| 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) |
| 2026-03-26 00:00 |
08:24:30.72 |
-69:16:59.7 |
HIP 40864 |
26.00 |
| 2026-03-26 12:00 |
08:24:26.41 |
-69:16:15.9 |
HIP 40864 |
25.31 |
| 2026-03-27 00:00 |
08:24:22.19 |
-69:15:31.9 |
HIP 40864 |
24.63 |
| 2026-03-27 12:00 |
08:24:18.04 |
-69:14:47.7 |
HIP 40864 |
23.96 |
| 2026-03-28 00:00 |
08:24:13.96 |
-69:14:03.3 |
HIP 40864 |
23.31 |
| 2026-03-28 12:00 |
08:24:09.97 |
-69:13:18.7 |
HIP 40864 |
22.67 |
| 2026-03-29 00:00 |
08:24:06.05 |
-69:12:33.9 |
HIP 40864 |
22.05 |
| 2026-03-29 12:00 |
08:24:02.21 |
-69:11:48.9 |
HIP 40864 |
21.44 |
| 2026-03-30 00:00 |
08:23:58.45 |
-69:11:03.7 |
HIP 40864 |
20.86 |
| 2026-03-30 12:00 |
08:23:54.77 |
-69:10:18.3 |
HIP 40864 |
20.30 |
| 2026-03-31 00:00 |
08:23:51.17 |
-69:09:32.7 |
HIP 40864 |
19.76 |
| 2026-03-31 12:00 |
08:23:47.64 |
-69:08:47.0 |
HIP 40864 |
19.25 |
| 2026-04-01 00:00 |
08:23:44.20 |
-69:08:01.1 |
HIP 40864 |
18.77 |
| 2026-04-01 12:00 |
08:23:40.83 |
-69:07:15.0 |
HIP 40864 |
18.32 |
| 2026-04-02 00:00 |
08:23:37.55 |
-69:06:28.7 |
HIP 40864 |
17.90 |
| 2026-04-02 12:00 |
08:23:34.34 |
-69:05:42.3 |
HIP 40864 |
17.51 |
| 2026-04-03 00:00 |
08:23:31.21 |
-69:04:55.7 |
HIP 40864 |
17.17 |
| 2026-04-03 12:00 |
08:23:28.16 |
-69:04:08.9 |
HIP 40864 |
16.86 |
| 2026-04-04 00:00 |
08:23:25.19 |
-69:03:22.0 |
HIP 40864 |
16.60 |
| 2026-04-04 12:00 |
08:23:22.30 |
-69:02:35.0 |
HIP 40864 |
16.38 |
| 2026-04-05 00:00 |
08:23:19.49 |
-69:01:47.8 |
HIP 40864 |
16.21 |
| 2026-04-05 12:00 |
08:23:16.76 |
-69:01:00.5 |
HIP 40864 |
16.08 |
| 2026-04-06 00:00 |
08:23:14.11 |
-69:00:13.0 |
HIP 40864 |
16.00 |
| 2026-04-06 12:00 |
08:23:11.54 |
-68:59:25.4 |
HIP 40864 |
15.98 |
| 2026-04-07 00:00 |
08:23:09.05 |
-68:58:37.6 |
HIP 40864 |
16.00 |
| 2026-04-07 12:00 |
08:23:06.64 |
-68:57:49.8 |
HIP 40864 |
16.07 |
| 2026-04-08 00:00 |
08:23:04.31 |
-68:57:01.8 |
HIP 40864 |
16.19 |
| 2026-04-08 12:00 |
08:23:02.07 |
-68:56:13.7 |
HIP 40864 |
16.36 |
| 2026-04-09 00:00 |
08:22:59.90 |
-68:55:25.4 |
HIP 40864 |
16.58 |
| 2026-04-09 12:00 |
08:22:57.81 |
-68:54:37.1 |
HIP 40864 |
16.84 |
| 2026-04-10 00:00 |
08:22:55.80 |
-68:53:48.7 |
HIP 40864 |
17.14 |
| 2026-04-10 12:00 |
08:22:53.87 |
-68:53:00.1 |
HIP 40864 |
17.49 |
| 2026-04-11 00:00 |
08:22:52.02 |
-68:52:11.5 |
HIP 40864 |
17.87 |
| 2026-04-11 12:00 |
08:22:50.26 |
-68:51:22.7 |
HIP 40864 |
18.29 |
| 2026-04-12 00:00 |
08:22:48.57 |
-68:50:33.9 |
HIP 40864 |
18.74 |
| 2026-04-12 12:00 |
08:22:46.96 |
-68:49:45.0 |
HIP 40864 |
19.22 |
| 2026-04-13 00:00 |
08:22:45.44 |
-68:48:56.0 |
HIP 40864 |
19.73 |
| 2026-04-13 12:00 |
08:22:44.00 |
-68:48:06.9 |
HIP 40864 |
20.27 |
| 2026-04-14 00:00 |
08:22:42.63 |
-68:47:17.7 |
HIP 40864 |
20.83 |
| 2026-04-14 12:00 |
08:22:41.35 |
-68:46:28.5 |
HIP 40864 |
21.42 |
| 2026-04-15 00:00 |
08:22:40.15 |
-68:45:39.2 |
HIP 40794 |
21.91 |
| 2026-04-15 12:00 |
08:22:39.02 |
-68:44:49.8 |
HIP 40794 |
22.37 |
| 2026-04-16 00:00 |
08:22:37.98 |
-68:44:00.4 |
HIP 40794 |
22.85 |