C/2012 L3 (LINEAR)
| 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 |
0.999 |
| 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) |
| 2026-02-03 00:00 |
10:13:49.77 |
-36:25:27.8 |
HIP 50234 |
19.16 |
| 2026-02-03 12:00 |
10:13:44.66 |
-36:25:26.4 |
HIP 50234 |
20.15 |
| 2026-02-04 00:00 |
10:13:39.54 |
-36:25:24.5 |
HIP 50234 |
21.15 |
| 2026-02-04 12:00 |
10:13:34.41 |
-36:25:22.2 |
HIP 50234 |
22.15 |
| 2026-02-05 00:00 |
10:13:29.26 |
-36:25:19.4 |
HIP 50234 |
23.16 |
| 2026-02-05 12:00 |
10:13:24.11 |
-36:25:16.2 |
HIP 50234 |
24.18 |
| 2026-02-06 00:00 |
10:13:18.94 |
-36:25:12.6 |
HIP 50234 |
25.21 |
| 2026-02-06 12:00 |
10:13:13.76 |
-36:25:08.5 |
HIP 49890 |
26.20 |
| 2026-02-07 00:00 |
10:13:08.56 |
-36:25:03.9 |
HIP 49890 |
25.20 |
| 2026-02-07 12:00 |
10:13:03.36 |
-36:24:59.0 |
HIP 49890 |
24.19 |
| 2026-02-08 00:00 |
10:12:58.15 |
-36:24:53.6 |
HIP 49890 |
23.19 |
| 2026-02-08 12:00 |
10:12:52.93 |
-36:24:47.7 |
HIP 49890 |
22.18 |
| 2026-02-09 00:00 |
10:12:47.70 |
-36:24:41.4 |
HIP 49890 |
21.18 |
| 2026-02-09 12:00 |
10:12:42.46 |
-36:24:34.7 |
HIP 49890 |
20.18 |
| 2026-02-10 00:00 |
10:12:37.21 |
-36:24:27.5 |
HIP 49890 |
19.17 |
| 2026-02-10 12:00 |
10:12:31.96 |
-36:24:19.9 |
HIP 49890 |
18.17 |
| 2026-02-11 00:00 |
10:12:26.69 |
-36:24:11.9 |
HIP 49890 |
17.18 |
| 2026-02-11 12:00 |
10:12:21.42 |
-36:24:03.4 |
HIP 49890 |
16.18 |
| 2026-02-12 00:00 |
10:12:16.15 |
-36:23:54.5 |
HIP 49890 |
15.20 |
| 2026-02-12 12:00 |
10:12:10.86 |
-36:23:45.1 |
HIP 49890 |
14.22 |
| 2026-02-13 00:00 |
10:12:05.57 |
-36:23:35.4 |
HIP 49890 |
13.24 |
| 2026-02-13 12:00 |
10:12:00.28 |
-36:23:25.1 |
HIP 49890 |
12.29 |
| 2026-02-14 00:00 |
10:11:54.98 |
-36:23:14.5 |
HIP 49890 |
11.34 |
| 2026-02-14 12:00 |
10:11:49.68 |
-36:23:03.4 |
HIP 49890 |
10.42 |
| 2026-02-15 00:00 |
10:11:44.37 |
-36:22:51.8 |
HIP 49890 |
9.53 |
| 2026-02-15 12:00 |
10:11:39.06 |
-36:22:39.8 |
HIP 49890 |
8.68 |
| 2026-02-16 00:00 |
10:11:33.74 |
-36:22:27.4 |
HIP 49890 |
7.88 |
| 2026-02-16 12:00 |
10:11:28.42 |
-36:22:14.6 |
HIP 49890 |
7.14 |
| 2026-02-17 00:00 |
10:11:23.10 |
-36:22:01.3 |
HIP 49890 |
6.51 |
| 2026-02-17 12:00 |
10:11:17.78 |
-36:21:47.6 |
HIP 49890 |
6.00 |
| 2026-02-18 00:00 |
10:11:12.46 |
-36:21:33.5 |
HIP 49890 |
5.65 |
| 2026-02-18 12:00 |
10:11:07.13 |
-36:21:19.0 |
HIP 49890 |
5.49 |
| 2026-02-19 00:00 |
10:11:01.81 |
-36:21:04.0 |
HIP 49890 |
5.55 |
| 2026-02-19 12:00 |
10:10:56.48 |
-36:20:48.6 |
HIP 49890 |
5.81 |
| 2026-02-20 00:00 |
10:10:51.16 |
-36:20:32.8 |
HIP 49890 |
6.25 |
| 2026-02-20 12:00 |
10:10:45.84 |
-36:20:16.5 |
HIP 49890 |
6.84 |
| 2026-02-21 00:00 |
10:10:40.51 |
-36:19:59.9 |
HIP 49890 |
7.54 |
| 2026-02-21 12:00 |
10:10:35.19 |
-36:19:42.8 |
HIP 49890 |
8.33 |
| 2026-02-22 00:00 |
10:10:29.88 |
-36:19:25.3 |
HIP 49890 |
9.18 |
| 2026-02-22 12:00 |
10:10:24.56 |
-36:19:07.4 |
HIP 49890 |
10.08 |
| 2026-02-23 00:00 |
10:10:19.25 |
-36:18:49.0 |
HIP 49890 |
11.02 |
| 2026-02-23 12:00 |
10:10:13.94 |
-36:18:30.3 |
HIP 49890 |
11.98 |
| 2026-02-24 00:00 |
10:10:08.64 |
-36:18:11.1 |
HIP 49890 |
12.97 |