| Parameter |
Value |
| Designation |
C/2003 L2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2004-01-19T04:34:34.224960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:31Z |
| Obs used |
492 |
| NEO |
- |
| M1 |
12.700 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2003-09-17.0000000 |
| e |
0.98145123 |
| q (au) |
2.864798 |
| a (au) |
154.446795 |
| i (deg) |
82.051084 |
| Ω (om, deg) |
273.559217 |
| ω (w, deg) |
119.840959 |
| M (ma, deg) |
359.936229 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.617 + 3.294\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.617 |
| n |
3.294 |
| gf |
1.000 |
| gb |
-0.817 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
07:34:41.33 |
-66:23:44.6 |
HIP 36866 |
14.90 |
| 2026-09-20 12:00 |
07:34:44.31 |
-66:24:26.4 |
HIP 36866 |
14.20 |
| 2026-09-21 00:00 |
07:34:47.24 |
-66:25:08.3 |
HIP 36866 |
13.51 |
| 2026-09-21 12:00 |
07:34:50.11 |
-66:25:50.4 |
HIP 36866 |
12.82 |
| 2026-09-22 00:00 |
07:34:52.94 |
-66:26:32.6 |
HIP 36866 |
12.13 |
| 2026-09-22 12:00 |
07:34:55.70 |
-66:27:14.9 |
HIP 36866 |
11.45 |
| 2026-09-23 00:00 |
07:34:58.42 |
-66:27:57.4 |
HIP 36866 |
10.78 |
| 2026-09-23 12:00 |
07:35:01.08 |
-66:28:40.0 |
HIP 36866 |
10.11 |
| 2026-09-24 00:00 |
07:35:03.69 |
-66:29:22.7 |
HIP 36866 |
9.46 |
| 2026-09-24 12:00 |
07:35:06.24 |
-66:30:05.6 |
HIP 36866 |
8.82 |
| 2026-09-25 00:00 |
07:35:08.74 |
-66:30:48.6 |
HIP 36866 |
8.20 |
| 2026-09-25 12:00 |
07:35:11.18 |
-66:31:31.7 |
HIP 36866 |
7.60 |
| 2026-09-26 00:00 |
07:35:13.57 |
-66:32:14.9 |
HIP 36866 |
7.02 |
| 2026-09-26 12:00 |
07:35:15.90 |
-66:32:58.2 |
HIP 36866 |
6.48 |
| 2026-09-27 00:00 |
07:35:18.18 |
-66:33:41.7 |
HIP 36866 |
5.98 |
| 2026-09-27 12:00 |
07:35:20.41 |
-66:34:25.2 |
HIP 36866 |
5.53 |
| 2026-09-28 00:00 |
07:35:22.57 |
-66:35:08.9 |
HIP 36866 |
5.15 |
| 2026-09-28 12:00 |
07:35:24.68 |
-66:35:52.6 |
HIP 36866 |
4.86 |
| 2026-09-29 00:00 |
07:35:26.74 |
-66:36:36.5 |
HIP 36866 |
4.66 |
| 2026-09-29 12:00 |
07:35:28.74 |
-66:37:20.4 |
HIP 36866 |
4.58 |
| 2026-09-30 00:00 |
07:35:30.68 |
-66:38:04.5 |
HIP 36866 |
4.62 |
| 2026-09-30 12:00 |
07:35:32.56 |
-66:38:48.6 |
HIP 36866 |
4.77 |
| 2026-10-01 00:00 |
07:35:34.39 |
-66:39:32.9 |
HIP 36866 |
5.03 |
| 2026-10-01 12:00 |
07:35:36.16 |
-66:40:17.2 |
HIP 36866 |
5.38 |
| 2026-10-02 00:00 |
07:35:37.87 |
-66:41:01.6 |
HIP 36866 |
5.80 |
| 2026-10-02 12:00 |
07:35:39.52 |
-66:41:46.1 |
HIP 36866 |
6.28 |
| 2026-10-03 00:00 |
07:35:41.12 |
-66:42:30.7 |
HIP 36866 |
6.81 |
| 2026-10-03 12:00 |
07:35:42.66 |
-66:43:15.3 |
HIP 36866 |
7.38 |
| 2026-10-04 00:00 |
07:35:44.13 |
-66:44:00.1 |
HIP 36866 |
7.97 |
| 2026-10-04 12:00 |
07:35:45.55 |
-66:44:44.9 |
HIP 36866 |
8.59 |
| 2026-10-05 00:00 |
07:35:46.91 |
-66:45:29.7 |
HIP 36866 |
9.22 |
| 2026-10-05 12:00 |
07:35:48.21 |
-66:46:14.7 |
HIP 36866 |
9.87 |
| 2026-10-06 00:00 |
07:35:49.45 |
-66:46:59.6 |
HIP 36866 |
10.54 |
| 2026-10-06 12:00 |
07:35:50.63 |
-66:47:44.7 |
HIP 36866 |
11.21 |
| 2026-10-07 00:00 |
07:35:51.75 |
-66:48:29.8 |
HIP 36866 |
11.89 |
| 2026-10-07 12:00 |
07:35:52.81 |
-66:49:15.0 |
HIP 36866 |
12.57 |
| 2026-10-08 00:00 |
07:35:53.81 |
-66:50:00.2 |
HIP 36866 |
13.26 |
| 2026-10-08 12:00 |
07:35:54.75 |
-66:50:45.4 |
HIP 36866 |
13.96 |
| 2026-10-09 00:00 |
07:35:55.63 |
-66:51:30.7 |
HIP 36866 |
14.66 |
| 2026-10-09 12:00 |
07:35:56.44 |
-66:52:16.1 |
HIP 36866 |
15.36 |
| 2026-10-10 00:00 |
07:35:57.20 |
-66:53:01.5 |
HIP 36866 |
16.07 |
| 2026-10-10 12:00 |
07:35:57.89 |
-66:53:46.9 |
HIP 36866 |
16.78 |
| 2026-10-11 00:00 |
07:35:58.52 |
-66:54:32.3 |
HIP 36866 |
17.49 |