| Parameter |
Value |
| Designation |
C/2003 S3 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2003-04-10T12:54:00.440640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:31Z |
| Obs used |
122 |
| NEO |
- |
| M1 |
6.700 |
| K1 |
9.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2003-10-21.0000000 |
| e |
1.00180553 |
| q (au) |
8.129525 |
| a (au) |
-4502.566031 |
| i (deg) |
151.497754 |
| Ω (om, deg) |
226.388802 |
| ω (w, deg) |
154.570171 |
| M (ma, deg) |
0.000631 |
Magnitude
Scatter + Global Linear
$$
M_a = (0.591 + 5.968\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
0.591 |
| n |
5.968 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
21:06:20.55 |
-46:42:52.2 |
HIP 104326 |
21.79 |
| 2026-07-29 12:00 |
21:06:15.91 |
-46:43:07.6 |
HIP 104326 |
22.58 |
| 2026-07-30 00:00 |
21:06:11.27 |
-46:43:22.8 |
HIP 104326 |
23.37 |
| 2026-07-30 12:00 |
21:06:06.62 |
-46:43:37.8 |
HIP 104326 |
24.16 |
| 2026-07-31 00:00 |
21:06:01.97 |
-46:43:52.7 |
HIP 104326 |
24.95 |
| 2026-07-31 12:00 |
21:05:57.31 |
-46:44:07.3 |
HIP 104326 |
25.75 |
| 2026-08-01 00:00 |
21:05:52.65 |
-46:44:21.7 |
HIP 104326 |
26.55 |
| 2026-08-01 12:00 |
21:05:47.99 |
-46:44:35.9 |
HIP 104326 |
27.34 |
| 2026-08-02 00:00 |
21:05:43.32 |
-46:44:50.0 |
HIP 104326 |
28.14 |
| 2026-08-02 12:00 |
21:05:38.65 |
-46:45:03.8 |
HIP 104326 |
28.94 |
| 2026-08-03 00:00 |
21:05:33.98 |
-46:45:17.5 |
HIP 104326 |
29.74 |
| 2026-08-03 12:00 |
21:05:29.31 |
-46:45:30.9 |
HIP 103977 |
29.58 |
| 2026-08-04 00:00 |
21:05:24.63 |
-46:45:44.2 |
HIP 103977 |
29.38 |
| 2026-08-04 12:00 |
21:05:19.95 |
-46:45:57.2 |
HIP 103977 |
29.20 |
| 2026-08-05 00:00 |
21:05:15.27 |
-46:46:10.0 |
HIP 103977 |
29.03 |
| 2026-08-05 12:00 |
21:05:10.59 |
-46:46:22.7 |
HIP 103977 |
28.89 |
| 2026-08-06 00:00 |
21:05:05.90 |
-46:46:35.1 |
HIP 103977 |
28.76 |
| 2026-08-06 12:00 |
21:05:01.22 |
-46:46:47.3 |
HIP 103977 |
28.66 |
| 2026-08-07 00:00 |
21:04:56.54 |
-46:46:59.4 |
HIP 103977 |
28.58 |
| 2026-08-07 12:00 |
21:04:51.86 |
-46:47:11.2 |
HIP 103977 |
28.51 |
| 2026-08-08 00:00 |
21:04:47.17 |
-46:47:22.8 |
HIP 103977 |
28.47 |
| 2026-08-08 12:00 |
21:04:42.49 |
-46:47:34.2 |
HIP 103977 |
28.45 |
| 2026-08-09 00:00 |
21:04:37.81 |
-46:47:45.4 |
HIP 103977 |
28.45 |
| 2026-08-09 12:00 |
21:04:33.13 |
-46:47:56.4 |
HIP 103977 |
28.47 |
| 2026-08-10 00:00 |
21:04:28.46 |
-46:48:07.1 |
HIP 103977 |
28.51 |
| 2026-08-10 12:00 |
21:04:23.78 |
-46:48:17.7 |
HIP 103977 |
28.57 |
| 2026-08-11 00:00 |
21:04:19.11 |
-46:48:28.0 |
HIP 103977 |
28.65 |
| 2026-08-11 12:00 |
21:04:14.44 |
-46:48:38.1 |
HIP 103977 |
28.75 |
| 2026-08-12 00:00 |
21:04:09.78 |
-46:48:48.0 |
HIP 103977 |
28.87 |
| 2026-08-12 12:00 |
21:04:05.12 |
-46:48:57.7 |
HIP 103977 |
29.01 |
| 2026-08-13 00:00 |
21:04:00.46 |
-46:49:07.2 |
HIP 103977 |
29.17 |
| 2026-08-13 12:00 |
21:03:55.81 |
-46:49:16.5 |
HIP 103977 |
29.34 |
| 2026-08-14 00:00 |
21:03:51.16 |
-46:49:25.5 |
HIP 103977 |
29.54 |
| 2026-08-14 12:00 |
21:03:46.51 |
-46:49:34.3 |
HIP 103977 |
29.75 |
| 2026-08-15 00:00 |
21:03:41.88 |
-46:49:42.9 |
HIP 103977 |
29.97 |
| 2026-08-15 12:00 |
21:03:37.25 |
-46:49:51.3 |
HIP 103977 |
30.22 |
| 2026-08-16 00:00 |
21:03:32.62 |
-46:49:59.5 |
HIP 103977 |
30.48 |
| 2026-08-16 12:00 |
21:03:28.00 |
-46:50:07.4 |
HIP 103977 |
30.75 |
| 2026-08-17 00:00 |
21:03:23.39 |
-46:50:15.1 |
HIP 103977 |
31.04 |
| 2026-08-17 12:00 |
21:03:18.79 |
-46:50:22.6 |
HIP 103676 |
31.17 |
| 2026-08-18 00:00 |
21:03:14.19 |
-46:50:29.9 |
HIP 103676 |
30.40 |
| 2026-08-18 12:00 |
21:03:09.61 |
-46:50:37.0 |
HIP 103676 |
29.62 |
| 2026-08-19 00:00 |
21:03:05.03 |
-46:50:43.8 |
HIP 103676 |
28.85 |