| Parameter |
Value |
| Designation |
143P/Kowal-Mrkos |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-05-07T09:49:07.968000Z |
| Orbit solution date (soln_date, UTC) |
2026-08-07T12:42:19Z |
| Obs used |
1485 |
| NEO |
- |
| M1 |
14.500 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-04-05.0000000 |
| e |
0.40992965 |
| q (au) |
2.533920 |
| a (au) |
4.294268 |
| i (deg) |
4.694495 |
| Ω (om, deg) |
245.305598 |
| ω (w, deg) |
320.837100 |
| M (ma, deg) |
275.558012 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.422 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.422 |
| n |
2.000 |
| gf |
0.836 |
| gb |
-0.815 |
| k |
0.995 |
| δ90 |
1.000 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
11:08:29.29 |
+01:12:58.7 |
HIP 54502 |
24.12 |
| 2026-09-20 12:00 |
11:09:14.32 |
+01:08:16.6 |
HIP 54633 |
25.37 |
| 2026-09-21 00:00 |
11:09:59.34 |
+01:03:34.1 |
HIP 54633 |
15.40 |
| 2026-09-21 12:00 |
11:10:44.36 |
+00:58:51.4 |
HIP 54633 |
11.33 |
| 2026-09-22 00:00 |
11:11:29.37 |
+00:54:08.4 |
HIP 54633 |
17.81 |
| 2026-09-22 12:00 |
11:12:14.38 |
+00:49:25.1 |
HIP 54633 |
28.36 |
| 2026-09-23 00:00 |
11:12:59.38 |
+00:44:41.6 |
HIP 54889 |
21.91 |
| 2026-09-23 12:00 |
11:13:44.38 |
+00:39:57.7 |
HIP 54889 |
15.98 |
| 2026-09-24 00:00 |
11:14:29.36 |
+00:35:13.7 |
HIP 54994 |
16.82 |
| 2026-09-24 12:00 |
11:15:14.34 |
+00:30:29.3 |
HIP 54994 |
6.80 |
| 2026-09-25 00:00 |
11:15:59.32 |
+00:25:44.8 |
HIP 54994 |
10.36 |
| 2026-09-25 12:00 |
11:16:44.29 |
+00:21:00.0 |
HIP 54994 |
21.59 |
| 2026-09-26 00:00 |
11:17:29.25 |
+00:16:14.9 |
HIP 55023 |
32.57 |
| 2026-09-26 12:00 |
11:18:14.20 |
+00:11:29.6 |
HIP 55304 |
30.09 |
| 2026-09-27 00:00 |
11:18:59.15 |
+00:06:44.0 |
HIP 55304 |
19.89 |
| 2026-09-27 12:00 |
11:19:44.09 |
+00:01:58.3 |
HIP 55304 |
13.54 |
| 2026-09-28 00:00 |
11:20:29.02 |
-00:02:47.7 |
HIP 55304 |
16.39 |
| 2026-09-28 12:00 |
11:21:13.94 |
-00:07:33.9 |
HIP 55496 |
15.20 |
| 2026-09-29 00:00 |
11:21:58.85 |
-00:12:20.3 |
HIP 55495 |
13.42 |
| 2026-09-29 12:00 |
11:22:43.76 |
-00:17:06.9 |
HIP 55495 |
14.65 |
| 2026-09-30 00:00 |
11:23:28.66 |
-00:21:53.7 |
HIP 55495 |
23.38 |
| 2026-09-30 12:00 |
11:24:13.55 |
-00:26:40.7 |
HIP 55495 |
34.30 |
| 2026-10-01 00:00 |
11:24:58.43 |
-00:31:27.9 |
HIP 55800 |
36.57 |
| 2026-10-01 12:00 |
11:25:43.31 |
-00:36:15.2 |
HIP 55800 |
28.73 |
| 2026-10-02 00:00 |
11:26:28.17 |
-00:41:02.8 |
HIP 55800 |
24.72 |
| 2026-10-02 12:00 |
11:27:13.02 |
-00:45:50.5 |
HIP 55960 |
14.96 |
| 2026-10-03 00:00 |
11:27:57.87 |
-00:50:38.4 |
HIP 55960 |
3.53 |
| 2026-10-03 12:00 |
11:28:42.70 |
-00:55:26.4 |
HIP 55960 |
9.91 |
| 2026-10-04 00:00 |
11:29:27.53 |
-01:00:14.6 |
HIP 56061 |
9.34 |
| 2026-10-04 12:00 |
11:30:12.34 |
-01:05:03.0 |
HIP 56061 |
18.53 |
| 2026-10-05 00:00 |
11:30:57.15 |
-01:09:51.5 |
HIP 56061 |
29.95 |
| 2026-10-05 12:00 |
11:31:41.94 |
-01:14:40.1 |
HIP 56263 |
32.58 |
| 2026-10-06 00:00 |
11:32:26.72 |
-01:19:28.8 |
HIP 56263 |
28.27 |
| 2026-10-06 12:00 |
11:33:11.49 |
-01:24:17.7 |
HIP 56263 |
28.87 |
| 2026-10-07 00:00 |
11:33:56.24 |
-01:29:06.7 |
HIP 56263 |
34.12 |
| 2026-10-07 12:00 |
11:34:40.98 |
-01:33:55.8 |
HIP 56493 |
39.99 |
| 2026-10-08 00:00 |
11:35:25.71 |
-01:38:45.0 |
HIP 56691 |
31.81 |
| 2026-10-08 12:00 |
11:36:10.43 |
-01:43:34.2 |
HIP 56691 |
24.00 |
| 2026-10-09 00:00 |
11:36:55.13 |
-01:48:23.6 |
HIP 56738 |
20.27 |
| 2026-10-09 12:00 |
11:37:39.81 |
-01:53:13.0 |
HIP 56738 |
17.91 |
| 2026-10-10 00:00 |
11:38:24.48 |
-01:58:02.5 |
HIP 56738 |
22.94 |
| 2026-10-10 12:00 |
11:39:09.14 |
-02:02:52.1 |
HIP 56952 |
23.86 |
| 2026-10-11 00:00 |
11:39:53.77 |
-02:07:41.7 |
HIP 56952 |
19.67 |