C/2003 T4 (LINEAR)
| Parameter |
Value |
| Designation |
C/2003 T4 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-04-03T15:45:28.166400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:34Z |
| Obs used |
955 |
| NEO |
- |
| M1 |
9.200 |
| K1 |
6.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2004-10-20.0000000 |
| e |
1.00047448 |
| q (au) |
0.849741 |
| a (au) |
-1790.885861 |
| i (deg) |
86.761193 |
| Ω (om, deg) |
93.902875 |
| ω (w, deg) |
181.679273 |
| M (ma, deg) |
-0.002154 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.953 + 4.136\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.953 |
| n |
4.136 |
| gf |
0.800 |
| gb |
-1.000 |
| k |
0.988 |
| δ90 |
1.000 |
| 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 |
| 2003-10-13 |
2004-05-22 |
+1.4145 |
-1.791 |
| 2004-05-22 |
2004-09-06 |
+1.1723 |
-1.351 |
| 2004-09-06 |
2005-04-02 |
-1.5294 |
-0.289 |
| 2005-04-03 |
2005-05-04 |
+13.8649 |
+1.663 |
| 2005-05-04 |
2006-03-25 |
+0.8135 |
+1.141 |
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 |
06:08:22.02 |
+08:21:57.9 |
HIP 29063 |
11.43 |
| 2026-02-03 12:00 |
06:08:19.84 |
+08:22:07.3 |
HIP 29063 |
11.22 |
| 2026-02-04 00:00 |
06:08:17.68 |
+08:22:16.7 |
HIP 29063 |
11.03 |
| 2026-02-04 12:00 |
06:08:15.53 |
+08:22:26.2 |
HIP 29063 |
10.87 |
| 2026-02-05 00:00 |
06:08:13.40 |
+08:22:35.8 |
HIP 29063 |
10.74 |
| 2026-02-05 12:00 |
06:08:11.29 |
+08:22:45.5 |
HIP 29063 |
10.64 |
| 2026-02-06 00:00 |
06:08:09.20 |
+08:22:55.2 |
HIP 29063 |
10.57 |
| 2026-02-06 12:00 |
06:08:07.13 |
+08:23:04.9 |
HIP 29063 |
10.53 |
| 2026-02-07 00:00 |
06:08:05.07 |
+08:23:14.7 |
HIP 29063 |
10.52 |
| 2026-02-07 12:00 |
06:08:03.04 |
+08:23:24.6 |
HIP 29063 |
10.54 |
| 2026-02-08 00:00 |
06:08:01.02 |
+08:23:34.6 |
HIP 29063 |
10.58 |
| 2026-02-08 12:00 |
06:07:59.03 |
+08:23:44.6 |
HIP 29063 |
10.66 |
| 2026-02-09 00:00 |
06:07:57.05 |
+08:23:54.6 |
HIP 29027 |
10.63 |
| 2026-02-09 12:00 |
06:07:55.09 |
+08:24:04.8 |
HIP 29027 |
10.42 |
| 2026-02-10 00:00 |
06:07:53.16 |
+08:24:14.9 |
HIP 29027 |
10.25 |
| 2026-02-10 12:00 |
06:07:51.24 |
+08:24:25.2 |
HIP 29027 |
10.10 |
| 2026-02-11 00:00 |
06:07:49.34 |
+08:24:35.5 |
HIP 29027 |
9.97 |
| 2026-02-11 12:00 |
06:07:47.47 |
+08:24:45.8 |
HIP 29027 |
9.87 |
| 2026-02-12 00:00 |
06:07:45.61 |
+08:24:56.2 |
HIP 29027 |
9.81 |
| 2026-02-12 12:00 |
06:07:43.78 |
+08:25:06.7 |
HIP 29027 |
9.76 |
| 2026-02-13 00:00 |
06:07:41.96 |
+08:25:17.2 |
HIP 29027 |
9.75 |
| 2026-02-13 12:00 |
06:07:40.17 |
+08:25:27.7 |
HIP 29027 |
9.76 |
| 2026-02-14 00:00 |
06:07:38.39 |
+08:25:38.3 |
HIP 29027 |
9.79 |
| 2026-02-14 12:00 |
06:07:36.64 |
+08:25:49.0 |
HIP 29027 |
9.85 |
| 2026-02-15 00:00 |
06:07:34.91 |
+08:25:59.7 |
HIP 29027 |
9.94 |
| 2026-02-15 12:00 |
06:07:33.20 |
+08:26:10.5 |
HIP 29027 |
10.05 |
| 2026-02-16 00:00 |
06:07:31.52 |
+08:26:21.3 |
HIP 29027 |
10.17 |
| 2026-02-16 12:00 |
06:07:29.85 |
+08:26:32.1 |
HIP 29027 |
10.32 |
| 2026-02-17 00:00 |
06:07:28.21 |
+08:26:43.0 |
HIP 29027 |
10.49 |
| 2026-02-17 12:00 |
06:07:26.58 |
+08:26:54.0 |
HIP 29027 |
10.67 |
| 2026-02-18 00:00 |
06:07:24.99 |
+08:27:05.0 |
HIP 29027 |
10.86 |
| 2026-02-18 12:00 |
06:07:23.41 |
+08:27:16.0 |
HIP 29027 |
11.08 |
| 2026-02-19 00:00 |
06:07:21.85 |
+08:27:27.1 |
HIP 29027 |
11.30 |
| 2026-02-19 12:00 |
06:07:20.32 |
+08:27:38.2 |
HIP 29027 |
11.53 |
| 2026-02-20 00:00 |
06:07:18.81 |
+08:27:49.4 |
HIP 29027 |
11.78 |
| 2026-02-20 12:00 |
06:07:17.32 |
+08:28:00.6 |
HIP 29027 |
12.03 |
| 2026-02-21 00:00 |
06:07:15.86 |
+08:28:11.8 |
HIP 29027 |
12.30 |
| 2026-02-21 12:00 |
06:07:14.41 |
+08:28:23.1 |
HIP 29027 |
12.56 |
| 2026-02-22 00:00 |
06:07:12.99 |
+08:28:34.4 |
HIP 29027 |
12.84 |
| 2026-02-22 12:00 |
06:07:11.60 |
+08:28:45.8 |
HIP 29027 |
13.12 |
| 2026-02-23 00:00 |
06:07:10.22 |
+08:28:57.1 |
HIP 29027 |
13.41 |
| 2026-02-23 12:00 |
06:07:08.87 |
+08:29:08.6 |
HIP 29027 |
13.69 |
| 2026-02-24 00:00 |
06:07:07.55 |
+08:29:20.0 |
HIP 29027 |
13.99 |