| Parameter |
Value |
| Designation |
C/2025 K3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2028-12-14T01:27:26.544960Z |
| Orbit solution date (soln_date, UTC) |
2026-05-28T12:12:15Z |
| Obs used |
65 |
| 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) |
2025-09-13.0000000 |
| e |
1.00151404 |
| q (au) |
3.470134 |
| a (au) |
-2291.966545 |
| i (deg) |
104.934027 |
| Ω (om, deg) |
350.625465 |
| ω (w, deg) |
188.589708 |
| M (ma, deg) |
-0.010672 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.103 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.103 |
| n |
6.000 |
| gf |
0.872 |
| gb |
-0.888 |
| k |
0.839 |
| δ90 |
7.230 |
| 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) |
| 2026-06-01 00:00 |
18:08:32.83 |
+58:05:23.5 |
HIP 88877 |
6.66 |
| 2026-06-01 12:00 |
18:07:59.78 |
+58:07:04.4 |
HIP 88877 |
9.77 |
| 2026-06-02 00:00 |
18:07:26.56 |
+58:08:43.2 |
HIP 88877 |
13.79 |
| 2026-06-02 12:00 |
18:06:53.17 |
+58:10:19.9 |
HIP 88877 |
18.13 |
| 2026-06-03 00:00 |
18:06:19.63 |
+58:11:54.4 |
HIP 88877 |
22.60 |
| 2026-06-03 12:00 |
18:05:45.93 |
+58:13:26.8 |
HIP 88877 |
27.15 |
| 2026-06-04 00:00 |
18:05:12.08 |
+58:14:57.0 |
HIP 88476 |
30.20 |
| 2026-06-04 12:00 |
18:04:38.07 |
+58:16:25.0 |
HIP 88349 |
26.97 |
| 2026-06-05 00:00 |
18:04:03.92 |
+58:17:50.9 |
HIP 88349 |
23.23 |
| 2026-06-05 12:00 |
18:03:29.63 |
+58:19:14.5 |
HIP 88349 |
19.94 |
| 2026-06-06 00:00 |
18:02:55.19 |
+58:20:35.9 |
HIP 88349 |
17.33 |
| 2026-06-06 12:00 |
18:02:20.62 |
+58:21:55.1 |
HIP 88349 |
15.77 |
| 2026-06-07 00:00 |
18:01:45.91 |
+58:23:12.0 |
HIP 88349 |
15.58 |
| 2026-06-07 12:00 |
18:01:11.07 |
+58:24:26.7 |
HIP 88349 |
16.80 |
| 2026-06-08 00:00 |
18:00:36.10 |
+58:25:39.1 |
HIP 88349 |
19.17 |
| 2026-06-08 12:00 |
18:00:01.01 |
+58:26:49.2 |
HIP 88349 |
22.33 |
| 2026-06-09 00:00 |
17:59:25.80 |
+58:27:57.0 |
HIP 88349 |
26.00 |
| 2026-06-09 12:00 |
17:58:50.47 |
+58:29:02.5 |
HIP 87820 |
25.03 |
| 2026-06-10 00:00 |
17:58:15.03 |
+58:30:05.7 |
HIP 87820 |
22.43 |
| 2026-06-10 12:00 |
17:57:39.48 |
+58:31:06.5 |
HIP 87820 |
20.58 |
| 2026-06-11 00:00 |
17:57:03.82 |
+58:32:05.0 |
HIP 87820 |
19.70 |
| 2026-06-11 12:00 |
17:56:28.06 |
+58:33:01.1 |
HIP 87716 |
16.02 |
| 2026-06-12 00:00 |
17:55:52.20 |
+58:33:54.9 |
HIP 87716 |
12.51 |
| 2026-06-12 12:00 |
17:55:16.25 |
+58:34:46.3 |
HIP 87716 |
10.11 |
| 2026-06-13 00:00 |
17:54:40.21 |
+58:35:35.3 |
HIP 87716 |
9.69 |
| 2026-06-13 12:00 |
17:54:04.08 |
+58:36:21.9 |
HIP 87716 |
11.47 |
| 2026-06-14 00:00 |
17:53:27.87 |
+58:37:06.1 |
HIP 87716 |
14.68 |
| 2026-06-14 12:00 |
17:52:51.58 |
+58:37:47.9 |
HIP 87716 |
18.59 |
| 2026-06-15 00:00 |
17:52:15.21 |
+58:38:27.2 |
HIP 87716 |
22.85 |
| 2026-06-15 12:00 |
17:51:38.78 |
+58:39:04.1 |
HIP 87310 |
21.79 |
| 2026-06-16 00:00 |
17:51:02.28 |
+58:39:38.6 |
HIP 87310 |
20.69 |
| 2026-06-16 12:00 |
17:50:25.71 |
+58:40:10.7 |
HIP 87310 |
20.62 |
| 2026-06-17 00:00 |
17:49:49.10 |
+58:40:40.3 |
HIP 87310 |
21.62 |
| 2026-06-17 12:00 |
17:49:12.42 |
+58:41:07.4 |
HIP 87020 |
18.51 |
| 2026-06-18 00:00 |
17:48:35.70 |
+58:41:32.1 |
HIP 87020 |
13.90 |
| 2026-06-18 12:00 |
17:47:58.94 |
+58:41:54.4 |
HIP 87020 |
9.45 |
| 2026-06-19 00:00 |
17:47:22.14 |
+58:42:14.2 |
HIP 87020 |
5.57 |
| 2026-06-19 12:00 |
17:46:45.29 |
+58:42:31.5 |
HIP 87020 |
4.28 |
| 2026-06-20 00:00 |
17:46:08.42 |
+58:42:46.3 |
HIP 87020 |
7.17 |
| 2026-06-20 12:00 |
17:45:31.52 |
+58:42:58.7 |
HIP 87020 |
11.41 |
| 2026-06-21 00:00 |
17:44:54.60 |
+58:43:08.6 |
HIP 87020 |
15.96 |
| 2026-06-21 12:00 |
17:44:17.66 |
+58:43:16.0 |
HIP 87020 |
20.62 |
| 2026-06-22 00:00 |
17:43:40.71 |
+58:43:21.0 |
HIP 87020 |
25.32 |