| 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
$$
M_a = (14.422 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
08:32:19.61 |
+14:03:24.3 |
HIP 41749 |
31.44 |
| 2026-06-03 00:00 |
08:32:56.19 |
+14:01:30.9 |
HIP 41997 |
30.11 |
| 2026-06-03 12:00 |
08:33:32.88 |
+13:59:36.4 |
HIP 41997 |
26.57 |
| 2026-06-04 00:00 |
08:34:09.69 |
+13:57:41.0 |
HIP 42165 |
25.34 |
| 2026-06-04 12:00 |
08:34:46.60 |
+13:55:44.5 |
HIP 42165 |
18.51 |
| 2026-06-05 00:00 |
08:35:23.61 |
+13:53:46.9 |
HIP 42193 |
13.52 |
| 2026-06-05 12:00 |
08:36:00.74 |
+13:51:48.4 |
HIP 42193 |
5.72 |
| 2026-06-06 00:00 |
08:36:37.97 |
+13:49:48.8 |
HIP 42195 |
7.05 |
| 2026-06-06 12:00 |
08:37:15.30 |
+13:47:48.2 |
HIP 42241 |
14.53 |
| 2026-06-07 00:00 |
08:37:52.74 |
+13:45:46.5 |
HIP 42241 |
22.29 |
| 2026-06-07 12:00 |
08:38:30.28 |
+13:43:43.8 |
HIP 42241 |
30.95 |
| 2026-06-08 00:00 |
08:39:07.92 |
+13:41:40.1 |
HIP 42563 |
22.43 |
| 2026-06-08 12:00 |
08:39:45.66 |
+13:39:35.4 |
HIP 42563 |
13.22 |
| 2026-06-09 00:00 |
08:40:23.51 |
+13:37:29.6 |
HIP 42563 |
4.79 |
| 2026-06-09 12:00 |
08:41:01.45 |
+13:35:22.8 |
HIP 42563 |
7.01 |
| 2026-06-10 00:00 |
08:41:39.49 |
+13:33:15.0 |
HIP 42563 |
15.98 |
| 2026-06-10 12:00 |
08:42:17.63 |
+13:31:06.1 |
HIP 42848 |
24.01 |
| 2026-06-11 00:00 |
08:42:55.86 |
+13:28:56.2 |
HIP 42848 |
16.27 |
| 2026-06-11 12:00 |
08:43:34.19 |
+13:26:45.3 |
HIP 42848 |
11.61 |
| 2026-06-12 00:00 |
08:44:12.62 |
+13:24:33.3 |
HIP 42848 |
13.74 |
| 2026-06-12 12:00 |
08:44:51.14 |
+13:22:20.3 |
HIP 43018 |
17.81 |
| 2026-06-13 00:00 |
08:45:29.75 |
+13:20:06.3 |
HIP 43018 |
8.36 |
| 2026-06-13 12:00 |
08:46:08.46 |
+13:17:51.2 |
HIP 43018 |
3.02 |
| 2026-06-14 00:00 |
08:46:47.25 |
+13:15:35.2 |
HIP 43018 |
11.67 |
| 2026-06-14 12:00 |
08:47:26.14 |
+13:13:18.0 |
HIP 43018 |
21.29 |
| 2026-06-15 00:00 |
08:48:05.12 |
+13:10:59.9 |
HIP 43018 |
31.00 |
| 2026-06-15 12:00 |
08:48:44.18 |
+13:08:40.7 |
HIP 43441 |
32.30 |
| 2026-06-16 00:00 |
08:49:23.33 |
+13:06:20.5 |
HIP 43441 |
22.51 |
| 2026-06-16 12:00 |
08:50:02.57 |
+13:03:59.3 |
HIP 43441 |
12.74 |
| 2026-06-17 00:00 |
08:50:41.89 |
+13:01:37.1 |
HIP 43441 |
3.34 |
| 2026-06-17 12:00 |
08:51:21.29 |
+12:59:13.8 |
HIP 43441 |
7.42 |
| 2026-06-18 00:00 |
08:52:00.78 |
+12:56:49.5 |
HIP 43441 |
17.19 |
| 2026-06-18 12:00 |
08:52:40.35 |
+12:54:24.2 |
HIP 43569 |
20.01 |
| 2026-06-19 00:00 |
08:53:20.00 |
+12:51:57.9 |
HIP 43569 |
25.93 |
| 2026-06-19 12:00 |
08:53:59.73 |
+12:49:30.6 |
HIP 43569 |
33.83 |
| 2026-06-20 00:00 |
08:54:39.54 |
+12:47:02.3 |
HIP 43897 |
34.84 |
| 2026-06-20 12:00 |
08:55:19.43 |
+12:44:32.9 |
HIP 43897 |
25.89 |
| 2026-06-21 00:00 |
08:55:59.39 |
+12:42:02.6 |
HIP 43897 |
18.10 |
| 2026-06-21 12:00 |
08:56:39.43 |
+12:39:31.2 |
HIP 43897 |
13.69 |
| 2026-06-22 00:00 |
08:57:19.54 |
+12:36:58.9 |
HIP 44008 |
10.89 |