| 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) |
| 2026-06-01 00:00 |
18:16:32.72 |
-46:58:35.3 |
HIP 89578 |
4.34 |
| 2026-06-01 12:00 |
18:16:28.79 |
-46:58:45.7 |
HIP 89578 |
4.56 |
| 2026-06-02 00:00 |
18:16:24.84 |
-46:58:55.8 |
HIP 89578 |
4.88 |
| 2026-06-02 12:00 |
18:16:20.88 |
-46:59:05.8 |
HIP 89578 |
5.27 |
| 2026-06-03 00:00 |
18:16:16.90 |
-46:59:15.7 |
HIP 89578 |
5.73 |
| 2026-06-03 12:00 |
18:16:12.90 |
-46:59:25.4 |
HIP 89578 |
6.23 |
| 2026-06-04 00:00 |
18:16:08.89 |
-46:59:35.0 |
HIP 89578 |
6.78 |
| 2026-06-04 12:00 |
18:16:04.87 |
-46:59:44.4 |
HIP 89578 |
7.35 |
| 2026-06-05 00:00 |
18:16:00.83 |
-46:59:53.6 |
HIP 89578 |
7.95 |
| 2026-06-05 12:00 |
18:15:56.78 |
-47:00:02.7 |
HIP 89578 |
8.56 |
| 2026-06-06 00:00 |
18:15:52.71 |
-47:00:11.6 |
HIP 89578 |
9.20 |
| 2026-06-06 12:00 |
18:15:48.63 |
-47:00:20.4 |
HIP 89578 |
9.84 |
| 2026-06-07 00:00 |
18:15:44.53 |
-47:00:29.0 |
HIP 89578 |
10.50 |
| 2026-06-07 12:00 |
18:15:40.43 |
-47:00:37.4 |
HIP 89578 |
11.16 |
| 2026-06-08 00:00 |
18:15:36.31 |
-47:00:45.7 |
HIP 89578 |
11.84 |
| 2026-06-08 12:00 |
18:15:32.18 |
-47:00:53.8 |
HIP 89578 |
12.52 |
| 2026-06-09 00:00 |
18:15:28.04 |
-47:01:01.7 |
HIP 89578 |
13.20 |
| 2026-06-09 12:00 |
18:15:23.88 |
-47:01:09.5 |
HIP 89578 |
13.90 |
| 2026-06-10 00:00 |
18:15:19.72 |
-47:01:17.1 |
HIP 89578 |
14.59 |
| 2026-06-10 12:00 |
18:15:15.54 |
-47:01:24.6 |
HIP 89578 |
15.29 |
| 2026-06-11 00:00 |
18:15:11.35 |
-47:01:31.9 |
HIP 89578 |
16.00 |
| 2026-06-11 12:00 |
18:15:07.16 |
-47:01:39.0 |
HIP 89578 |
16.71 |
| 2026-06-12 00:00 |
18:15:02.95 |
-47:01:46.0 |
HIP 89578 |
17.42 |
| 2026-06-12 12:00 |
18:14:58.73 |
-47:01:52.7 |
HIP 89578 |
18.13 |
| 2026-06-13 00:00 |
18:14:54.51 |
-47:01:59.4 |
HIP 89578 |
18.85 |
| 2026-06-13 12:00 |
18:14:50.28 |
-47:02:05.8 |
HIP 89578 |
19.57 |
| 2026-06-14 00:00 |
18:14:46.04 |
-47:02:12.1 |
HIP 89578 |
20.29 |
| 2026-06-14 12:00 |
18:14:41.79 |
-47:02:18.2 |
HIP 89578 |
21.01 |
| 2026-06-15 00:00 |
18:14:37.53 |
-47:02:24.2 |
HIP 89578 |
21.74 |
| 2026-06-15 12:00 |
18:14:33.27 |
-47:02:29.9 |
HIP 89578 |
22.46 |
| 2026-06-16 00:00 |
18:14:29.00 |
-47:02:35.5 |
HIP 89578 |
23.19 |
| 2026-06-16 12:00 |
18:14:24.72 |
-47:02:41.0 |
HIP 89578 |
23.92 |
| 2026-06-17 00:00 |
18:14:20.44 |
-47:02:46.2 |
HIP 89578 |
24.65 |
| 2026-06-17 12:00 |
18:14:16.15 |
-47:02:51.3 |
HIP 89578 |
25.38 |
| 2026-06-18 00:00 |
18:14:11.86 |
-47:02:56.2 |
HIP 89578 |
26.11 |
| 2026-06-18 12:00 |
18:14:07.56 |
-47:03:01.0 |
HIP 89578 |
26.85 |
| 2026-06-19 00:00 |
18:14:03.26 |
-47:03:05.5 |
HIP 89578 |
27.58 |
| 2026-06-19 12:00 |
18:13:58.96 |
-47:03:09.9 |
HIP 89578 |
28.32 |
| 2026-06-20 00:00 |
18:13:54.65 |
-47:03:14.1 |
HIP 89578 |
29.05 |
| 2026-06-20 12:00 |
18:13:50.34 |
-47:03:18.2 |
HIP 89578 |
29.79 |
| 2026-06-21 00:00 |
18:13:46.03 |
-47:03:22.1 |
HIP 89578 |
30.52 |
| 2026-06-21 12:00 |
18:13:41.71 |
-47:03:25.8 |
HIP 89232 |
30.87 |
| 2026-06-22 00:00 |
18:13:37.39 |
-47:03:29.3 |
HIP 89064 |
30.63 |