| Parameter |
Value |
| Designation |
C/2012 K8 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-08-19T07:56:41.251200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:10Z |
| Obs used |
962 |
| NEO |
- |
| M1 |
5.500 |
| K1 |
10.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-03-05.0000000 |
| e |
1.00234308 |
| q (au) |
6.463005 |
| a (au) |
-2758.336424 |
| i (deg) |
106.111263 |
| Ω (om, deg) |
312.805677 |
| ω (w, deg) |
75.849793 |
| M (ma, deg) |
-0.001138 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.963 + 3.997\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.963 |
| n |
3.997 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
1.000 |
| 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) |
| 2026-06-01 00:00 |
08:23:54.09 |
+06:02:06.8 |
HIP 41020 |
24.88 |
| 2026-06-01 12:00 |
08:23:56.48 |
+06:02:01.0 |
HIP 41020 |
25.45 |
| 2026-06-02 00:00 |
08:23:58.90 |
+06:01:55.1 |
HIP 41020 |
26.02 |
| 2026-06-02 12:00 |
08:24:01.35 |
+06:01:49.0 |
HIP 41020 |
26.61 |
| 2026-06-03 00:00 |
08:24:03.82 |
+06:01:42.8 |
HIP 41020 |
27.20 |
| 2026-06-03 12:00 |
08:24:06.33 |
+06:01:36.3 |
HIP 41020 |
27.80 |
| 2026-06-04 00:00 |
08:24:08.86 |
+06:01:29.7 |
HIP 41020 |
28.41 |
| 2026-06-04 12:00 |
08:24:11.42 |
+06:01:22.8 |
HIP 41020 |
29.03 |
| 2026-06-05 00:00 |
08:24:14.01 |
+06:01:15.8 |
HIP 41020 |
29.65 |
| 2026-06-05 12:00 |
08:24:16.63 |
+06:01:08.6 |
HIP 41020 |
30.29 |
| 2026-06-06 00:00 |
08:24:19.28 |
+06:01:01.2 |
HIP 41020 |
30.93 |
| 2026-06-06 12:00 |
08:24:21.95 |
+06:00:53.6 |
HIP 41020 |
31.57 |
| 2026-06-07 00:00 |
08:24:24.65 |
+06:00:45.8 |
HIP 41020 |
32.23 |
| 2026-06-07 12:00 |
08:24:27.38 |
+06:00:37.9 |
HIP 41020 |
32.89 |
| 2026-06-08 00:00 |
08:24:30.13 |
+06:00:29.7 |
HIP 41020 |
33.56 |
| 2026-06-08 12:00 |
08:24:32.91 |
+06:00:21.4 |
HIP 41020 |
34.24 |
| 2026-06-09 00:00 |
08:24:35.71 |
+06:00:12.8 |
HIP 41020 |
34.93 |
| 2026-06-09 12:00 |
08:24:38.55 |
+06:00:04.1 |
HIP 41020 |
35.62 |
| 2026-06-10 00:00 |
08:24:41.41 |
+05:59:55.2 |
HIP 41020 |
36.32 |
| 2026-06-10 12:00 |
08:24:44.29 |
+05:59:46.1 |
HIP 41020 |
37.03 |
| 2026-06-11 00:00 |
08:24:47.20 |
+05:59:36.9 |
HIP 41020 |
37.74 |
| 2026-06-11 12:00 |
08:24:50.13 |
+05:59:27.4 |
HIP 41240 |
38.43 |
| 2026-06-12 00:00 |
08:24:53.09 |
+05:59:17.8 |
HIP 41240 |
38.26 |
| 2026-06-12 12:00 |
08:24:56.08 |
+05:59:07.9 |
HIP 41240 |
38.10 |
| 2026-06-13 00:00 |
08:24:59.08 |
+05:58:57.9 |
HIP 41240 |
37.95 |
| 2026-06-13 12:00 |
08:25:02.12 |
+05:58:47.7 |
HIP 41240 |
37.82 |
| 2026-06-14 00:00 |
08:25:05.17 |
+05:58:37.3 |
HIP 41240 |
37.70 |
| 2026-06-14 12:00 |
08:25:08.25 |
+05:58:26.7 |
HIP 41240 |
37.59 |
| 2026-06-15 00:00 |
08:25:11.36 |
+05:58:15.9 |
HIP 41240 |
37.49 |
| 2026-06-15 12:00 |
08:25:14.48 |
+05:58:05.0 |
HIP 41240 |
37.41 |
| 2026-06-16 00:00 |
08:25:17.63 |
+05:57:53.8 |
HIP 41240 |
37.35 |
| 2026-06-16 12:00 |
08:25:20.80 |
+05:57:42.5 |
HIP 41240 |
37.30 |
| 2026-06-17 00:00 |
08:25:24.00 |
+05:57:31.0 |
HIP 41240 |
37.26 |
| 2026-06-17 12:00 |
08:25:27.21 |
+05:57:19.3 |
HIP 41240 |
37.24 |
| 2026-06-18 00:00 |
08:25:30.45 |
+05:57:07.4 |
HIP 41240 |
37.24 |
| 2026-06-18 12:00 |
08:25:33.71 |
+05:56:55.3 |
HIP 41240 |
37.26 |
| 2026-06-19 00:00 |
08:25:36.99 |
+05:56:43.0 |
HIP 41240 |
37.29 |
| 2026-06-19 12:00 |
08:25:40.29 |
+05:56:30.6 |
HIP 41240 |
37.34 |
| 2026-06-20 00:00 |
08:25:43.61 |
+05:56:18.0 |
HIP 41240 |
37.41 |
| 2026-06-20 12:00 |
08:25:46.96 |
+05:56:05.2 |
HIP 41240 |
37.49 |
| 2026-06-21 00:00 |
08:25:50.32 |
+05:55:52.2 |
HIP 41240 |
37.60 |
| 2026-06-21 12:00 |
08:25:53.70 |
+05:55:39.0 |
HIP 41240 |
37.72 |
| 2026-06-22 00:00 |
08:25:57.10 |
+05:55:25.6 |
HIP 41240 |
37.86 |