| Parameter |
Value |
| Designation |
C/2018 KJ3 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-09-09T23:33:42.448320Z |
| Orbit solution date (soln_date, UTC) |
2021-09-04T23:42:57Z |
| Obs used |
465 |
| NEO |
- |
| M1 |
6.400 |
| K1 |
13.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-08-10.0000000 |
| e |
0.99581434 |
| q (au) |
3.627197 |
| a (au) |
866.577156 |
| i (deg) |
136.667328 |
| Ω (om, deg) |
91.587697 |
| ω (w, deg) |
217.709783 |
| M (ma, deg) |
359.984701 |
Magnitude
Scatter + Global Linear
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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) |
| 2026-05-12 00:00 |
06:46:36.60 |
+11:42:05.0 |
HIP 32595 |
24.27 |
| 2026-05-12 12:00 |
06:46:40.28 |
+11:42:26.5 |
HIP 32595 |
23.72 |
| 2026-05-13 00:00 |
06:46:44.01 |
+11:42:47.7 |
HIP 32595 |
23.18 |
| 2026-05-13 12:00 |
06:46:47.77 |
+11:43:08.7 |
HIP 32595 |
22.67 |
| 2026-05-14 00:00 |
06:46:51.58 |
+11:43:29.6 |
HIP 32595 |
22.17 |
| 2026-05-14 12:00 |
06:46:55.42 |
+11:43:50.3 |
HIP 32595 |
21.71 |
| 2026-05-15 00:00 |
06:46:59.31 |
+11:44:10.8 |
HIP 32595 |
21.27 |
| 2026-05-15 12:00 |
06:47:03.23 |
+11:44:31.1 |
HIP 32595 |
20.86 |
| 2026-05-16 00:00 |
06:47:07.19 |
+11:44:51.2 |
HIP 32595 |
20.48 |
| 2026-05-16 12:00 |
06:47:11.19 |
+11:45:11.1 |
HIP 32595 |
20.14 |
| 2026-05-17 00:00 |
06:47:15.22 |
+11:45:30.9 |
HIP 32595 |
19.85 |
| 2026-05-17 12:00 |
06:47:19.29 |
+11:45:50.4 |
HIP 32595 |
19.59 |
| 2026-05-18 00:00 |
06:47:23.40 |
+11:46:09.8 |
HIP 32595 |
19.39 |
| 2026-05-18 12:00 |
06:47:27.55 |
+11:46:29.0 |
HIP 32595 |
19.23 |
| 2026-05-19 00:00 |
06:47:31.73 |
+11:46:48.0 |
HIP 32595 |
19.12 |
| 2026-05-19 12:00 |
06:47:35.94 |
+11:47:06.8 |
HIP 32595 |
19.07 |
| 2026-05-20 00:00 |
06:47:40.19 |
+11:47:25.4 |
HIP 32595 |
19.08 |
| 2026-05-20 12:00 |
06:47:44.48 |
+11:47:43.8 |
HIP 32595 |
19.14 |
| 2026-05-21 00:00 |
06:47:48.80 |
+11:48:02.0 |
HIP 32595 |
19.26 |
| 2026-05-21 12:00 |
06:47:53.15 |
+11:48:20.1 |
HIP 32595 |
19.43 |
| 2026-05-22 00:00 |
06:47:57.54 |
+11:48:37.9 |
HIP 32595 |
19.67 |
| 2026-05-22 12:00 |
06:48:01.96 |
+11:48:55.6 |
HIP 32595 |
19.96 |
| 2026-05-23 00:00 |
06:48:06.41 |
+11:49:13.1 |
HIP 32595 |
20.30 |
| 2026-05-23 12:00 |
06:48:10.89 |
+11:49:30.3 |
HIP 32595 |
20.70 |
| 2026-05-24 00:00 |
06:48:15.41 |
+11:49:47.4 |
HIP 32595 |
21.15 |
| 2026-05-24 12:00 |
06:48:19.95 |
+11:50:04.3 |
HIP 32595 |
21.65 |
| 2026-05-25 00:00 |
06:48:24.53 |
+11:50:21.1 |
HIP 32710 |
21.56 |
| 2026-05-25 12:00 |
06:48:29.14 |
+11:50:37.6 |
HIP 32710 |
20.57 |
| 2026-05-26 00:00 |
06:48:33.78 |
+11:50:53.9 |
HIP 32710 |
19.59 |
| 2026-05-26 12:00 |
06:48:38.44 |
+11:51:10.1 |
HIP 32710 |
18.62 |
| 2026-05-27 00:00 |
06:48:43.14 |
+11:51:26.1 |
HIP 32710 |
17.69 |
| 2026-05-27 12:00 |
06:48:47.87 |
+11:51:41.8 |
HIP 32710 |
16.78 |
| 2026-05-28 00:00 |
06:48:52.62 |
+11:51:57.4 |
HIP 32710 |
15.90 |
| 2026-05-28 12:00 |
06:48:57.40 |
+11:52:12.8 |
HIP 32710 |
15.07 |
| 2026-05-29 00:00 |
06:49:02.21 |
+11:52:28.0 |
HIP 32710 |
14.30 |
| 2026-05-29 12:00 |
06:49:07.05 |
+11:52:43.1 |
HIP 32710 |
13.58 |
| 2026-05-30 00:00 |
06:49:11.91 |
+11:52:57.9 |
HIP 32710 |
12.94 |
| 2026-05-30 12:00 |
06:49:16.80 |
+11:53:12.5 |
HIP 32710 |
12.39 |
| 2026-05-31 00:00 |
06:49:21.72 |
+11:53:27.0 |
HIP 32710 |
11.93 |
| 2026-05-31 12:00 |
06:49:26.66 |
+11:53:41.3 |
HIP 32710 |
11.60 |
| 2026-06-01 00:00 |
06:49:31.63 |
+11:53:55.4 |
HIP 32710 |
11.39 |
| 2026-06-01 12:00 |
06:49:36.63 |
+11:54:09.3 |
HIP 32776 |
11.23 |
| 2026-06-02 00:00 |
06:49:41.65 |
+11:54:23.0 |
HIP 32776 |
10.40 |