| 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) |
| 2026-03-26 00:00 |
07:07:09.76 |
-67:00:23.9 |
HIP 34308 |
2.25 |
| 2026-03-26 12:00 |
07:07:08.44 |
-66:59:43.0 |
HIP 34308 |
2.40 |
| 2026-03-27 00:00 |
07:07:07.18 |
-66:59:02.1 |
HIP 34308 |
2.73 |
| 2026-03-27 12:00 |
07:07:05.99 |
-66:58:21.1 |
HIP 34308 |
3.19 |
| 2026-03-28 00:00 |
07:07:04.87 |
-66:57:40.0 |
HIP 34308 |
3.72 |
| 2026-03-28 12:00 |
07:07:03.81 |
-66:56:58.9 |
HIP 34308 |
4.30 |
| 2026-03-29 00:00 |
07:07:02.81 |
-66:56:17.8 |
HIP 34308 |
4.91 |
| 2026-03-29 12:00 |
07:07:01.88 |
-66:55:36.6 |
HIP 34308 |
5.54 |
| 2026-03-30 00:00 |
07:07:01.01 |
-66:54:55.3 |
HIP 34308 |
6.19 |
| 2026-03-30 12:00 |
07:07:00.21 |
-66:54:14.1 |
HIP 34308 |
6.85 |
| 2026-03-31 00:00 |
07:06:59.47 |
-66:53:32.8 |
HIP 34308 |
7.52 |
| 2026-03-31 12:00 |
07:06:58.79 |
-66:52:51.4 |
HIP 34308 |
8.19 |
| 2026-04-01 00:00 |
07:06:58.18 |
-66:52:10.0 |
HIP 34308 |
8.87 |
| 2026-04-01 12:00 |
07:06:57.64 |
-66:51:28.6 |
HIP 34308 |
9.55 |
| 2026-04-02 00:00 |
07:06:57.15 |
-66:50:47.2 |
HIP 34308 |
10.23 |
| 2026-04-02 12:00 |
07:06:56.74 |
-66:50:05.8 |
HIP 34308 |
10.91 |
| 2026-04-03 00:00 |
07:06:56.38 |
-66:49:24.3 |
HIP 34308 |
11.60 |
| 2026-04-03 12:00 |
07:06:56.09 |
-66:48:42.9 |
HIP 34308 |
12.28 |
| 2026-04-04 00:00 |
07:06:55.87 |
-66:48:01.4 |
HIP 34308 |
12.97 |
| 2026-04-04 12:00 |
07:06:55.70 |
-66:47:19.9 |
HIP 34308 |
13.66 |
| 2026-04-05 00:00 |
07:06:55.60 |
-66:46:38.4 |
HIP 34308 |
14.35 |
| 2026-04-05 12:00 |
07:06:55.57 |
-66:45:57.0 |
HIP 34308 |
15.04 |
| 2026-04-06 00:00 |
07:06:55.59 |
-66:45:15.5 |
HIP 34308 |
15.73 |
| 2026-04-06 12:00 |
07:06:55.68 |
-66:44:34.0 |
HIP 34308 |
16.42 |
| 2026-04-07 00:00 |
07:06:55.84 |
-66:43:52.5 |
HIP 34308 |
17.11 |
| 2026-04-07 12:00 |
07:06:56.05 |
-66:43:11.1 |
HIP 34308 |
17.81 |
| 2026-04-08 00:00 |
07:06:56.33 |
-66:42:29.6 |
HIP 34308 |
18.50 |
| 2026-04-08 12:00 |
07:06:56.67 |
-66:41:48.2 |
HIP 34308 |
19.19 |
| 2026-04-09 00:00 |
07:06:57.08 |
-66:41:06.8 |
HIP 34308 |
19.88 |
| 2026-04-09 12:00 |
07:06:57.55 |
-66:40:25.4 |
HIP 34308 |
20.57 |
| 2026-04-10 00:00 |
07:06:58.08 |
-66:39:44.1 |
HIP 34308 |
21.26 |
| 2026-04-10 12:00 |
07:06:58.67 |
-66:39:02.8 |
HIP 34308 |
21.95 |
| 2026-04-11 00:00 |
07:06:59.32 |
-66:38:21.5 |
HIP 34308 |
22.64 |
| 2026-04-11 12:00 |
07:07:00.04 |
-66:37:40.2 |
HIP 34308 |
23.33 |
| 2026-04-12 00:00 |
07:07:00.82 |
-66:36:59.0 |
HIP 34308 |
24.02 |
| 2026-04-12 12:00 |
07:07:01.66 |
-66:36:17.9 |
HIP 34308 |
24.71 |
| 2026-04-13 00:00 |
07:07:02.56 |
-66:35:36.7 |
HIP 34308 |
25.40 |
| 2026-04-13 12:00 |
07:07:03.53 |
-66:34:55.7 |
HIP 34308 |
26.09 |
| 2026-04-14 00:00 |
07:07:04.55 |
-66:34:14.7 |
HIP 34308 |
26.78 |
| 2026-04-14 12:00 |
07:07:05.64 |
-66:33:33.7 |
HIP 34679 |
26.88 |
| 2026-04-15 00:00 |
07:07:06.79 |
-66:32:52.8 |
HIP 34679 |
26.43 |
| 2026-04-15 12:00 |
07:07:08.00 |
-66:32:12.0 |
HIP 34679 |
25.99 |
| 2026-04-16 00:00 |
07:07:09.27 |
-66:31:31.2 |
HIP 34679 |
25.56 |