
HIP 91887 |
11.67 |
| 2026-02-18 00:00 |
18:44:18.15 |
+47:28:07.8 |
HIP 91887 |
9.72 |
| 2026-02-18 12:00 |
18:44:26.18 |
+47:30:40.0 |
HIP 91887 |
8.28 |
| 2026-02-19 00:00 |
18:44:34.10 |
+47:33:13.4 |
HIP 91887 |
7.68 |
| 2026-02-19 12:00 |
18:44:41.91 |
+47:35:47.8 |
HIP 91887 |
8.10 |
| 2026-02-20 00:00 |
18:44:49.62 |
+47:38:23.5 |
HIP 91887 |
9.41 |
| 2026-02-20 12:00 |
18:44:57.22 |
+47:41:00.2 |
HIP 91887 |
11.32 |
| 2026-02-21 00:00 |
18:45:04.71 |
+47:43:38.0 |
HIP 91887 |
13.58 |
| 2026-02-21 12:00 |
18:45:12.09 |
+47:46:17.0 |
HIP 91887 |
16.05 |
| 2026-02-22 00:00 |
18:45:19.36 |
+47:48:57.0 |
HIP 91887 |
18.65 |
| 2026-02-22 12:00 |
18:45:26.51 |
+47:51:38.2 |
HIP 91887 |
21.33 |
| 2026-02-23 00:00 |
18:45:33.55 |
+47:54:20.4 |
HIP 91887 |
24.07 |
| 2026-02-23 12:00 |
18:45:40.47 |
+47:57:03.7 |
HIP 91841 |
26.69 |
| 2026-02-24 00:00 |
18:45:47.28 |
+47:59:48.1 |
HIP 92053 |
24.17 |