| Parameter |
Value |
| Designation |
C/2003 W1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2003-11-09T11:06:46.327680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:35Z |
| Obs used |
95 |
| NEO |
- |
| M1 |
16.400 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2003-12-06.0000000 |
| e |
0.93434870 |
| q (au) |
1.652421 |
| a (au) |
25.169668 |
| i (deg) |
78.075971 |
| Ω (om, deg) |
256.742634 |
| ω (w, deg) |
113.288697 |
| M (ma, deg) |
0.207128 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.601 + 4.976\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.601 |
| n |
4.976 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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 |
08:54:40.41 |
-67:30:41.8 |
HIP 43803 |
15.17 |
| 2026-09-20 12:00 |
08:54:46.57 |
-67:31:21.0 |
HIP 43803 |
15.69 |
| 2026-09-21 00:00 |
08:54:52.69 |
-67:32:00.4 |
HIP 43803 |
16.24 |
| 2026-09-21 12:00 |
08:54:58.76 |
-67:32:40.1 |
HIP 43803 |
16.83 |
| 2026-09-22 00:00 |
08:55:04.78 |
-67:33:20.1 |
HIP 43803 |
17.44 |
| 2026-09-22 12:00 |
08:55:10.75 |
-67:34:00.3 |
HIP 43803 |
18.08 |
| 2026-09-23 00:00 |
08:55:16.68 |
-67:34:40.8 |
HIP 43803 |
18.75 |
| 2026-09-23 12:00 |
08:55:22.55 |
-67:35:21.6 |
HIP 43803 |
19.44 |
| 2026-09-24 00:00 |
08:55:28.37 |
-67:36:02.6 |
HIP 43803 |
20.14 |
| 2026-09-24 12:00 |
08:55:34.15 |
-67:36:43.8 |
HIP 43803 |
20.87 |
| 2026-09-25 00:00 |
08:55:39.87 |
-67:37:25.4 |
HIP 43803 |
21.60 |
| 2026-09-25 12:00 |
08:55:45.54 |
-67:38:07.1 |
HIP 43803 |
22.36 |
| 2026-09-26 00:00 |
08:55:51.16 |
-67:38:49.2 |
HIP 43941 |
22.86 |
| 2026-09-26 12:00 |
08:55:56.73 |
-67:39:31.4 |
HIP 43941 |
23.39 |
| 2026-09-27 00:00 |
08:56:02.25 |
-67:40:13.9 |
HIP 43941 |
23.95 |
| 2026-09-27 12:00 |
08:56:07.71 |
-67:40:56.7 |
HIP 43941 |
24.53 |
| 2026-09-28 00:00 |
08:56:13.13 |
-67:41:39.7 |
HIP 43941 |
25.13 |
| 2026-09-28 12:00 |
08:56:18.48 |
-67:42:22.9 |
HIP 43941 |
25.76 |
| 2026-09-29 00:00 |
08:56:23.79 |
-67:43:06.3 |
HIP 43941 |
26.40 |
| 2026-09-29 12:00 |
08:56:29.04 |
-67:43:50.0 |
HIP 44241 |
26.38 |
| 2026-09-30 00:00 |
08:56:34.24 |
-67:44:33.9 |
HIP 44241 |
25.59 |
| 2026-09-30 12:00 |
08:56:39.38 |
-67:45:18.1 |
HIP 44241 |
24.82 |
| 2026-10-01 00:00 |
08:56:44.47 |
-67:46:02.4 |
HIP 44241 |
24.06 |
| 2026-10-01 12:00 |
08:56:49.50 |
-67:46:47.0 |
HIP 44241 |
23.31 |
| 2026-10-02 00:00 |
08:56:54.47 |
-67:47:31.9 |
HIP 44241 |
22.57 |
| 2026-10-02 12:00 |
08:56:59.39 |
-67:48:16.9 |
HIP 44241 |
21.85 |
| 2026-10-03 00:00 |
08:57:04.25 |
-67:49:02.1 |
HIP 44241 |
21.14 |
| 2026-10-03 12:00 |
08:57:09.05 |
-67:49:47.6 |
HIP 44241 |
20.46 |
| 2026-10-04 00:00 |
08:57:13.80 |
-67:50:33.2 |
HIP 44241 |
19.79 |
| 2026-10-04 12:00 |
08:57:18.49 |
-67:51:19.1 |
HIP 44241 |
19.14 |
| 2026-10-05 00:00 |
08:57:23.12 |
-67:52:05.2 |
HIP 44099 |
18.44 |
| 2026-10-05 12:00 |
08:57:27.69 |
-67:52:51.5 |
HIP 44099 |
17.56 |
| 2026-10-06 00:00 |
08:57:32.20 |
-67:53:37.9 |
HIP 44099 |
16.67 |
| 2026-10-06 12:00 |
08:57:36.65 |
-67:54:24.6 |
HIP 44099 |
15.79 |
| 2026-10-07 00:00 |
08:57:41.04 |
-67:55:11.5 |
HIP 44099 |
14.91 |
| 2026-10-07 12:00 |
08:57:45.37 |
-67:55:58.5 |
HIP 44099 |
14.02 |
| 2026-10-08 00:00 |
08:57:49.64 |
-67:56:45.8 |
HIP 44099 |
13.14 |
| 2026-10-08 12:00 |
08:57:53.84 |
-67:57:33.2 |
HIP 44099 |
12.26 |
| 2026-10-09 00:00 |
08:57:57.99 |
-67:58:20.8 |
HIP 44099 |
11.37 |
| 2026-10-09 12:00 |
08:58:02.07 |
-67:59:08.6 |
HIP 44099 |
10.49 |
| 2026-10-10 00:00 |
08:58:06.09 |
-67:59:56.6 |
HIP 44099 |
9.61 |
| 2026-10-10 12:00 |
08:58:10.04 |
-68:00:44.7 |
HIP 44099 |
8.73 |
| 2026-10-11 00:00 |
08:58:13.93 |
-68:01:33.0 |
HIP 44099 |
7.85 |