| 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) |
| 2026-09-20 00:00 |
08:36:57.88 |
+04:38:07.8 |
HIP 42318 |
28.54 |
| 2026-09-20 12:00 |
08:37:00.32 |
+04:37:35.5 |
HIP 42318 |
28.82 |
| 2026-09-21 00:00 |
08:37:02.74 |
+04:37:03.2 |
HIP 42318 |
29.13 |
| 2026-09-21 12:00 |
08:37:05.13 |
+04:36:30.9 |
HIP 42318 |
29.45 |
| 2026-09-22 00:00 |
08:37:07.48 |
+04:35:58.6 |
HIP 42318 |
29.80 |
| 2026-09-22 12:00 |
08:37:09.81 |
+04:35:26.3 |
HIP 42318 |
30.16 |
| 2026-09-23 00:00 |
08:37:12.11 |
+04:34:54.0 |
HIP 42318 |
30.55 |
| 2026-09-23 12:00 |
08:37:14.38 |
+04:34:21.8 |
HIP 42318 |
30.94 |
| 2026-09-24 00:00 |
08:37:16.62 |
+04:33:49.6 |
HIP 42318 |
31.36 |
| 2026-09-24 12:00 |
08:37:18.82 |
+04:33:17.4 |
HIP 42318 |
31.79 |
| 2026-09-25 00:00 |
08:37:21.00 |
+04:32:45.2 |
HIP 42318 |
32.23 |
| 2026-09-25 12:00 |
08:37:23.15 |
+04:32:13.0 |
HIP 42318 |
32.68 |
| 2026-09-26 00:00 |
08:37:25.26 |
+04:31:40.9 |
HIP 42318 |
33.15 |
| 2026-09-26 12:00 |
08:37:27.35 |
+04:31:08.8 |
HIP 42318 |
33.63 |
| 2026-09-27 00:00 |
08:37:29.40 |
+04:30:36.7 |
HIP 42318 |
34.11 |
| 2026-09-27 12:00 |
08:37:31.42 |
+04:30:04.7 |
HIP 42318 |
34.61 |
| 2026-09-28 00:00 |
08:37:33.41 |
+04:29:32.7 |
HIP 42318 |
35.11 |
| 2026-09-28 12:00 |
08:37:35.37 |
+04:29:00.7 |
HIP 42318 |
35.62 |
| 2026-09-29 00:00 |
08:37:37.30 |
+04:28:28.7 |
HIP 42318 |
36.14 |
| 2026-09-29 12:00 |
08:37:39.19 |
+04:27:56.8 |
HIP 42205 |
36.28 |
| 2026-09-30 00:00 |
08:37:41.06 |
+04:27:24.9 |
HIP 42205 |
36.09 |
| 2026-09-30 12:00 |
08:37:42.88 |
+04:26:53.1 |
HIP 42205 |
35.91 |
| 2026-10-01 00:00 |
08:37:44.68 |
+04:26:21.3 |
HIP 42205 |
35.74 |
| 2026-10-01 12:00 |
08:37:46.44 |
+04:25:49.5 |
HIP 42205 |
35.57 |
| 2026-10-02 00:00 |
08:37:48.18 |
+04:25:17.8 |
HIP 42205 |
35.42 |
| 2026-10-02 12:00 |
08:37:49.87 |
+04:24:46.2 |
HIP 42205 |
35.27 |
| 2026-10-03 00:00 |
08:37:51.54 |
+04:24:14.5 |
HIP 42205 |
35.13 |
| 2026-10-03 12:00 |
08:37:53.17 |
+04:23:43.0 |
HIP 42529 |
34.98 |
| 2026-10-04 00:00 |
08:37:54.76 |
+04:23:11.4 |
HIP 42529 |
34.59 |
| 2026-10-04 12:00 |
08:37:56.32 |
+04:22:40.0 |
HIP 42529 |
34.22 |
| 2026-10-05 00:00 |
08:37:57.85 |
+04:22:08.6 |
HIP 42529 |
33.87 |
| 2026-10-05 12:00 |
08:37:59.34 |
+04:21:37.2 |
HIP 42529 |
33.53 |
| 2026-10-06 00:00 |
08:38:00.80 |
+04:21:05.9 |
HIP 42529 |
33.21 |
| 2026-10-06 12:00 |
08:38:02.23 |
+04:20:34.6 |
HIP 42529 |
32.90 |
| 2026-10-07 00:00 |
08:38:03.61 |
+04:20:03.5 |
HIP 42529 |
32.62 |
| 2026-10-07 12:00 |
08:38:04.97 |
+04:19:32.3 |
HIP 42529 |
32.35 |
| 2026-10-08 00:00 |
08:38:06.28 |
+04:19:01.3 |
HIP 42529 |
32.10 |
| 2026-10-08 12:00 |
08:38:07.56 |
+04:18:30.3 |
HIP 42529 |
31.87 |
| 2026-10-09 00:00 |
08:38:08.81 |
+04:17:59.3 |
HIP 42529 |
31.66 |
| 2026-10-09 12:00 |
08:38:10.02 |
+04:17:28.5 |
HIP 42529 |
31.46 |
| 2026-10-10 00:00 |
08:38:11.19 |
+04:16:57.7 |
HIP 42529 |
31.29 |
| 2026-10-10 12:00 |
08:38:12.33 |
+04:16:27.0 |
HIP 42529 |
31.13 |
| 2026-10-11 00:00 |
08:38:13.43 |
+04:15:56.3 |
HIP 42529 |
31.00 |