| Parameter |
Value |
| Designation |
C/2020 K8 (Catalina-ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-09-14T12:27:51.762240Z |
| Orbit solution date (soln_date, UTC) |
2021-05-31T22:42:54Z |
| Obs used |
291 |
| NEO |
- |
| M1 |
16.800 |
| K1 |
4.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-05-25T10:25:18.336000Z |
| Discovery magnitude (MPC) |
19.30 G |
| Discovery observatory (MPC) |
703 · University of Arizona Catalina Sky Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-07-13.0000000 |
| e |
1.00015223 |
| q (au) |
0.474575 |
| a (au) |
-3117.411049 |
| i (deg) |
31.413950 |
| Ω (om, deg) |
181.516792 |
| ω (w, deg) |
260.064417 |
| M (ma, deg) |
-0.000360 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.114 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.114 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.706 |
| k |
0.800 |
| 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) |
| 2026-07-29 00:00 |
15:57:40.90 |
+07:54:18.4 |
HIP 78128 |
10.38 |
| 2026-07-29 12:00 |
15:57:38.57 |
+07:53:43.0 |
HIP 78128 |
9.55 |
| 2026-07-30 00:00 |
15:57:36.29 |
+07:53:07.3 |
HIP 78128 |
8.73 |
| 2026-07-30 12:00 |
15:57:34.07 |
+07:52:31.3 |
HIP 78128 |
7.92 |
| 2026-07-31 00:00 |
15:57:31.90 |
+07:51:55.0 |
HIP 78128 |
7.11 |
| 2026-07-31 12:00 |
15:57:29.78 |
+07:51:18.5 |
HIP 78128 |
6.30 |
| 2026-08-01 00:00 |
15:57:27.71 |
+07:50:41.8 |
HIP 78128 |
5.51 |
| 2026-08-01 12:00 |
15:57:25.70 |
+07:50:04.8 |
HIP 78128 |
4.72 |
| 2026-08-02 00:00 |
15:57:23.74 |
+07:49:27.5 |
HIP 78128 |
3.93 |
| 2026-08-02 12:00 |
15:57:21.83 |
+07:48:50.0 |
HIP 78128 |
3.16 |
| 2026-08-03 00:00 |
15:57:19.98 |
+07:48:12.3 |
HIP 78128 |
2.40 |
| 2026-08-03 12:00 |
15:57:18.18 |
+07:47:34.3 |
HIP 78128 |
1.66 |
| 2026-08-04 00:00 |
15:57:16.43 |
+07:46:56.0 |
HIP 78128 |
0.99 |
| 2026-08-04 12:00 |
15:57:14.74 |
+07:46:17.6 |
HIP 78128 |
0.65 |
| 2026-08-05 00:00 |
15:57:13.10 |
+07:45:38.9 |
HIP 78128 |
1.02 |
| 2026-08-05 12:00 |
15:57:11.52 |
+07:45:00.0 |
HIP 78128 |
1.68 |
| 2026-08-06 00:00 |
15:57:09.99 |
+07:44:20.8 |
HIP 78128 |
2.40 |
| 2026-08-06 12:00 |
15:57:08.51 |
+07:43:41.4 |
HIP 78128 |
3.14 |
| 2026-08-07 00:00 |
15:57:07.09 |
+07:43:01.8 |
HIP 78128 |
3.88 |
| 2026-08-07 12:00 |
15:57:05.73 |
+07:42:22.0 |
HIP 78128 |
4.62 |
| 2026-08-08 00:00 |
15:57:04.41 |
+07:41:42.0 |
HIP 78128 |
5.36 |
| 2026-08-08 12:00 |
15:57:03.16 |
+07:41:01.7 |
HIP 78128 |
6.10 |
| 2026-08-09 00:00 |
15:57:01.95 |
+07:40:21.3 |
HIP 78128 |
6.83 |
| 2026-08-09 12:00 |
15:57:00.80 |
+07:39:40.6 |
HIP 78128 |
7.57 |
| 2026-08-10 00:00 |
15:56:59.71 |
+07:38:59.8 |
HIP 78128 |
8.30 |
| 2026-08-10 12:00 |
15:56:58.67 |
+07:38:18.7 |
HIP 78128 |
9.03 |
| 2026-08-11 00:00 |
15:56:57.69 |
+07:37:37.4 |
HIP 78128 |
9.76 |
| 2026-08-11 12:00 |
15:56:56.76 |
+07:36:56.0 |
HIP 78128 |
10.49 |
| 2026-08-12 00:00 |
15:56:55.89 |
+07:36:14.4 |
HIP 78128 |
11.21 |
| 2026-08-12 12:00 |
15:56:55.07 |
+07:35:32.6 |
HIP 78128 |
11.93 |
| 2026-08-13 00:00 |
15:56:54.30 |
+07:34:50.6 |
HIP 78128 |
12.66 |
| 2026-08-13 12:00 |
15:56:53.59 |
+07:34:08.4 |
HIP 78128 |
13.38 |
| 2026-08-14 00:00 |
15:56:52.94 |
+07:33:26.0 |
HIP 78128 |
14.09 |
| 2026-08-14 12:00 |
15:56:52.34 |
+07:32:43.5 |
HIP 78128 |
14.81 |
| 2026-08-15 00:00 |
15:56:51.80 |
+07:32:00.8 |
HIP 78128 |
15.53 |
| 2026-08-15 12:00 |
15:56:51.31 |
+07:31:18.0 |
HIP 78128 |
16.24 |
| 2026-08-16 00:00 |
15:56:50.87 |
+07:30:35.0 |
HIP 78128 |
16.95 |
| 2026-08-16 12:00 |
15:56:50.50 |
+07:29:51.8 |
HIP 78128 |
17.67 |
| 2026-08-17 00:00 |
15:56:50.17 |
+07:29:08.5 |
HIP 78128 |
18.38 |
| 2026-08-17 12:00 |
15:56:49.90 |
+07:28:25.1 |
HIP 78128 |
19.09 |
| 2026-08-18 00:00 |
15:56:49.69 |
+07:27:41.5 |
HIP 78128 |
19.80 |
| 2026-08-18 12:00 |
15:56:49.53 |
+07:26:57.7 |
HIP 78128 |
20.51 |
| 2026-08-19 00:00 |
15:56:49.42 |
+07:26:13.8 |
HIP 78128 |
21.22 |