C/2013 G6 (Lemmon)
| 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
$$
M_a = (13.902 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.902 |
| 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 |
+39.8436 |
-14.073 |
| 2013-08-03 |
2014-02-05 |
+22.5987 |
-10.706 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
02:23:58.89 |
+18:39:28.3 |
HIP 11083 |
23.60 |
| 2026-02-03 12:00 |
02:23:59.06 |
+18:39:28.2 |
HIP 11083 |
23.63 |
| 2026-02-04 00:00 |
02:23:59.26 |
+18:39:28.3 |
HIP 11083 |
23.67 |
| 2026-02-04 12:00 |
02:23:59.50 |
+18:39:28.5 |
HIP 11083 |
23.72 |
| 2026-02-05 00:00 |
02:23:59.78 |
+18:39:29.0 |
HIP 11083 |
23.77 |
| 2026-02-05 12:00 |
02:24:00.09 |
+18:39:29.6 |
HIP 11083 |
23.84 |
| 2026-02-06 00:00 |
02:24:00.44 |
+18:39:30.4 |
HIP 11083 |
23.91 |
| 2026-02-06 12:00 |
02:24:00.82 |
+18:39:31.4 |
HIP 11083 |
23.99 |
| 2026-02-07 00:00 |
02:24:01.25 |
+18:39:32.6 |
HIP 11083 |
24.08 |
| 2026-02-07 12:00 |
02:24:01.70 |
+18:39:33.9 |
HIP 11083 |
24.18 |
| 2026-02-08 00:00 |
02:24:02.20 |
+18:39:35.5 |
HIP 11083 |
24.29 |
| 2026-02-08 12:00 |
02:24:02.73 |
+18:39:37.2 |
HIP 11083 |
24.41 |
| 2026-02-09 00:00 |
02:24:03.29 |
+18:39:39.1 |
HIP 11083 |
24.53 |
| 2026-02-09 12:00 |
02:24:03.89 |
+18:39:41.2 |
HIP 11083 |
24.66 |
| 2026-02-10 00:00 |
02:24:04.53 |
+18:39:43.4 |
HIP 11083 |
24.81 |
| 2026-02-10 12:00 |
02:24:05.20 |
+18:39:45.9 |
HIP 11083 |
24.96 |
| 2026-02-11 00:00 |
02:24:05.91 |
+18:39:48.5 |
HIP 11083 |
25.12 |
| 2026-02-11 12:00 |
02:24:06.65 |
+18:39:51.3 |
HIP 11083 |
25.29 |
| 2026-02-12 00:00 |
02:24:07.43 |
+18:39:54.3 |
HIP 11083 |
25.46 |
| 2026-02-12 12:00 |
02:24:08.24 |
+18:39:57.4 |
HIP 11083 |
25.65 |
| 2026-02-13 00:00 |
02:24:09.09 |
+18:40:00.8 |
HIP 11083 |
25.84 |
| 2026-02-13 12:00 |
02:24:09.97 |
+18:40:04.3 |
HIP 11083 |
26.05 |
| 2026-02-14 00:00 |
02:24:10.89 |
+18:40:08.0 |
HIP 11083 |
26.26 |
| 2026-02-14 12:00 |
02:24:11.84 |
+18:40:11.9 |
HIP 11083 |
26.48 |
| 2026-02-15 00:00 |
02:24:12.82 |
+18:40:15.9 |
HIP 11083 |
26.71 |
| 2026-02-15 12:00 |
02:24:13.84 |
+18:40:20.1 |
HIP 11083 |
26.94 |
| 2026-02-16 00:00 |
02:24:14.90 |
+18:40:24.6 |
HIP 11083 |
27.19 |
| 2026-02-16 12:00 |
02:24:15.99 |
+18:40:29.1 |
HIP 11083 |
27.45 |
| 2026-02-17 00:00 |
02:24:17.11 |
+18:40:33.9 |
HIP 11083 |
27.71 |
| 2026-02-17 12:00 |
02:24:18.27 |
+18:40:38.8 |
HIP 11083 |
27.98 |
| 2026-02-18 00:00 |
02:24:19.46 |
+18:40:44.0 |
HIP 11083 |
28.26 |
| 2026-02-18 12:00 |
02:24:20.68 |
+18:40:49.3 |
HIP 11083 |
28.55 |
| 2026-02-19 00:00 |
02:24:21.94 |
+18:40:54.7 |
HIP 11083 |
28.85 |
| 2026-02-19 12:00 |
02:24:23.23 |
+18:41:00.4 |
HIP 11083 |
29.15 |
| 2026-02-20 00:00 |
02:24:24.55 |
+18:41:06.2 |
HIP 11355 |
29.10 |
| 2026-02-20 12:00 |
02:24:25.90 |
+18:41:12.2 |
HIP 11355 |
28.77 |
| 2026-02-21 00:00 |
02:24:27.29 |
+18:41:18.3 |
HIP 11355 |
28.43 |
| 2026-02-21 12:00 |
02:24:28.71 |
+18:41:24.7 |
HIP 11355 |
28.08 |
| 2026-02-22 00:00 |
02:24:30.17 |
+18:41:31.2 |
HIP 11355 |
27.73 |
| 2026-02-22 12:00 |
02:24:31.65 |
+18:41:37.8 |
HIP 11355 |
27.36 |
| 2026-02-23 00:00 |
02:24:33.17 |
+18:41:44.7 |
HIP 11355 |
26.99 |
| 2026-02-23 12:00 |
02:24:34.72 |
+18:41:51.7 |
HIP 11355 |
26.61 |
| 2026-02-24 00:00 |
02:24:36.30 |
+18:41:58.9 |
HIP 11355 |
26.23 |