| Parameter |
Value |
| Designation |
C/2013 G6 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-07-25T05:28:45.828480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:34Z |
| Obs used |
230 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
27.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-06-18.0000000 |
| e |
0.99470498 |
| q (au) |
2.048499 |
| a (au) |
386.872597 |
| i (deg) |
124.084326 |
| Ω (om, deg) |
44.567402 |
| ω (w, deg) |
215.692475 |
| M (ma, deg) |
359.995178 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.905 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.905 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.985 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2013-04-13 |
2013-07-08 |
+39.8450 |
-14.076 |
| 2013-08-03 |
2014-02-05 |
+22.5987 |
-10.710 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
02:34:58.33 |
+19:38:51.3 |
HIP 11968 |
21.83 |
| 2026-06-01 12:00 |
02:35:01.57 |
+19:39:12.1 |
HIP 11968 |
21.81 |
| 2026-06-02 00:00 |
02:35:04.79 |
+19:39:32.9 |
HIP 11968 |
21.82 |
| 2026-06-02 12:00 |
02:35:07.99 |
+19:39:53.6 |
HIP 11968 |
21.87 |
| 2026-06-03 00:00 |
02:35:11.18 |
+19:40:14.2 |
HIP 11968 |
21.94 |
| 2026-06-03 12:00 |
02:35:14.35 |
+19:40:34.9 |
HIP 11968 |
22.04 |
| 2026-06-04 00:00 |
02:35:17.51 |
+19:40:55.4 |
HIP 11968 |
22.17 |
| 2026-06-04 12:00 |
02:35:20.65 |
+19:41:16.0 |
HIP 11968 |
22.33 |
| 2026-06-05 00:00 |
02:35:23.77 |
+19:41:36.5 |
HIP 11968 |
22.51 |
| 2026-06-05 12:00 |
02:35:26.87 |
+19:41:56.9 |
HIP 11968 |
22.72 |
| 2026-06-06 00:00 |
02:35:29.95 |
+19:42:17.3 |
HIP 11968 |
22.95 |
| 2026-06-06 12:00 |
02:35:33.02 |
+19:42:37.6 |
HIP 11968 |
23.21 |
| 2026-06-07 00:00 |
02:35:36.07 |
+19:42:57.9 |
HIP 11968 |
23.49 |
| 2026-06-07 12:00 |
02:35:39.10 |
+19:43:18.1 |
HIP 11968 |
23.78 |
| 2026-06-08 00:00 |
02:35:42.12 |
+19:43:38.2 |
HIP 11968 |
24.10 |
| 2026-06-08 12:00 |
02:35:45.11 |
+19:43:58.3 |
HIP 11968 |
24.44 |
| 2026-06-09 00:00 |
02:35:48.09 |
+19:44:18.4 |
HIP 11968 |
24.79 |
| 2026-06-09 12:00 |
02:35:51.04 |
+19:44:38.4 |
HIP 11968 |
25.16 |
| 2026-06-10 00:00 |
02:35:53.98 |
+19:44:58.3 |
HIP 11968 |
25.54 |
| 2026-06-10 12:00 |
02:35:56.90 |
+19:45:18.2 |
HIP 11968 |
25.94 |
| 2026-06-11 00:00 |
02:35:59.79 |
+19:45:38.0 |
HIP 11968 |
26.35 |
| 2026-06-11 12:00 |
02:36:02.67 |
+19:45:57.7 |
HIP 11968 |
26.77 |
| 2026-06-12 00:00 |
02:36:05.53 |
+19:46:17.4 |
HIP 12097 |
27.08 |
| 2026-06-12 12:00 |
02:36:08.36 |
+19:46:37.0 |
HIP 12097 |
26.84 |
| 2026-06-13 00:00 |
02:36:11.18 |
+19:46:56.6 |
HIP 12097 |
26.61 |
| 2026-06-13 12:00 |
02:36:13.97 |
+19:47:16.0 |
HIP 12097 |
26.40 |
| 2026-06-14 00:00 |
02:36:16.75 |
+19:47:35.5 |
HIP 12097 |
26.22 |
| 2026-06-14 12:00 |
02:36:19.50 |
+19:47:54.8 |
HIP 12097 |
26.05 |
| 2026-06-15 00:00 |
02:36:22.23 |
+19:48:14.1 |
HIP 12097 |
25.90 |
| 2026-06-15 12:00 |
02:36:24.94 |
+19:48:33.2 |
HIP 12266 |
25.74 |
| 2026-06-16 00:00 |
02:36:27.62 |
+19:48:52.4 |
HIP 12266 |
25.04 |
| 2026-06-16 12:00 |
02:36:30.28 |
+19:49:11.4 |
HIP 12266 |
24.35 |
| 2026-06-17 00:00 |
02:36:32.93 |
+19:49:30.4 |
HIP 12266 |
23.66 |
| 2026-06-17 12:00 |
02:36:35.54 |
+19:49:49.3 |
HIP 12266 |
22.98 |
| 2026-06-18 00:00 |
02:36:38.14 |
+19:50:08.1 |
HIP 12266 |
22.30 |
| 2026-06-18 12:00 |
02:36:40.71 |
+19:50:26.8 |
HIP 12266 |
21.62 |
| 2026-06-19 00:00 |
02:36:43.26 |
+19:50:45.5 |
HIP 12266 |
20.96 |
| 2026-06-19 12:00 |
02:36:45.78 |
+19:51:04.0 |
HIP 12266 |
20.30 |
| 2026-06-20 00:00 |
02:36:48.28 |
+19:51:22.5 |
HIP 12266 |
19.64 |
| 2026-06-20 12:00 |
02:36:50.76 |
+19:51:40.9 |
HIP 12266 |
18.99 |
| 2026-06-21 00:00 |
02:36:53.21 |
+19:51:59.2 |
HIP 12266 |
18.35 |
| 2026-06-21 12:00 |
02:36:55.64 |
+19:52:17.5 |
HIP 12266 |
17.71 |
| 2026-06-22 00:00 |
02:36:58.04 |
+19:52:35.6 |
HIP 12266 |
17.08 |