| 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) |
| 2026-07-29 00:00 |
08:30:44.17 |
+05:31:11.1 |
HIP 41699 |
20.49 |
| 2026-07-29 12:00 |
08:30:48.26 |
+05:30:45.8 |
HIP 41699 |
20.62 |
| 2026-07-30 00:00 |
08:30:52.36 |
+05:30:20.3 |
HIP 41699 |
20.81 |
| 2026-07-30 12:00 |
08:30:56.45 |
+05:29:54.8 |
HIP 41699 |
21.05 |
| 2026-07-31 00:00 |
08:31:00.54 |
+05:29:29.1 |
HIP 41699 |
21.35 |
| 2026-07-31 12:00 |
08:31:04.62 |
+05:29:03.2 |
HIP 41699 |
21.69 |
| 2026-08-01 00:00 |
08:31:08.71 |
+05:28:37.3 |
HIP 41699 |
22.09 |
| 2026-08-01 12:00 |
08:31:12.79 |
+05:28:11.2 |
HIP 41699 |
22.53 |
| 2026-08-02 00:00 |
08:31:16.87 |
+05:27:45.0 |
HIP 41699 |
23.01 |
| 2026-08-02 12:00 |
08:31:20.95 |
+05:27:18.7 |
HIP 41699 |
23.53 |
| 2026-08-03 00:00 |
08:31:25.02 |
+05:26:52.3 |
HIP 41699 |
24.09 |
| 2026-08-03 12:00 |
08:31:29.09 |
+05:26:25.7 |
HIP 41898 |
23.73 |
| 2026-08-04 00:00 |
08:31:33.16 |
+05:25:59.0 |
HIP 41898 |
23.34 |
| 2026-08-04 12:00 |
08:31:37.22 |
+05:25:32.2 |
HIP 41898 |
23.00 |
| 2026-08-05 00:00 |
08:31:41.27 |
+05:25:05.3 |
HIP 41898 |
22.72 |
| 2026-08-05 12:00 |
08:31:45.33 |
+05:24:38.2 |
HIP 41898 |
22.48 |
| 2026-08-06 00:00 |
08:31:49.37 |
+05:24:11.1 |
HIP 41898 |
22.30 |
| 2026-08-06 12:00 |
08:31:53.41 |
+05:23:43.8 |
HIP 41898 |
22.18 |
| 2026-08-07 00:00 |
08:31:57.45 |
+05:23:16.4 |
HIP 41898 |
22.11 |
| 2026-08-07 12:00 |
08:32:01.48 |
+05:22:48.9 |
HIP 41898 |
22.10 |
| 2026-08-08 00:00 |
08:32:05.50 |
+05:22:21.3 |
HIP 41898 |
22.14 |
| 2026-08-08 12:00 |
08:32:09.52 |
+05:21:53.6 |
HIP 41898 |
22.25 |
| 2026-08-09 00:00 |
08:32:13.53 |
+05:21:25.8 |
HIP 41898 |
22.41 |
| 2026-08-09 12:00 |
08:32:17.54 |
+05:20:57.8 |
HIP 41898 |
22.62 |
| 2026-08-10 00:00 |
08:32:21.53 |
+05:20:29.8 |
HIP 41898 |
22.89 |
| 2026-08-10 12:00 |
08:32:25.52 |
+05:20:01.6 |
HIP 41898 |
23.21 |
| 2026-08-11 00:00 |
08:32:29.50 |
+05:19:33.4 |
HIP 41898 |
23.57 |
| 2026-08-11 12:00 |
08:32:33.47 |
+05:19:05.0 |
HIP 41898 |
23.99 |
| 2026-08-12 00:00 |
08:32:37.44 |
+05:18:36.5 |
HIP 41898 |
24.44 |
| 2026-08-12 12:00 |
08:32:41.39 |
+05:18:08.0 |
HIP 41898 |
24.94 |
| 2026-08-13 00:00 |
08:32:45.34 |
+05:17:39.3 |
HIP 41898 |
25.48 |
| 2026-08-13 12:00 |
08:32:49.27 |
+05:17:10.5 |
HIP 41898 |
26.05 |
| 2026-08-14 00:00 |
08:32:53.20 |
+05:16:41.6 |
HIP 41898 |
26.66 |
| 2026-08-14 12:00 |
08:32:57.11 |
+05:16:12.7 |
HIP 41898 |
27.30 |
| 2026-08-15 00:00 |
08:33:01.02 |
+05:15:43.6 |
HIP 42076 |
27.15 |
| 2026-08-15 12:00 |
08:33:04.92 |
+05:15:14.5 |
HIP 42076 |
26.60 |
| 2026-08-16 00:00 |
08:33:08.80 |
+05:14:45.2 |
HIP 42076 |
26.10 |
| 2026-08-16 12:00 |
08:33:12.67 |
+05:14:15.9 |
HIP 42076 |
25.63 |
| 2026-08-17 00:00 |
08:33:16.53 |
+05:13:46.5 |
HIP 42076 |
25.20 |
| 2026-08-17 12:00 |
08:33:20.38 |
+05:13:16.9 |
HIP 42076 |
24.82 |
| 2026-08-18 00:00 |
08:33:24.22 |
+05:12:47.3 |
HIP 42076 |
24.48 |
| 2026-08-18 12:00 |
08:33:28.04 |
+05:12:17.7 |
HIP 42076 |
24.19 |
| 2026-08-19 00:00 |
08:33:31.86 |
+05:11:47.9 |
HIP 42076 |
23.94 |