| Parameter |
Value |
| Designation |
C/2003 WT42 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2006-04-10T18:20:21.065280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:36Z |
| Obs used |
2466 |
| NEO |
- |
| M1 |
6.200 |
| K1 |
8.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2006-04-09.0000000 |
| e |
1.00258438 |
| q (au) |
5.190924 |
| a (au) |
-2008.572797 |
| i (deg) |
31.410588 |
| Ω (om, deg) |
48.453889 |
| ω (w, deg) |
92.466923 |
| M (ma, deg) |
-0.000019 |
Magnitude
Scatter + Global Linear
$$
M_a = (-0.750 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
-0.750 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2003-12-01 |
2006-04-02 |
-4.0705 |
+3.107 |
| 2006-04-17 |
2007-07-07 |
+16.4914 |
-11.805 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
18:08:37.21 |
-47:00:00.0 |
HIP 88782 |
13.56 |
| 2026-07-29 12:00 |
18:08:33.75 |
-46:59:51.2 |
HIP 88782 |
12.96 |
| 2026-07-30 00:00 |
18:08:30.30 |
-46:59:42.3 |
HIP 88782 |
12.37 |
| 2026-07-30 12:00 |
18:08:26.88 |
-46:59:33.3 |
HIP 88782 |
11.79 |
| 2026-07-31 00:00 |
18:08:23.48 |
-46:59:24.1 |
HIP 88782 |
11.21 |
| 2026-07-31 12:00 |
18:08:20.11 |
-46:59:14.8 |
HIP 88782 |
10.63 |
| 2026-08-01 00:00 |
18:08:16.76 |
-46:59:05.3 |
HIP 88782 |
10.06 |
| 2026-08-01 12:00 |
18:08:13.44 |
-46:58:55.7 |
HIP 88782 |
9.49 |
| 2026-08-02 00:00 |
18:08:10.14 |
-46:58:45.9 |
HIP 88782 |
8.93 |
| 2026-08-02 12:00 |
18:08:06.87 |
-46:58:36.1 |
HIP 88782 |
8.37 |
| 2026-08-03 00:00 |
18:08:03.62 |
-46:58:26.1 |
HIP 88782 |
7.82 |
| 2026-08-03 12:00 |
18:08:00.40 |
-46:58:15.9 |
HIP 88782 |
7.28 |
| 2026-08-04 00:00 |
18:07:57.21 |
-46:58:05.7 |
HIP 88782 |
6.74 |
| 2026-08-04 12:00 |
18:07:54.04 |
-46:57:55.3 |
HIP 88782 |
6.21 |
| 2026-08-05 00:00 |
18:07:50.90 |
-46:57:44.8 |
HIP 88782 |
5.69 |
| 2026-08-05 12:00 |
18:07:47.78 |
-46:57:34.1 |
HIP 88782 |
5.19 |
| 2026-08-06 00:00 |
18:07:44.69 |
-46:57:23.3 |
HIP 88782 |
4.69 |
| 2026-08-06 12:00 |
18:07:41.63 |
-46:57:12.4 |
HIP 88782 |
4.21 |
| 2026-08-07 00:00 |
18:07:38.60 |
-46:57:01.4 |
HIP 88782 |
3.76 |
| 2026-08-07 12:00 |
18:07:35.60 |
-46:56:50.3 |
HIP 88782 |
3.33 |
| 2026-08-08 00:00 |
18:07:32.62 |
-46:56:39.0 |
HIP 88782 |
2.95 |
| 2026-08-08 12:00 |
18:07:29.67 |
-46:56:27.6 |
HIP 88782 |
2.61 |
| 2026-08-09 00:00 |
18:07:26.75 |
-46:56:16.1 |
HIP 88782 |
2.36 |
| 2026-08-09 12:00 |
18:07:23.87 |
-46:56:04.4 |
HIP 88782 |
2.20 |
| 2026-08-10 00:00 |
18:07:21.01 |
-46:55:52.7 |
HIP 88782 |
2.16 |
| 2026-08-10 12:00 |
18:07:18.17 |
-46:55:40.8 |
HIP 88782 |
2.24 |
| 2026-08-11 00:00 |
18:07:15.37 |
-46:55:28.8 |
HIP 88782 |
2.43 |
| 2026-08-11 12:00 |
18:07:12.60 |
-46:55:16.7 |
HIP 88782 |
2.70 |
| 2026-08-12 00:00 |
18:07:09.86 |
-46:55:04.5 |
HIP 88782 |
3.03 |
| 2026-08-12 12:00 |
18:07:07.15 |
-46:54:52.2 |
HIP 88782 |
3.40 |
| 2026-08-13 00:00 |
18:07:04.48 |
-46:54:39.7 |
HIP 88782 |
3.79 |
| 2026-08-13 12:00 |
18:07:01.83 |
-46:54:27.2 |
HIP 88782 |
4.20 |
| 2026-08-14 00:00 |
18:06:59.21 |
-46:54:14.5 |
HIP 88782 |
4.63 |
| 2026-08-14 12:00 |
18:06:56.63 |
-46:54:01.8 |
HIP 88782 |
5.06 |
| 2026-08-15 00:00 |
18:06:54.08 |
-46:53:48.9 |
HIP 88782 |
5.49 |
| 2026-08-15 12:00 |
18:06:51.56 |
-46:53:35.9 |
HIP 88782 |
5.93 |
| 2026-08-16 00:00 |
18:06:49.07 |
-46:53:22.8 |
HIP 88782 |
6.37 |
| 2026-08-16 12:00 |
18:06:46.61 |
-46:53:09.6 |
HIP 88782 |
6.81 |
| 2026-08-17 00:00 |
18:06:44.19 |
-46:52:56.4 |
HIP 88782 |
7.25 |
| 2026-08-17 12:00 |
18:06:41.80 |
-46:52:43.0 |
HIP 88782 |
7.69 |
| 2026-08-18 00:00 |
18:06:39.44 |
-46:52:29.5 |
HIP 88782 |
8.12 |
| 2026-08-18 12:00 |
18:06:37.11 |
-46:52:15.9 |
HIP 88782 |
8.55 |
| 2026-08-19 00:00 |
18:06:34.82 |
-46:52:02.3 |
HIP 88782 |
8.98 |