C/2004 L1 (LINEAR)
| Parameter |
Value |
| Designation |
C/2004 L1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-03-30T02:35:39.649920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:41Z |
| Obs used |
410 |
| NEO |
- |
| M1 |
12.600 |
| K1 |
7.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2005-01-20.0000000 |
| e |
0.99761858 |
| q (au) |
2.047414 |
| a (au) |
859.745847 |
| i (deg) |
159.360856 |
| Ω (om, deg) |
66.174158 |
| ω (w, deg) |
243.579121 |
| M (ma, deg) |
359.997298 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.412 + 2.327\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.412 |
| n |
2.327 |
| gf |
0.970 |
| gb |
-0.915 |
| k |
1.000 |
| δ90 |
9.345 |
| 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 |
01:28:05.40 |
+22:36:55.2 |
HIP 6966 |
25.45 |
| 2026-02-03 12:00 |
01:28:06.26 |
+22:36:50.8 |
HIP 6966 |
25.32 |
| 2026-02-04 00:00 |
01:28:07.14 |
+22:36:46.6 |
HIP 6966 |
25.18 |
| 2026-02-04 12:00 |
01:28:08.05 |
+22:36:42.5 |
HIP 6966 |
25.03 |
| 2026-02-05 00:00 |
01:28:08.99 |
+22:36:38.6 |
HIP 6966 |
24.88 |
| 2026-02-05 12:00 |
01:28:09.94 |
+22:36:34.9 |
HIP 6966 |
24.73 |
| 2026-02-06 00:00 |
01:28:10.92 |
+22:36:31.3 |
HIP 6966 |
24.57 |
| 2026-02-06 12:00 |
01:28:11.93 |
+22:36:27.9 |
HIP 6966 |
24.40 |
| 2026-02-07 00:00 |
01:28:12.95 |
+22:36:24.6 |
HIP 6966 |
24.23 |
| 2026-02-07 12:00 |
01:28:14.00 |
+22:36:21.5 |
HIP 6966 |
24.06 |
| 2026-02-08 00:00 |
01:28:15.08 |
+22:36:18.6 |
HIP 6966 |
23.88 |
| 2026-02-08 12:00 |
01:28:16.17 |
+22:36:15.8 |
HIP 6966 |
23.69 |
| 2026-02-09 00:00 |
01:28:17.29 |
+22:36:13.2 |
HIP 6966 |
23.50 |
| 2026-02-09 12:00 |
01:28:18.43 |
+22:36:10.8 |
HIP 6966 |
23.31 |
| 2026-02-10 00:00 |
01:28:19.59 |
+22:36:08.5 |
HIP 6966 |
23.12 |
| 2026-02-10 12:00 |
01:28:20.78 |
+22:36:06.4 |
HIP 6966 |
22.91 |
| 2026-02-11 00:00 |
01:28:21.99 |
+22:36:04.4 |
HIP 6966 |
22.71 |
| 2026-02-11 12:00 |
01:28:23.22 |
+22:36:02.6 |
HIP 6966 |
22.50 |
| 2026-02-12 00:00 |
01:28:24.47 |
+22:36:01.0 |
HIP 6966 |
22.28 |
| 2026-02-12 12:00 |
01:28:25.75 |
+22:35:59.6 |
HIP 6966 |
22.07 |
| 2026-02-13 00:00 |
01:28:27.04 |
+22:35:58.3 |
HIP 6966 |
21.85 |
| 2026-02-13 12:00 |
01:28:28.36 |
+22:35:57.1 |
HIP 6966 |
21.62 |
| 2026-02-14 00:00 |
01:28:29.70 |
+22:35:56.2 |
HIP 6966 |
21.39 |
| 2026-02-14 12:00 |
01:28:31.06 |
+22:35:55.4 |
HIP 6966 |
21.16 |
| 2026-02-15 00:00 |
01:28:32.45 |
+22:35:54.7 |
HIP 6966 |
20.92 |
| 2026-02-15 12:00 |
01:28:33.85 |
+22:35:54.2 |
HIP 6966 |
20.68 |
| 2026-02-16 00:00 |
01:28:35.28 |
+22:35:53.9 |
HIP 6966 |
20.44 |
| 2026-02-16 12:00 |
01:28:36.72 |
+22:35:53.8 |
HIP 6966 |
20.20 |
| 2026-02-17 00:00 |
01:28:38.19 |
+22:35:53.8 |
HIP 6966 |
19.95 |
| 2026-02-17 12:00 |
01:28:39.68 |
+22:35:54.0 |
HIP 6966 |
19.70 |
| 2026-02-18 00:00 |
01:28:41.19 |
+22:35:54.3 |
HIP 6966 |
19.45 |
| 2026-02-18 12:00 |
01:28:42.72 |
+22:35:54.8 |
HIP 6966 |
19.19 |
| 2026-02-19 00:00 |
01:28:44.26 |
+22:35:55.5 |
HIP 6966 |
18.93 |
| 2026-02-19 12:00 |
01:28:45.83 |
+22:35:56.3 |
HIP 6966 |
18.68 |
| 2026-02-20 00:00 |
01:28:47.42 |
+22:35:57.3 |
HIP 6966 |
18.41 |
| 2026-02-20 12:00 |
01:28:49.03 |
+22:35:58.4 |
HIP 6966 |
18.15 |
| 2026-02-21 00:00 |
01:28:50.66 |
+22:35:59.7 |
HIP 6966 |
17.89 |
| 2026-02-21 12:00 |
01:28:52.31 |
+22:36:01.2 |
HIP 6966 |
17.63 |
| 2026-02-22 00:00 |
01:28:53.98 |
+22:36:02.8 |
HIP 6966 |
17.36 |
| 2026-02-22 12:00 |
01:28:55.66 |
+22:36:04.6 |
HIP 6966 |
17.10 |
| 2026-02-23 00:00 |
01:28:57.37 |
+22:36:06.5 |
HIP 6966 |
16.83 |
| 2026-02-23 12:00 |
01:28:59.09 |
+22:36:08.6 |
HIP 6966 |
16.57 |
| 2026-02-24 00:00 |
01:29:00.83 |
+22:36:10.9 |
HIP 6966 |
16.31 |