| Parameter |
Value |
| Designation |
C/2004 L2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-11-15T02:27:00.152640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:42Z |
| Obs used |
303 |
| NEO |
- |
| M1 |
8.000 |
| K1 |
9.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2005-11-03.0000000 |
| e |
0.99521643 |
| q (au) |
3.778628 |
| a (au) |
789.918609 |
| i (deg) |
62.518634 |
| Ω (om, deg) |
99.180087 |
| ω (w, deg) |
257.311401 |
| M (ma, deg) |
359.999463 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.775 + 2.485\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.775 |
| n |
2.485 |
| gf |
0.916 |
| gb |
-0.978 |
| k |
1.000 |
| δ90 |
9.940 |
| 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 |
09:11:52.42 |
+53:30:48.4 |
HIP 45397 |
28.76 |
| 2026-09-20 12:00 |
09:11:56.25 |
+53:31:00.8 |
HIP 45397 |
28.20 |
| 2026-09-21 00:00 |
09:12:00.05 |
+53:31:13.4 |
HIP 45397 |
27.65 |
| 2026-09-21 12:00 |
09:12:03.82 |
+53:31:26.3 |
HIP 45397 |
27.10 |
| 2026-09-22 00:00 |
09:12:07.57 |
+53:31:39.4 |
HIP 45397 |
26.56 |
| 2026-09-22 12:00 |
09:12:11.29 |
+53:31:52.7 |
HIP 45397 |
26.03 |
| 2026-09-23 00:00 |
09:12:14.98 |
+53:32:06.2 |
HIP 45397 |
25.51 |
| 2026-09-23 12:00 |
09:12:18.65 |
+53:32:20.0 |
HIP 45397 |
24.99 |
| 2026-09-24 00:00 |
09:12:22.29 |
+53:32:34.0 |
HIP 45397 |
24.48 |
| 2026-09-24 12:00 |
09:12:25.90 |
+53:32:48.2 |
HIP 45397 |
23.98 |
| 2026-09-25 00:00 |
09:12:29.48 |
+53:33:02.6 |
HIP 45397 |
23.49 |
| 2026-09-25 12:00 |
09:12:33.04 |
+53:33:17.3 |
HIP 45397 |
23.01 |
| 2026-09-26 00:00 |
09:12:36.56 |
+53:33:32.1 |
HIP 45397 |
22.53 |
| 2026-09-26 12:00 |
09:12:40.06 |
+53:33:47.2 |
HIP 45397 |
22.07 |
| 2026-09-27 00:00 |
09:12:43.53 |
+53:34:02.5 |
HIP 45397 |
21.62 |
| 2026-09-27 12:00 |
09:12:46.97 |
+53:34:18.1 |
HIP 45397 |
21.18 |
| 2026-09-28 00:00 |
09:12:50.38 |
+53:34:33.8 |
HIP 45397 |
20.75 |
| 2026-09-28 12:00 |
09:12:53.76 |
+53:34:49.8 |
HIP 45397 |
20.33 |
| 2026-09-29 00:00 |
09:12:57.12 |
+53:35:06.0 |
HIP 45397 |
19.93 |
| 2026-09-29 12:00 |
09:13:00.44 |
+53:35:22.4 |
HIP 45397 |
19.53 |
| 2026-09-30 00:00 |
09:13:03.73 |
+53:35:39.1 |
HIP 45397 |
19.16 |
| 2026-09-30 12:00 |
09:13:06.99 |
+53:35:55.9 |
HIP 45397 |
18.80 |
| 2026-10-01 00:00 |
09:13:10.22 |
+53:36:13.0 |
HIP 45397 |
18.45 |
| 2026-10-01 12:00 |
09:13:13.42 |
+53:36:30.3 |
HIP 45397 |
18.12 |
| 2026-10-02 00:00 |
09:13:16.59 |
+53:36:47.8 |
HIP 45397 |
17.80 |
| 2026-10-02 12:00 |
09:13:19.73 |
+53:37:05.5 |
HIP 45397 |
17.51 |
| 2026-10-03 00:00 |
09:13:22.84 |
+53:37:23.4 |
HIP 45397 |
17.23 |
| 2026-10-03 12:00 |
09:13:25.91 |
+53:37:41.5 |
HIP 45397 |
16.97 |
| 2026-10-04 00:00 |
09:13:28.95 |
+53:37:59.9 |
HIP 45397 |
16.74 |
| 2026-10-04 12:00 |
09:13:31.96 |
+53:38:18.4 |
HIP 45397 |
16.52 |
| 2026-10-05 00:00 |
09:13:34.94 |
+53:38:37.2 |
HIP 45397 |
16.32 |
| 2026-10-05 12:00 |
09:13:37.89 |
+53:38:56.2 |
HIP 45397 |
16.15 |
| 2026-10-06 00:00 |
09:13:40.80 |
+53:39:15.4 |
HIP 45397 |
16.00 |
| 2026-10-06 12:00 |
09:13:43.68 |
+53:39:34.8 |
HIP 45397 |
15.87 |
| 2026-10-07 00:00 |
09:13:46.52 |
+53:39:54.4 |
HIP 45397 |
15.76 |
| 2026-10-07 12:00 |
09:13:49.33 |
+53:40:14.2 |
HIP 45397 |
15.68 |
| 2026-10-08 00:00 |
09:13:52.11 |
+53:40:34.3 |
HIP 45397 |
15.62 |
| 2026-10-08 12:00 |
09:13:54.85 |
+53:40:54.5 |
HIP 45397 |
15.59 |
| 2026-10-09 00:00 |
09:13:57.56 |
+53:41:14.9 |
HIP 45397 |
15.58 |
| 2026-10-09 12:00 |
09:14:00.24 |
+53:41:35.6 |
HIP 45397 |
15.59 |
| 2026-10-10 00:00 |
09:14:02.87 |
+53:41:56.4 |
HIP 45397 |
15.63 |
| 2026-10-10 12:00 |
09:14:05.48 |
+53:42:17.4 |
HIP 45397 |
15.69 |
| 2026-10-11 00:00 |
09:14:08.05 |
+53:42:38.7 |
HIP 45397 |
15.77 |