C/2003 L2 (LINEAR)
| 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 |
0.995 |
| gb |
-0.618 |
| 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) |
| 2026-02-03 00:00 |
07:14:40.61 |
-67:54:19.3 |
HIP 35052 |
10.04 |
| 2026-02-03 12:00 |
07:14:33.68 |
-67:54:01.7 |
HIP 35052 |
10.44 |
| 2026-02-04 00:00 |
07:14:26.77 |
-67:53:43.8 |
HIP 35052 |
10.88 |
| 2026-02-04 12:00 |
07:14:19.91 |
-67:53:25.6 |
HIP 35052 |
11.35 |
| 2026-02-05 00:00 |
07:14:13.08 |
-67:53:07.0 |
HIP 35052 |
11.85 |
| 2026-02-05 12:00 |
07:14:06.28 |
-67:52:48.0 |
HIP 34805 |
11.83 |
| 2026-02-06 00:00 |
07:13:59.52 |
-67:52:28.6 |
HIP 34805 |
11.12 |
| 2026-02-06 12:00 |
07:13:52.80 |
-67:52:08.9 |
HIP 34805 |
10.41 |
| 2026-02-07 00:00 |
07:13:46.12 |
-67:51:48.9 |
HIP 34805 |
9.70 |
| 2026-02-07 12:00 |
07:13:39.47 |
-67:51:28.5 |
HIP 34805 |
8.98 |
| 2026-02-08 00:00 |
07:13:32.87 |
-67:51:07.7 |
HIP 34805 |
8.27 |
| 2026-02-08 12:00 |
07:13:26.30 |
-67:50:46.6 |
HIP 34805 |
7.56 |
| 2026-02-09 00:00 |
07:13:19.77 |
-67:50:25.2 |
HIP 34805 |
6.85 |
| 2026-02-09 12:00 |
07:13:13.28 |
-67:50:03.4 |
HIP 34805 |
6.14 |
| 2026-02-10 00:00 |
07:13:06.84 |
-67:49:41.3 |
HIP 34805 |
5.43 |
| 2026-02-10 12:00 |
07:13:00.44 |
-67:49:18.8 |
HIP 34805 |
4.72 |
| 2026-02-11 00:00 |
07:12:54.07 |
-67:48:56.0 |
HIP 34805 |
4.01 |
| 2026-02-11 12:00 |
07:12:47.76 |
-67:48:32.9 |
HIP 34805 |
3.30 |
| 2026-02-12 00:00 |
07:12:41.48 |
-67:48:09.4 |
HIP 34805 |
2.59 |
| 2026-02-12 12:00 |
07:12:35.25 |
-67:47:45.6 |
HIP 34805 |
1.88 |
| 2026-02-13 00:00 |
07:12:29.06 |
-67:47:21.4 |
HIP 34805 |
1.19 |
| 2026-02-13 12:00 |
07:12:22.92 |
-67:46:57.0 |
HIP 34805 |
0.53 |
| 2026-02-14 00:00 |
07:12:16.82 |
-67:46:32.2 |
HIP 34805 |
0.40 |
| 2026-02-14 12:00 |
07:12:10.77 |
-67:46:07.1 |
HIP 34805 |
1.03 |
| 2026-02-15 00:00 |
07:12:04.77 |
-67:45:41.7 |
HIP 34805 |
1.72 |
| 2026-02-15 12:00 |
07:11:58.81 |
-67:45:15.9 |
HIP 34805 |
2.42 |
| 2026-02-16 00:00 |
07:11:52.91 |
-67:44:49.9 |
HIP 34805 |
3.12 |
| 2026-02-16 12:00 |
07:11:47.04 |
-67:44:23.5 |
HIP 34805 |
3.83 |
| 2026-02-17 00:00 |
07:11:41.23 |
-67:43:56.8 |
HIP 34805 |
4.54 |
| 2026-02-17 12:00 |
07:11:35.47 |
-67:43:29.8 |
HIP 34805 |
5.25 |
| 2026-02-18 00:00 |
07:11:29.76 |
-67:43:02.6 |
HIP 34805 |
5.95 |
| 2026-02-18 12:00 |
07:11:24.09 |
-67:42:35.0 |
HIP 34805 |
6.66 |
| 2026-02-19 00:00 |
07:11:18.48 |
-67:42:07.1 |
HIP 34805 |
7.37 |
| 2026-02-19 12:00 |
07:11:12.92 |
-67:41:38.9 |
HIP 34805 |
8.07 |
| 2026-02-20 00:00 |
07:11:07.41 |
-67:41:10.5 |
HIP 34805 |
8.78 |
| 2026-02-20 12:00 |
07:11:01.95 |
-67:40:41.7 |
HIP 34805 |
9.48 |
| 2026-02-21 00:00 |
07:10:56.55 |
-67:40:12.7 |
HIP 34805 |
10.19 |
| 2026-02-21 12:00 |
07:10:51.19 |
-67:39:43.4 |
HIP 34805 |
10.89 |
| 2026-02-22 00:00 |
07:10:45.89 |
-67:39:13.8 |
HIP 34805 |
11.60 |
| 2026-02-22 12:00 |
07:10:40.65 |
-67:38:43.9 |
HIP 34805 |
12.30 |
| 2026-02-23 00:00 |
07:10:35.45 |
-67:38:13.8 |
HIP 34805 |
13.00 |
| 2026-02-23 12:00 |
07:10:30.32 |
-67:37:43.3 |
HIP 34805 |
13.71 |
| 2026-02-24 00:00 |
07:10:25.23 |
-67:37:12.7 |
HIP 34805 |
14.41 |