C/2003 WT42 (LINEAR)
| 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 |
2005-01-20 |
+7.2060 |
-6.433 |
| 2005-01-20 |
2006-04-02 |
-11.0858 |
+8.249 |
| 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) |
| 2026-02-03 00:00 |
18:17:08.22 |
-45:50:51.4 |
HIP 89585 |
13.89 |
| 2026-02-03 12:00 |
18:17:12.13 |
-45:51:03.6 |
HIP 89585 |
13.84 |
| 2026-02-04 00:00 |
18:17:16.01 |
-45:51:15.9 |
HIP 89585 |
13.84 |
| 2026-02-04 12:00 |
18:17:19.86 |
-45:51:28.4 |
HIP 89585 |
13.86 |
| 2026-02-05 00:00 |
18:17:23.69 |
-45:51:41.0 |
HIP 89585 |
13.91 |
| 2026-02-05 12:00 |
18:17:27.50 |
-45:51:53.7 |
HIP 89585 |
14.00 |
| 2026-02-06 00:00 |
18:17:31.28 |
-45:52:06.5 |
HIP 89585 |
14.11 |
| 2026-02-06 12:00 |
18:17:35.04 |
-45:52:19.5 |
HIP 89585 |
14.26 |
| 2026-02-07 00:00 |
18:17:38.76 |
-45:52:32.6 |
HIP 89585 |
14.43 |
| 2026-02-07 12:00 |
18:17:42.47 |
-45:52:45.8 |
HIP 89585 |
14.62 |
| 2026-02-08 00:00 |
18:17:46.14 |
-45:52:59.1 |
HIP 89585 |
14.84 |
| 2026-02-08 12:00 |
18:17:49.79 |
-45:53:12.5 |
HIP 89585 |
15.09 |
| 2026-02-09 00:00 |
18:17:53.41 |
-45:53:26.1 |
HIP 89585 |
15.35 |
| 2026-02-09 12:00 |
18:17:57.00 |
-45:53:39.7 |
HIP 89585 |
15.63 |
| 2026-02-10 00:00 |
18:18:00.57 |
-45:53:53.5 |
HIP 89585 |
15.93 |
| 2026-02-10 12:00 |
18:18:04.11 |
-45:54:07.4 |
HIP 89585 |
16.25 |
| 2026-02-11 00:00 |
18:18:07.62 |
-45:54:21.4 |
HIP 89585 |
16.58 |
| 2026-02-11 12:00 |
18:18:11.10 |
-45:54:35.5 |
HIP 89585 |
16.93 |
| 2026-02-12 00:00 |
18:18:14.55 |
-45:54:49.8 |
HIP 89585 |
17.28 |
| 2026-02-12 12:00 |
18:18:17.97 |
-45:55:04.1 |
HIP 89585 |
17.65 |
| 2026-02-13 00:00 |
18:18:21.37 |
-45:55:18.6 |
HIP 89585 |
18.03 |
| 2026-02-13 12:00 |
18:18:24.73 |
-45:55:33.2 |
HIP 89585 |
18.42 |
| 2026-02-14 00:00 |
18:18:28.07 |
-45:55:47.9 |
HIP 89855 |
17.98 |
| 2026-02-14 12:00 |
18:18:31.37 |
-45:56:02.7 |
HIP 89855 |
17.42 |
| 2026-02-15 00:00 |
18:18:34.65 |
-45:56:17.6 |
HIP 89855 |
16.86 |
| 2026-02-15 12:00 |
18:18:37.90 |
-45:56:32.6 |
HIP 89855 |
16.31 |
| 2026-02-16 00:00 |
18:18:41.11 |
-45:56:47.7 |
HIP 89855 |
15.78 |
| 2026-02-16 12:00 |
18:18:44.29 |
-45:57:02.9 |
HIP 89855 |
15.25 |
| 2026-02-17 00:00 |
18:18:47.45 |
-45:57:18.3 |
HIP 89855 |
14.74 |
| 2026-02-17 12:00 |
18:18:50.57 |
-45:57:33.7 |
HIP 89855 |
14.24 |
| 2026-02-18 00:00 |
18:18:53.66 |
-45:57:49.2 |
HIP 89855 |
13.75 |
| 2026-02-18 12:00 |
18:18:56.72 |
-45:58:04.9 |
HIP 89855 |
13.28 |
| 2026-02-19 00:00 |
18:18:59.74 |
-45:58:20.6 |
HIP 89855 |
12.83 |
| 2026-02-19 12:00 |
18:19:02.74 |
-45:58:36.5 |
HIP 89855 |
12.39 |
| 2026-02-20 00:00 |
18:19:05.70 |
-45:58:52.4 |
HIP 89855 |
11.97 |
| 2026-02-20 12:00 |
18:19:08.63 |
-45:59:08.5 |
HIP 89855 |
11.57 |
| 2026-02-21 00:00 |
18:19:11.52 |
-45:59:24.6 |
HIP 89855 |
11.19 |
| 2026-02-21 12:00 |
18:19:14.39 |
-45:59:40.9 |
HIP 89855 |
10.84 |
| 2026-02-22 00:00 |
18:19:17.22 |
-45:59:57.2 |
HIP 89855 |
10.50 |
| 2026-02-22 12:00 |
18:19:20.01 |
-46:00:13.6 |
HIP 89855 |
10.20 |
| 2026-02-23 00:00 |
18:19:22.78 |
-46:00:30.2 |
HIP 89855 |
9.92 |
| 2026-02-23 12:00 |
18:19:25.51 |
-46:00:46.8 |
HIP 89855 |
9.68 |
| 2026-02-24 00:00 |
18:19:28.20 |
-46:01:03.5 |
HIP 89855 |
9.46 |