| 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 |
1.000 |
| 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) |
| 2026-05-12 00:00 |
08:22:44.89 |
+06:03:23.7 |
HIP 41020 |
9.22 |
| 2026-05-12 12:00 |
08:22:45.94 |
+06:03:25.3 |
HIP 41020 |
9.44 |
| 2026-05-13 00:00 |
08:22:47.03 |
+06:03:26.7 |
HIP 41020 |
9.67 |
| 2026-05-13 12:00 |
08:22:48.15 |
+06:03:28.0 |
HIP 41020 |
9.91 |
| 2026-05-14 00:00 |
08:22:49.31 |
+06:03:29.1 |
HIP 41020 |
10.16 |
| 2026-05-14 12:00 |
08:22:50.51 |
+06:03:30.0 |
HIP 41020 |
10.41 |
| 2026-05-15 00:00 |
08:22:51.74 |
+06:03:30.8 |
HIP 41020 |
10.68 |
| 2026-05-15 12:00 |
08:22:53.01 |
+06:03:31.4 |
HIP 41020 |
10.95 |
| 2026-05-16 00:00 |
08:22:54.32 |
+06:03:31.7 |
HIP 41020 |
11.23 |
| 2026-05-16 12:00 |
08:22:55.66 |
+06:03:31.9 |
HIP 41020 |
11.52 |
| 2026-05-17 00:00 |
08:22:57.04 |
+06:03:32.0 |
HIP 41020 |
11.82 |
| 2026-05-17 12:00 |
08:22:58.45 |
+06:03:31.8 |
HIP 41020 |
12.12 |
| 2026-05-18 00:00 |
08:22:59.90 |
+06:03:31.4 |
HIP 41020 |
12.44 |
| 2026-05-18 12:00 |
08:23:01.39 |
+06:03:30.9 |
HIP 41020 |
12.76 |
| 2026-05-19 00:00 |
08:23:02.91 |
+06:03:30.2 |
HIP 41020 |
13.10 |
| 2026-05-19 12:00 |
08:23:04.46 |
+06:03:29.3 |
HIP 41020 |
13.44 |
| 2026-05-20 00:00 |
08:23:06.05 |
+06:03:28.2 |
HIP 41020 |
13.79 |
| 2026-05-20 12:00 |
08:23:07.68 |
+06:03:27.0 |
HIP 41020 |
14.15 |
| 2026-05-21 00:00 |
08:23:09.34 |
+06:03:25.5 |
HIP 41020 |
14.52 |
| 2026-05-21 12:00 |
08:23:11.03 |
+06:03:23.9 |
HIP 41020 |
14.90 |
| 2026-05-22 00:00 |
08:23:12.76 |
+06:03:22.1 |
HIP 41020 |
15.28 |
| 2026-05-22 12:00 |
08:23:14.52 |
+06:03:20.1 |
HIP 41020 |
15.68 |
| 2026-05-23 00:00 |
08:23:16.31 |
+06:03:17.9 |
HIP 41020 |
16.09 |
| 2026-05-23 12:00 |
08:23:18.14 |
+06:03:15.5 |
HIP 41020 |
16.50 |
| 2026-05-24 00:00 |
08:23:20.00 |
+06:03:13.0 |
HIP 41020 |
16.92 |
| 2026-05-24 12:00 |
08:23:21.89 |
+06:03:10.2 |
HIP 41020 |
17.35 |
| 2026-05-25 00:00 |
08:23:23.82 |
+06:03:07.3 |
HIP 41020 |
17.79 |
| 2026-05-25 12:00 |
08:23:25.78 |
+06:03:04.2 |
HIP 41020 |
18.24 |
| 2026-05-26 00:00 |
08:23:27.77 |
+06:03:00.9 |
HIP 41020 |
18.70 |
| 2026-05-26 12:00 |
08:23:29.79 |
+06:02:57.4 |
HIP 41020 |
19.17 |
| 2026-05-27 00:00 |
08:23:31.85 |
+06:02:53.7 |
HIP 41020 |
19.65 |
| 2026-05-27 12:00 |
08:23:33.93 |
+06:02:49.8 |
HIP 41020 |
20.13 |
| 2026-05-28 00:00 |
08:23:36.05 |
+06:02:45.8 |
HIP 41020 |
20.62 |
| 2026-05-28 12:00 |
08:23:38.20 |
+06:02:41.6 |
HIP 41020 |
21.13 |
| 2026-05-29 00:00 |
08:23:40.38 |
+06:02:37.2 |
HIP 41020 |
21.64 |
| 2026-05-29 12:00 |
08:23:42.59 |
+06:02:32.6 |
HIP 41020 |
22.16 |
| 2026-05-30 00:00 |
08:23:44.83 |
+06:02:27.8 |
HIP 41020 |
22.68 |
| 2026-05-30 12:00 |
08:23:47.10 |
+06:02:22.8 |
HIP 41020 |
23.22 |
| 2026-05-31 00:00 |
08:23:49.40 |
+06:02:17.6 |
HIP 41020 |
23.76 |
| 2026-05-31 12:00 |
08:23:51.73 |
+06:02:12.3 |
HIP 41020 |
24.32 |
| 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 |