| Parameter |
Value |
| Designation |
C/2012 L3 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2012-06-12T05:16:49.045440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:16Z |
| Obs used |
255 |
| NEO |
- |
| M1 |
8.900 |
| K1 |
15.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-07-18.0000000 |
| e |
0.99079164 |
| q (au) |
3.045029 |
| a (au) |
330.681042 |
| i (deg) |
134.196647 |
| Ω (om, deg) |
53.489782 |
| ω (w, deg) |
107.093418 |
| M (ma, deg) |
0.005864 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.623 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.623 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.692 |
| k |
0.800 |
| 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 |
| 2012-06-12 |
2013-05-08 |
+8.7931 |
-4.384 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
10:05:11.20 |
-33:22:17.1 |
HIP 49434 |
4.68 |
| 2026-07-29 12:00 |
10:05:14.80 |
-33:22:13.7 |
HIP 49434 |
3.98 |
| 2026-07-30 00:00 |
10:05:18.42 |
-33:22:10.6 |
HIP 49434 |
3.30 |
| 2026-07-30 12:00 |
10:05:22.05 |
-33:22:07.9 |
HIP 49434 |
2.65 |
| 2026-07-31 00:00 |
10:05:25.70 |
-33:22:05.6 |
HIP 49434 |
2.07 |
| 2026-07-31 12:00 |
10:05:29.35 |
-33:22:03.6 |
HIP 49434 |
1.64 |
| 2026-08-01 00:00 |
10:05:33.02 |
-33:22:02.0 |
HIP 49434 |
1.50 |
| 2026-08-01 12:00 |
10:05:36.70 |
-33:22:00.7 |
HIP 49434 |
1.72 |
| 2026-08-02 00:00 |
10:05:40.39 |
-33:21:59.8 |
HIP 49434 |
2.20 |
| 2026-08-02 12:00 |
10:05:44.09 |
-33:21:59.2 |
HIP 49434 |
2.81 |
| 2026-08-03 00:00 |
10:05:47.80 |
-33:21:59.0 |
HIP 49434 |
3.49 |
| 2026-08-03 12:00 |
10:05:51.53 |
-33:21:59.2 |
HIP 49434 |
4.20 |
| 2026-08-04 00:00 |
10:05:55.26 |
-33:21:59.7 |
HIP 49434 |
4.93 |
| 2026-08-04 12:00 |
10:05:59.00 |
-33:22:00.6 |
HIP 49434 |
5.67 |
| 2026-08-05 00:00 |
10:06:02.75 |
-33:22:01.8 |
HIP 49434 |
6.43 |
| 2026-08-05 12:00 |
10:06:06.52 |
-33:22:03.4 |
HIP 49434 |
7.19 |
| 2026-08-06 00:00 |
10:06:10.29 |
-33:22:05.4 |
HIP 49434 |
7.95 |
| 2026-08-06 12:00 |
10:06:14.07 |
-33:22:07.7 |
HIP 49434 |
8.72 |
| 2026-08-07 00:00 |
10:06:17.86 |
-33:22:10.4 |
HIP 49434 |
9.50 |
| 2026-08-07 12:00 |
10:06:21.66 |
-33:22:13.4 |
HIP 49434 |
10.28 |
| 2026-08-08 00:00 |
10:06:25.46 |
-33:22:16.8 |
HIP 49434 |
11.06 |
| 2026-08-08 12:00 |
10:06:29.28 |
-33:22:20.5 |
HIP 49434 |
11.84 |
| 2026-08-09 00:00 |
10:06:33.10 |
-33:22:24.6 |
HIP 49434 |
12.63 |
| 2026-08-09 12:00 |
10:06:36.93 |
-33:22:29.1 |
HIP 49434 |
13.42 |
| 2026-08-10 00:00 |
10:06:40.76 |
-33:22:33.9 |
HIP 49434 |
14.22 |
| 2026-08-10 12:00 |
10:06:44.61 |
-33:22:39.1 |
HIP 49434 |
15.01 |
| 2026-08-11 00:00 |
10:06:48.46 |
-33:22:44.6 |
HIP 49434 |
15.81 |
| 2026-08-11 12:00 |
10:06:52.31 |
-33:22:50.5 |
HIP 49434 |
16.61 |
| 2026-08-12 00:00 |
10:06:56.18 |
-33:22:56.7 |
HIP 49434 |
17.41 |
| 2026-08-12 12:00 |
10:07:00.04 |
-33:23:03.3 |
HIP 49434 |
18.21 |
| 2026-08-13 00:00 |
10:07:03.92 |
-33:23:10.2 |
HIP 49434 |
19.02 |
| 2026-08-13 12:00 |
10:07:07.80 |
-33:23:17.5 |
HIP 49434 |
19.83 |
| 2026-08-14 00:00 |
10:07:11.68 |
-33:23:25.2 |
HIP 49434 |
20.64 |
| 2026-08-14 12:00 |
10:07:15.57 |
-33:23:33.2 |
HIP 49434 |
21.45 |
| 2026-08-15 00:00 |
10:07:19.46 |
-33:23:41.5 |
HIP 49434 |
22.26 |
| 2026-08-15 12:00 |
10:07:23.35 |
-33:23:50.2 |
HIP 49434 |
23.07 |
| 2026-08-16 00:00 |
10:07:27.25 |
-33:23:59.3 |
HIP 49434 |
23.89 |
| 2026-08-16 12:00 |
10:07:31.16 |
-33:24:08.7 |
HIP 49434 |
24.71 |
| 2026-08-17 00:00 |
10:07:35.06 |
-33:24:18.4 |
HIP 49434 |
25.53 |
| 2026-08-17 12:00 |
10:07:38.97 |
-33:24:28.5 |
HIP 49434 |
26.35 |
| 2026-08-18 00:00 |
10:07:42.88 |
-33:24:38.9 |
HIP 49434 |
27.17 |
| 2026-08-18 12:00 |
10:07:46.79 |
-33:24:49.7 |
HIP 49434 |
27.99 |
| 2026-08-19 00:00 |
10:07:50.71 |
-33:25:00.8 |
HIP 49434 |
28.82 |