| Parameter |
Value |
| Designation |
C/2020 K4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-03-06T12:03:58.541760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:34:07Z |
| Obs used |
48 |
| NEO |
- |
| M1 |
17.900 |
| K1 |
6.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-05-20T12:49:01.488000Z |
| Discovery magnitude (MPC) |
19.78 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-06-16.0000000 |
| e |
0.96121938 |
| q (au) |
1.772742 |
| a (au) |
45.712051 |
| i (deg) |
125.914307 |
| Ω (om, deg) |
264.105134 |
| ω (w, deg) |
310.291834 |
| M (ma, deg) |
0.323677 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.090 + 2.376\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.090 |
| n |
2.376 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
13:16:53.38 |
+55:57:32.2 |
HIP 64756 |
8.93 |
| 2026-03-26 12:00 |
13:16:40.08 |
+55:58:24.3 |
HIP 64756 |
8.79 |
| 2026-03-27 00:00 |
13:16:26.76 |
+55:59:15.4 |
HIP 64756 |
9.10 |
| 2026-03-27 12:00 |
13:16:13.40 |
+56:00:05.6 |
HIP 64756 |
9.82 |
| 2026-03-28 00:00 |
13:16:00.02 |
+56:00:54.9 |
HIP 64756 |
10.88 |
| 2026-03-28 12:00 |
13:15:46.62 |
+56:01:43.3 |
HIP 64756 |
12.17 |
| 2026-03-29 00:00 |
13:15:33.18 |
+56:02:30.7 |
HIP 64756 |
13.64 |
| 2026-03-29 12:00 |
13:15:19.72 |
+56:03:17.2 |
HIP 64756 |
15.22 |
| 2026-03-30 00:00 |
13:15:06.24 |
+56:04:02.7 |
HIP 64756 |
16.90 |
| 2026-03-30 12:00 |
13:14:52.74 |
+56:04:47.3 |
HIP 64756 |
18.63 |
| 2026-03-31 00:00 |
13:14:39.22 |
+56:05:31.0 |
HIP 64756 |
20.41 |
| 2026-03-31 12:00 |
13:14:25.68 |
+56:06:13.7 |
HIP 64756 |
22.22 |
| 2026-04-01 00:00 |
13:14:12.12 |
+56:06:55.5 |
HIP 64756 |
24.05 |
| 2026-04-01 12:00 |
13:13:58.54 |
+56:07:36.3 |
HIP 64376 |
22.76 |
| 2026-04-02 00:00 |
13:13:44.95 |
+56:08:16.2 |
HIP 64376 |
21.56 |
| 2026-04-02 12:00 |
13:13:31.35 |
+56:08:55.2 |
HIP 64376 |
20.46 |
| 2026-04-03 00:00 |
13:13:17.73 |
+56:09:33.1 |
HIP 64376 |
19.51 |
| 2026-04-03 12:00 |
13:13:04.10 |
+56:10:10.2 |
HIP 64376 |
18.70 |
| 2026-04-04 00:00 |
13:12:50.45 |
+56:10:46.2 |
HIP 64376 |
18.07 |
| 2026-04-04 12:00 |
13:12:36.80 |
+56:11:21.4 |
HIP 64376 |
17.63 |
| 2026-04-05 00:00 |
13:12:23.14 |
+56:11:55.5 |
HIP 64376 |
17.40 |
| 2026-04-05 12:00 |
13:12:09.48 |
+56:12:28.7 |
HIP 64376 |
17.37 |
| 2026-04-06 00:00 |
13:11:55.81 |
+56:13:01.0 |
HIP 64376 |
17.55 |
| 2026-04-06 12:00 |
13:11:42.13 |
+56:13:32.2 |
HIP 64376 |
17.94 |
| 2026-04-07 00:00 |
13:11:28.45 |
+56:14:02.6 |
HIP 64376 |
18.52 |
| 2026-04-07 12:00 |
13:11:14.77 |
+56:14:31.9 |
HIP 64376 |
19.26 |
| 2026-04-08 00:00 |
13:11:01.09 |
+56:15:00.3 |
HIP 64376 |
20.15 |
| 2026-04-08 12:00 |
13:10:47.41 |
+56:15:27.7 |
HIP 64376 |
21.18 |
| 2026-04-09 00:00 |
13:10:33.73 |
+56:15:54.2 |
HIP 64127 |
22.03 |
| 2026-04-09 12:00 |
13:10:20.05 |
+56:16:19.6 |
HIP 64127 |
20.97 |
| 2026-04-10 00:00 |
13:10:06.38 |
+56:16:44.2 |
HIP 64127 |
20.02 |
| 2026-04-10 12:00 |
13:09:52.71 |
+56:17:07.7 |
HIP 64127 |
19.22 |
| 2026-04-11 00:00 |
13:09:39.05 |
+56:17:30.3 |
HIP 64127 |
18.57 |
| 2026-04-11 12:00 |
13:09:25.40 |
+56:17:51.9 |
HIP 64127 |
18.09 |
| 2026-04-12 00:00 |
13:09:11.75 |
+56:18:12.5 |
HIP 64127 |
17.79 |
| 2026-04-12 12:00 |
13:08:58.12 |
+56:18:32.2 |
HIP 64127 |
17.69 |
| 2026-04-13 00:00 |
13:08:44.50 |
+56:18:50.8 |
HIP 64127 |
17.78 |
| 2026-04-13 12:00 |
13:08:30.89 |
+56:19:08.6 |
HIP 64127 |
18.06 |
| 2026-04-14 00:00 |
13:08:17.30 |
+56:19:25.3 |
HIP 64127 |
18.51 |
| 2026-04-14 12:00 |
13:08:03.73 |
+56:19:41.1 |
HIP 64127 |
19.14 |
| 2026-04-15 00:00 |
13:07:50.17 |
+56:19:55.9 |
HIP 64127 |
19.91 |
| 2026-04-15 12:00 |
13:07:36.63 |
+56:20:09.7 |
HIP 64127 |
20.80 |
| 2026-04-16 00:00 |
13:07:23.10 |
+56:20:22.6 |
HIP 64127 |
21.82 |