| Parameter |
Value |
| Designation |
C/2020 K2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-08-04T17:10:46.476480Z |
| Orbit solution date (soln_date, UTC) |
2021-07-01T22:12:49Z |
| Obs used |
87 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
9.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-05-21T13:39:44.841600Z |
| Discovery magnitude (MPC) |
20.56 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-07-25.0000000 |
| e |
1.00129323 |
| q (au) |
8.878219 |
| a (au) |
-6865.139277 |
| i (deg) |
91.035953 |
| Ω (om, deg) |
288.338902 |
| ω (w, deg) |
67.272622 |
| M (ma, deg) |
-0.000019 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.933 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.933 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
0.801 |
| δ90 |
9.160 |
| 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) |
| 2026-07-29 00:00 |
07:58:25.88 |
+53:20:24.8 |
HIP 39092 |
12.76 |
| 2026-07-29 12:00 |
07:58:36.96 |
+53:19:45.6 |
HIP 39092 |
11.27 |
| 2026-07-30 00:00 |
07:58:48.03 |
+53:19:06.9 |
HIP 39092 |
9.87 |
| 2026-07-30 12:00 |
07:58:59.06 |
+53:18:28.7 |
HIP 39092 |
8.60 |
| 2026-07-31 00:00 |
07:59:10.08 |
+53:17:51.0 |
HIP 39092 |
7.54 |
| 2026-07-31 12:00 |
07:59:21.08 |
+53:17:13.7 |
HIP 39092 |
6.76 |
| 2026-08-01 00:00 |
07:59:32.05 |
+53:16:36.9 |
HIP 39092 |
6.39 |
| 2026-08-01 12:00 |
07:59:43.00 |
+53:16:00.5 |
HIP 39092 |
6.47 |
| 2026-08-02 00:00 |
07:59:53.92 |
+53:15:24.6 |
HIP 39092 |
6.99 |
| 2026-08-02 12:00 |
08:00:04.82 |
+53:14:49.2 |
HIP 39092 |
7.87 |
| 2026-08-03 00:00 |
08:00:15.69 |
+53:14:14.2 |
HIP 39092 |
8.98 |
| 2026-08-03 12:00 |
08:00:26.54 |
+53:13:39.7 |
HIP 39092 |
10.26 |
| 2026-08-04 00:00 |
08:00:37.36 |
+53:13:05.6 |
HIP 39092 |
11.64 |
| 2026-08-04 12:00 |
08:00:48.15 |
+53:12:32.1 |
HIP 39092 |
13.10 |
| 2026-08-05 00:00 |
08:00:58.92 |
+53:11:59.0 |
HIP 39092 |
14.60 |
| 2026-08-05 12:00 |
08:01:09.66 |
+53:11:26.3 |
HIP 39092 |
16.13 |
| 2026-08-06 00:00 |
08:01:20.37 |
+53:10:54.2 |
HIP 39092 |
17.68 |
| 2026-08-06 12:00 |
08:01:31.05 |
+53:10:22.5 |
HIP 39092 |
19.25 |
| 2026-08-07 00:00 |
08:01:41.70 |
+53:09:51.3 |
HIP 39432 |
17.86 |
| 2026-08-07 12:00 |
08:01:52.32 |
+53:09:20.5 |
HIP 39432 |
16.38 |
| 2026-08-08 00:00 |
08:02:02.90 |
+53:08:50.3 |
HIP 39432 |
14.94 |
| 2026-08-08 12:00 |
08:02:13.46 |
+53:08:20.5 |
HIP 39432 |
13.56 |
| 2026-08-09 00:00 |
08:02:23.98 |
+53:07:51.2 |
HIP 39432 |
12.25 |
| 2026-08-09 12:00 |
08:02:34.47 |
+53:07:22.3 |
HIP 39432 |
11.03 |
| 2026-08-10 00:00 |
08:02:44.93 |
+53:06:53.9 |
HIP 39432 |
9.93 |
| 2026-08-10 12:00 |
08:02:55.35 |
+53:06:26.1 |
HIP 39432 |
8.99 |
| 2026-08-11 00:00 |
08:03:05.73 |
+53:05:58.6 |
HIP 39432 |
8.26 |
| 2026-08-11 12:00 |
08:03:16.08 |
+53:05:31.7 |
HIP 39432 |
7.81 |
| 2026-08-12 00:00 |
08:03:26.39 |
+53:05:05.3 |
HIP 39432 |
7.67 |
| 2026-08-12 12:00 |
08:03:36.67 |
+53:04:39.3 |
HIP 39432 |
7.85 |
| 2026-08-13 00:00 |
08:03:46.90 |
+53:04:13.8 |
HIP 39432 |
8.34 |
| 2026-08-13 12:00 |
08:03:57.10 |
+53:03:48.8 |
HIP 39432 |
9.07 |
| 2026-08-14 00:00 |
08:04:07.26 |
+53:03:24.3 |
HIP 39432 |
9.99 |
| 2026-08-14 12:00 |
08:04:17.38 |
+53:03:00.2 |
HIP 39432 |
11.05 |
| 2026-08-15 00:00 |
08:04:27.46 |
+53:02:36.6 |
HIP 39432 |
12.22 |
| 2026-08-15 12:00 |
08:04:37.49 |
+53:02:13.5 |
HIP 39432 |
13.45 |
| 2026-08-16 00:00 |
08:04:47.49 |
+53:01:50.9 |
HIP 39432 |
14.73 |
| 2026-08-16 12:00 |
08:04:57.44 |
+53:01:28.8 |
HIP 39432 |
16.05 |
| 2026-08-17 00:00 |
08:05:07.35 |
+53:01:07.2 |
HIP 39432 |
17.40 |
| 2026-08-17 12:00 |
08:05:17.21 |
+53:00:46.0 |
HIP 39432 |
18.76 |
| 2026-08-18 00:00 |
08:05:27.03 |
+53:00:25.3 |
HIP 39432 |
20.14 |
| 2026-08-18 12:00 |
08:05:36.80 |
+53:00:05.1 |
HIP 39432 |
21.53 |
| 2026-08-19 00:00 |
08:05:46.53 |
+52:59:45.4 |
HIP 39432 |
22.92 |