| Parameter |
Value |
| Designation |
C/2003 F1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2003-06-28T11:02:31.318080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:27Z |
| Obs used |
1150 |
| NEO |
- |
| M1 |
8.300 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2003-05-31.0000000 |
| e |
0.80603402 |
| q (au) |
4.007799 |
| a (au) |
20.662380 |
| i (deg) |
70.221513 |
| Ω (om, deg) |
87.487652 |
| ω (w, deg) |
121.188132 |
| M (ma, deg) |
359.701345 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.239 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.239 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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 |
04:03:15.33 |
-48:56:19.0 |
HIP 18874 |
8.23 |
| 2026-07-29 12:00 |
04:03:18.11 |
-48:57:00.9 |
HIP 18874 |
9.06 |
| 2026-07-30 00:00 |
04:03:20.85 |
-48:57:43.0 |
HIP 18874 |
9.89 |
| 2026-07-30 12:00 |
04:03:23.55 |
-48:58:25.4 |
HIP 18874 |
10.72 |
| 2026-07-31 00:00 |
04:03:26.21 |
-48:59:08.0 |
HIP 18874 |
11.56 |
| 2026-07-31 12:00 |
04:03:28.83 |
-48:59:50.8 |
HIP 18874 |
12.39 |
| 2026-08-01 00:00 |
04:03:31.41 |
-49:00:33.9 |
HIP 18874 |
13.22 |
| 2026-08-01 12:00 |
04:03:33.94 |
-49:01:17.2 |
HIP 18874 |
14.04 |
| 2026-08-02 00:00 |
04:03:36.43 |
-49:02:00.6 |
HIP 18874 |
14.87 |
| 2026-08-02 12:00 |
04:03:38.88 |
-49:02:44.4 |
HIP 18874 |
15.70 |
| 2026-08-03 00:00 |
04:03:41.28 |
-49:03:28.3 |
HIP 18874 |
16.53 |
| 2026-08-03 12:00 |
04:03:43.64 |
-49:04:12.4 |
HIP 18874 |
17.35 |
| 2026-08-04 00:00 |
04:03:45.96 |
-49:04:56.8 |
HIP 18874 |
18.18 |
| 2026-08-04 12:00 |
04:03:48.23 |
-49:05:41.3 |
HIP 18874 |
19.00 |
| 2026-08-05 00:00 |
04:03:50.46 |
-49:06:26.1 |
HIP 18874 |
19.83 |
| 2026-08-05 12:00 |
04:03:52.65 |
-49:07:11.0 |
HIP 18874 |
20.65 |
| 2026-08-06 00:00 |
04:03:54.79 |
-49:07:56.2 |
HIP 18874 |
21.47 |
| 2026-08-06 12:00 |
04:03:56.89 |
-49:08:41.5 |
HIP 18874 |
22.30 |
| 2026-08-07 00:00 |
04:03:58.94 |
-49:09:27.1 |
HIP 18874 |
23.12 |
| 2026-08-07 12:00 |
04:04:00.95 |
-49:10:12.8 |
HIP 18874 |
23.94 |
| 2026-08-08 00:00 |
04:04:02.91 |
-49:10:58.7 |
HIP 18874 |
24.76 |
| 2026-08-08 12:00 |
04:04:04.83 |
-49:11:44.8 |
HIP 18874 |
25.58 |
| 2026-08-09 00:00 |
04:04:06.70 |
-49:12:31.1 |
HIP 18874 |
26.40 |
| 2026-08-09 12:00 |
04:04:08.52 |
-49:13:17.5 |
HIP 18874 |
27.22 |
| 2026-08-10 00:00 |
04:04:10.30 |
-49:14:04.1 |
HIP 19142 |
27.98 |
| 2026-08-10 12:00 |
04:04:12.04 |
-49:14:50.9 |
HIP 19142 |
28.34 |
| 2026-08-11 00:00 |
04:04:13.72 |
-49:15:37.8 |
HIP 19142 |
28.73 |
| 2026-08-11 12:00 |
04:04:15.36 |
-49:16:24.9 |
HIP 19142 |
29.14 |
| 2026-08-12 00:00 |
04:04:16.96 |
-49:17:12.2 |
HIP 19142 |
29.58 |
| 2026-08-12 12:00 |
04:04:18.50 |
-49:17:59.6 |
HIP 19142 |
30.04 |
| 2026-08-13 00:00 |
04:04:20.00 |
-49:18:47.2 |
HIP 19142 |
30.52 |
| 2026-08-13 12:00 |
04:04:21.46 |
-49:19:34.9 |
HIP 19196 |
30.34 |
| 2026-08-14 00:00 |
04:04:22.86 |
-49:20:22.7 |
HIP 19196 |
29.68 |
| 2026-08-14 12:00 |
04:04:24.22 |
-49:21:10.7 |
HIP 19196 |
29.03 |
| 2026-08-15 00:00 |
04:04:25.53 |
-49:21:58.8 |
HIP 19196 |
28.40 |
| 2026-08-15 12:00 |
04:04:26.79 |
-49:22:47.0 |
HIP 19196 |
27.79 |
| 2026-08-16 00:00 |
04:04:28.00 |
-49:23:35.4 |
HIP 19196 |
27.20 |
| 2026-08-16 12:00 |
04:04:29.17 |
-49:24:23.8 |
HIP 19196 |
26.62 |
| 2026-08-17 00:00 |
04:04:30.29 |
-49:25:12.4 |
HIP 19196 |
26.06 |
| 2026-08-17 12:00 |
04:04:31.36 |
-49:26:01.1 |
HIP 19196 |
25.52 |
| 2026-08-18 00:00 |
04:04:32.38 |
-49:26:49.9 |
HIP 19196 |
25.01 |
| 2026-08-18 12:00 |
04:04:33.35 |
-49:27:38.9 |
HIP 19196 |
24.52 |
| 2026-08-19 00:00 |
04:04:34.28 |
-49:28:27.9 |
HIP 19196 |
24.05 |