| Parameter |
Value |
| Designation |
143P/Kowal-Mrkos |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-05-07T09:52:37.738560Z |
| Orbit solution date (soln_date, UTC) |
2026-05-08T13:42:12Z |
| Obs used |
1480 |
| NEO |
- |
| M1 |
14.500 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-03-26.0000000 |
| e |
0.40992247 |
| q (au) |
2.533972 |
| a (au) |
4.294304 |
| i (deg) |
4.694457 |
| Ω (om, deg) |
245.305500 |
| ω (w, deg) |
320.835954 |
| M (ma, deg) |
274.451247 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.189 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.189 |
| n |
2.000 |
| gf |
0.925 |
| gb |
-0.856 |
| k |
0.998 |
| 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) |
| 2026-05-12 00:00 |
08:08:06.73 |
+15:08:32.6 |
HIP 39708 |
16.40 |
| 2026-05-12 12:00 |
08:08:37.46 |
+15:07:23.1 |
HIP 39837 |
16.57 |
| 2026-05-13 00:00 |
08:09:08.35 |
+15:06:12.6 |
HIP 39837 |
18.64 |
| 2026-05-13 12:00 |
08:09:39.40 |
+15:05:01.2 |
HIP 39837 |
23.14 |
| 2026-05-14 00:00 |
08:10:10.62 |
+15:03:48.7 |
HIP 40058 |
28.53 |
| 2026-05-14 12:00 |
08:10:41.99 |
+15:02:35.2 |
HIP 40058 |
25.15 |
| 2026-05-15 00:00 |
08:11:13.53 |
+15:01:20.7 |
HIP 40058 |
23.84 |
| 2026-05-15 12:00 |
08:11:45.22 |
+15:00:05.1 |
HIP 40058 |
24.97 |
| 2026-05-16 00:00 |
08:12:17.07 |
+14:58:48.6 |
HIP 40194 |
24.00 |
| 2026-05-16 12:00 |
08:12:49.07 |
+14:57:31.0 |
HIP 40194 |
22.42 |
| 2026-05-17 00:00 |
08:13:21.23 |
+14:56:12.4 |
HIP 40194 |
23.51 |
| 2026-05-17 12:00 |
08:13:53.55 |
+14:54:52.8 |
HIP 40420 |
19.51 |
| 2026-05-18 00:00 |
08:14:26.01 |
+14:53:32.2 |
HIP 40420 |
13.49 |
| 2026-05-18 12:00 |
08:14:58.62 |
+14:52:10.5 |
HIP 40420 |
10.50 |
| 2026-05-19 00:00 |
08:15:31.38 |
+14:50:47.9 |
HIP 40420 |
12.92 |
| 2026-05-19 12:00 |
08:16:04.29 |
+14:49:24.2 |
HIP 40420 |
18.82 |
| 2026-05-20 00:00 |
08:16:37.34 |
+14:47:59.4 |
HIP 40525 |
23.35 |
| 2026-05-20 12:00 |
08:17:10.53 |
+14:46:33.7 |
HIP 40525 |
23.96 |
| 2026-05-21 00:00 |
08:17:43.87 |
+14:45:06.9 |
HIP 40759 |
26.68 |
| 2026-05-21 12:00 |
08:18:17.35 |
+14:43:39.1 |
HIP 40759 |
21.96 |
| 2026-05-22 00:00 |
08:18:50.97 |
+14:42:10.3 |
HIP 40759 |
19.70 |
| 2026-05-22 12:00 |
08:19:24.72 |
+14:40:40.4 |
HIP 40759 |
20.76 |
| 2026-05-23 00:00 |
08:19:58.61 |
+14:39:09.5 |
HIP 40759 |
24.76 |
| 2026-05-23 12:00 |
08:20:32.64 |
+14:37:37.6 |
HIP 40995 |
22.13 |
| 2026-05-24 00:00 |
08:21:06.80 |
+14:36:04.7 |
HIP 40995 |
15.77 |
| 2026-05-24 12:00 |
08:21:41.10 |
+14:34:30.7 |
HIP 40995 |
12.22 |
| 2026-05-25 00:00 |
08:22:15.52 |
+14:32:55.7 |
HIP 40995 |
13.89 |
| 2026-05-25 12:00 |
08:22:50.07 |
+14:31:19.7 |
HIP 40982 |
19.26 |
| 2026-05-26 00:00 |
08:23:24.75 |
+14:29:42.7 |
HIP 40982 |
25.60 |
| 2026-05-26 12:00 |
08:23:59.56 |
+14:28:04.6 |
HIP 41197 |
21.92 |
| 2026-05-27 00:00 |
08:24:34.50 |
+14:26:25.6 |
HIP 41197 |
19.64 |
| 2026-05-27 12:00 |
08:25:09.56 |
+14:24:45.5 |
HIP 41197 |
20.96 |
| 2026-05-28 00:00 |
08:25:44.74 |
+14:23:04.3 |
HIP 41197 |
25.38 |
| 2026-05-28 12:00 |
08:26:20.05 |
+14:21:22.2 |
HIP 41421 |
29.28 |
| 2026-05-29 00:00 |
08:26:55.48 |
+14:19:39.0 |
HIP 41578 |
25.65 |
| 2026-05-29 12:00 |
08:27:31.03 |
+14:17:54.8 |
HIP 41578 |
16.91 |
| 2026-05-30 00:00 |
08:28:06.69 |
+14:16:09.6 |
HIP 41578 |
8.22 |
| 2026-05-30 12:00 |
08:28:42.48 |
+14:14:23.3 |
HIP 41578 |
2.14 |
| 2026-05-31 00:00 |
08:29:18.38 |
+14:12:36.1 |
HIP 41578 |
9.94 |
| 2026-05-31 12:00 |
08:29:54.40 |
+14:10:47.8 |
HIP 41578 |
18.77 |
| 2026-06-01 00:00 |
08:30:30.53 |
+14:08:58.4 |
HIP 41749 |
17.46 |
| 2026-06-01 12:00 |
08:31:06.78 |
+14:07:08.1 |
HIP 41749 |
19.23 |
| 2026-06-02 00:00 |
08:31:43.14 |
+14:05:16.7 |
HIP 41749 |
24.44 |