| 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) |
| 2026-06-01 00:00 |
10:00:43.40 |
-34:07:09.4 |
HIP 49165 |
16.27 |
| 2026-06-01 12:00 |
10:00:43.97 |
-34:06:29.5 |
HIP 49165 |
16.31 |
| 2026-06-02 00:00 |
10:00:44.57 |
-34:05:49.8 |
HIP 49165 |
16.36 |
| 2026-06-02 12:00 |
10:00:45.21 |
-34:05:10.3 |
HIP 49165 |
16.43 |
| 2026-06-03 00:00 |
10:00:45.89 |
-34:04:31.0 |
HIP 49165 |
16.52 |
| 2026-06-03 12:00 |
10:00:46.60 |
-34:03:52.0 |
HIP 49165 |
16.63 |
| 2026-06-04 00:00 |
10:00:47.35 |
-34:03:13.2 |
HIP 49165 |
16.76 |
| 2026-06-04 12:00 |
10:00:48.13 |
-34:02:34.6 |
HIP 49165 |
16.90 |
| 2026-06-05 00:00 |
10:00:48.95 |
-34:01:56.2 |
HIP 49165 |
17.06 |
| 2026-06-05 12:00 |
10:00:49.80 |
-34:01:18.1 |
HIP 49165 |
17.24 |
| 2026-06-06 00:00 |
10:00:50.70 |
-34:00:40.2 |
HIP 49165 |
17.43 |
| 2026-06-06 12:00 |
10:00:51.62 |
-34:00:02.6 |
HIP 49165 |
17.63 |
| 2026-06-07 00:00 |
10:00:52.58 |
-33:59:25.2 |
HIP 49165 |
17.85 |
| 2026-06-07 12:00 |
10:00:53.58 |
-33:58:48.0 |
HIP 49165 |
18.08 |
| 2026-06-08 00:00 |
10:00:54.61 |
-33:58:11.1 |
HIP 49165 |
18.32 |
| 2026-06-08 12:00 |
10:00:55.68 |
-33:57:34.4 |
HIP 49165 |
18.57 |
| 2026-06-09 00:00 |
10:00:56.79 |
-33:56:58.0 |
HIP 49165 |
18.84 |
| 2026-06-09 12:00 |
10:00:57.92 |
-33:56:21.8 |
HIP 49165 |
19.11 |
| 2026-06-10 00:00 |
10:00:59.09 |
-33:55:45.9 |
HIP 49165 |
19.40 |
| 2026-06-10 12:00 |
10:01:00.30 |
-33:55:10.3 |
HIP 49166 |
18.87 |
| 2026-06-11 00:00 |
10:01:01.54 |
-33:54:34.9 |
HIP 49166 |
18.26 |
| 2026-06-11 12:00 |
10:01:02.82 |
-33:53:59.8 |
HIP 49166 |
17.65 |
| 2026-06-12 00:00 |
10:01:04.13 |
-33:53:24.9 |
HIP 49166 |
17.04 |
| 2026-06-12 12:00 |
10:01:05.47 |
-33:52:50.4 |
HIP 49166 |
16.43 |
| 2026-06-13 00:00 |
10:01:06.85 |
-33:52:16.0 |
HIP 49166 |
15.83 |
| 2026-06-13 12:00 |
10:01:08.26 |
-33:51:42.0 |
HIP 49166 |
15.22 |
| 2026-06-14 00:00 |
10:01:09.71 |
-33:51:08.2 |
HIP 49166 |
14.61 |
| 2026-06-14 12:00 |
10:01:11.18 |
-33:50:34.7 |
HIP 49166 |
14.01 |
| 2026-06-15 00:00 |
10:01:12.69 |
-33:50:01.5 |
HIP 49166 |
13.41 |
| 2026-06-15 12:00 |
10:01:14.24 |
-33:49:28.6 |
HIP 49166 |
12.80 |
| 2026-06-16 00:00 |
10:01:15.82 |
-33:48:55.9 |
HIP 49166 |
12.20 |
| 2026-06-16 12:00 |
10:01:17.43 |
-33:48:23.6 |
HIP 49166 |
11.60 |
| 2026-06-17 00:00 |
10:01:19.07 |
-33:47:51.5 |
HIP 49166 |
11.00 |
| 2026-06-17 12:00 |
10:01:20.74 |
-33:47:19.7 |
HIP 49166 |
10.41 |
| 2026-06-18 00:00 |
10:01:22.45 |
-33:46:48.2 |
HIP 49166 |
9.81 |
| 2026-06-18 12:00 |
10:01:24.19 |
-33:46:17.0 |
HIP 49166 |
9.22 |
| 2026-06-19 00:00 |
10:01:25.96 |
-33:45:46.1 |
HIP 49166 |
8.63 |
| 2026-06-19 12:00 |
10:01:27.76 |
-33:45:15.5 |
HIP 49166 |
8.04 |
| 2026-06-20 00:00 |
10:01:29.59 |
-33:44:45.2 |
HIP 49166 |
7.46 |
| 2026-06-20 12:00 |
10:01:31.45 |
-33:44:15.2 |
HIP 49166 |
6.88 |
| 2026-06-21 00:00 |
10:01:33.35 |
-33:43:45.5 |
HIP 49166 |
6.31 |
| 2026-06-21 12:00 |
10:01:35.27 |
-33:43:16.1 |
HIP 49166 |
5.75 |
| 2026-06-22 00:00 |
10:01:37.23 |
-33:42:47.0 |
HIP 49166 |
5.20 |