C/2020 K4 (PANSTARRS)
| 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) |
| 2026-02-03 00:00 |
13:33:38.34 |
+53:26:09.8 |
HIP 66154 |
3.14 |
| 2026-02-03 12:00 |
13:33:33.16 |
+53:28:01.6 |
HIP 66154 |
5.05 |
| 2026-02-04 00:00 |
13:33:27.88 |
+53:29:53.2 |
HIP 66154 |
7.02 |
| 2026-02-04 12:00 |
13:33:22.49 |
+53:31:44.7 |
HIP 66154 |
9.01 |
| 2026-02-05 00:00 |
13:33:16.99 |
+53:33:36.0 |
HIP 66154 |
11.01 |
| 2026-02-05 12:00 |
13:33:11.39 |
+53:35:27.2 |
HIP 66192 |
11.23 |
| 2026-02-06 00:00 |
13:33:05.68 |
+53:37:18.2 |
HIP 66192 |
10.60 |
| 2026-02-06 12:00 |
13:32:59.86 |
+53:39:08.9 |
HIP 66192 |
10.36 |
| 2026-02-07 00:00 |
13:32:53.93 |
+53:40:59.5 |
HIP 66192 |
10.53 |
| 2026-02-07 12:00 |
13:32:47.90 |
+53:42:49.9 |
HIP 66192 |
11.09 |
| 2026-02-08 00:00 |
13:32:41.77 |
+53:44:40.0 |
HIP 66192 |
11.99 |
| 2026-02-08 12:00 |
13:32:35.53 |
+53:46:30.0 |
HIP 66049 |
11.26 |
| 2026-02-09 00:00 |
13:32:29.18 |
+53:48:19.6 |
HIP 66049 |
9.41 |
| 2026-02-09 12:00 |
13:32:22.73 |
+53:50:09.1 |
HIP 66049 |
7.66 |
| 2026-02-10 00:00 |
13:32:16.17 |
+53:51:58.2 |
HIP 66049 |
6.12 |
| 2026-02-10 12:00 |
13:32:09.51 |
+53:53:47.1 |
HIP 66049 |
4.99 |
| 2026-02-11 00:00 |
13:32:02.74 |
+53:55:35.7 |
HIP 66049 |
4.57 |
| 2026-02-11 12:00 |
13:31:55.87 |
+53:57:24.1 |
HIP 66049 |
5.06 |
| 2026-02-12 00:00 |
13:31:48.89 |
+53:59:12.1 |
HIP 66049 |
6.25 |
| 2026-02-12 12:00 |
13:31:41.81 |
+54:00:59.8 |
HIP 66049 |
7.83 |
| 2026-02-13 00:00 |
13:31:34.63 |
+54:02:47.2 |
HIP 66049 |
9.61 |
| 2026-02-13 12:00 |
13:31:27.34 |
+54:04:34.3 |
HIP 66049 |
11.49 |
| 2026-02-14 00:00 |
13:31:19.95 |
+54:06:21.1 |
HIP 66049 |
13.44 |
| 2026-02-14 12:00 |
13:31:12.46 |
+54:08:07.4 |
HIP 66049 |
15.44 |
| 2026-02-15 00:00 |
13:31:04.87 |
+54:09:53.5 |
HIP 66049 |
17.46 |
| 2026-02-15 12:00 |
13:30:57.17 |
+54:11:39.1 |
HIP 66049 |
19.49 |
| 2026-02-16 00:00 |
13:30:49.37 |
+54:13:24.4 |
HIP 66049 |
21.55 |
| 2026-02-16 12:00 |
13:30:41.47 |
+54:15:09.3 |
HIP 66049 |
23.61 |
| 2026-02-17 00:00 |
13:30:33.48 |
+54:16:53.8 |
HIP 66049 |
25.69 |
| 2026-02-17 12:00 |
13:30:25.38 |
+54:18:37.9 |
HIP 66049 |
27.77 |
| 2026-02-18 00:00 |
13:30:17.18 |
+54:20:21.6 |
HIP 66049 |
29.86 |
| 2026-02-18 12:00 |
13:30:08.88 |
+54:22:04.8 |
HIP 66049 |
31.95 |
| 2026-02-19 00:00 |
13:30:00.49 |
+54:23:47.6 |
HIP 65960 |
33.88 |
| 2026-02-19 12:00 |
13:29:51.99 |
+54:25:30.0 |
HIP 65960 |
32.79 |
| 2026-02-20 00:00 |
13:29:43.40 |
+54:27:11.9 |
HIP 65960 |
31.81 |
| 2026-02-20 12:00 |
13:29:34.72 |
+54:28:53.3 |
HIP 65960 |
30.97 |
| 2026-02-21 00:00 |
13:29:25.94 |
+54:30:34.3 |
HIP 65960 |
30.25 |
| 2026-02-21 12:00 |
13:29:17.06 |
+54:32:14.8 |
HIP 65960 |
29.69 |
| 2026-02-22 00:00 |
13:29:08.08 |
+54:33:54.8 |
HIP 65960 |
29.28 |
| 2026-02-22 12:00 |
13:28:59.02 |
+54:35:34.2 |
HIP 65960 |
29.03 |
| 2026-02-23 00:00 |
13:28:49.86 |
+54:37:13.2 |
HIP 65960 |
28.95 |
| 2026-02-23 12:00 |
13:28:40.61 |
+54:38:51.6 |
HIP 65960 |
29.04 |
| 2026-02-24 00:00 |
13:28:31.26 |
+54:40:29.6 |
HIP 65960 |
29.30 |