| Parameter |
Value |
| Designation |
C/2004 F2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2003-12-26T15:29:44.825280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:38Z |
| Obs used |
144 |
| NEO |
- |
| M1 |
16.300 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2004-05-04.0000000 |
| e |
0.99055864 |
| q (au) |
1.430438 |
| a (au) |
151.507608 |
| i (deg) |
104.959961 |
| Ω (om, deg) |
248.273455 |
| ω (w, deg) |
317.143157 |
| M (ma, deg) |
0.068365 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.356 + 3.043\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.356 |
| n |
3.043 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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 |
07:22:49.29 |
+80:56:15.9 |
HIP 35874 |
18.83 |
| 2026-07-29 12:00 |
07:23:05.20 |
+80:56:22.3 |
HIP 35874 |
18.87 |
| 2026-07-30 00:00 |
07:23:21.07 |
+80:56:29.0 |
HIP 35874 |
18.94 |
| 2026-07-30 12:00 |
07:23:36.90 |
+80:56:35.9 |
HIP 35874 |
19.03 |
| 2026-07-31 00:00 |
07:23:52.70 |
+80:56:43.1 |
HIP 36019 |
19.05 |
| 2026-07-31 12:00 |
07:24:08.45 |
+80:56:50.5 |
HIP 36019 |
18.83 |
| 2026-08-01 00:00 |
07:24:24.18 |
+80:56:58.2 |
HIP 36019 |
18.62 |
| 2026-08-01 12:00 |
07:24:39.86 |
+80:57:06.1 |
HIP 36019 |
18.42 |
| 2026-08-02 00:00 |
07:24:55.50 |
+80:57:14.3 |
HIP 36019 |
18.24 |
| 2026-08-02 12:00 |
07:25:11.11 |
+80:57:22.7 |
HIP 36019 |
18.08 |
| 2026-08-03 00:00 |
07:25:26.67 |
+80:57:31.4 |
HIP 36019 |
17.93 |
| 2026-08-03 12:00 |
07:25:42.19 |
+80:57:40.3 |
HIP 36019 |
17.80 |
| 2026-08-04 00:00 |
07:25:57.67 |
+80:57:49.4 |
HIP 36019 |
17.68 |
| 2026-08-04 12:00 |
07:26:13.10 |
+80:57:58.8 |
HIP 36019 |
17.58 |
| 2026-08-05 00:00 |
07:26:28.49 |
+80:58:08.5 |
HIP 36019 |
17.50 |
| 2026-08-05 12:00 |
07:26:43.84 |
+80:58:18.4 |
HIP 36019 |
17.43 |
| 2026-08-06 00:00 |
07:26:59.14 |
+80:58:28.5 |
HIP 36019 |
17.39 |
| 2026-08-06 12:00 |
07:27:14.39 |
+80:58:38.9 |
HIP 36019 |
17.35 |
| 2026-08-07 00:00 |
07:27:29.60 |
+80:58:49.5 |
HIP 36019 |
17.34 |
| 2026-08-07 12:00 |
07:27:44.76 |
+80:59:00.4 |
HIP 36858 |
17.15 |
| 2026-08-08 00:00 |
07:27:59.87 |
+80:59:11.6 |
HIP 36858 |
16.64 |
| 2026-08-08 12:00 |
07:28:14.93 |
+80:59:22.9 |
HIP 36858 |
16.14 |
| 2026-08-09 00:00 |
07:28:29.94 |
+80:59:34.5 |
HIP 36858 |
15.66 |
| 2026-08-09 12:00 |
07:28:44.90 |
+80:59:46.4 |
HIP 36858 |
15.19 |
| 2026-08-10 00:00 |
07:28:59.80 |
+80:59:58.5 |
HIP 36858 |
14.73 |
| 2026-08-10 12:00 |
07:29:14.66 |
+81:00:10.9 |
HIP 36858 |
14.29 |
| 2026-08-11 00:00 |
07:29:29.45 |
+81:00:23.5 |
HIP 36858 |
13.87 |
| 2026-08-11 12:00 |
07:29:44.20 |
+81:00:36.3 |
HIP 36858 |
13.47 |
| 2026-08-12 00:00 |
07:29:58.89 |
+81:00:49.4 |
HIP 36858 |
13.08 |
| 2026-08-12 12:00 |
07:30:13.52 |
+81:01:02.7 |
HIP 36858 |
12.73 |
| 2026-08-13 00:00 |
07:30:28.09 |
+81:01:16.3 |
HIP 36858 |
12.39 |
| 2026-08-13 12:00 |
07:30:42.60 |
+81:01:30.1 |
HIP 36858 |
12.09 |
| 2026-08-14 00:00 |
07:30:57.06 |
+81:01:44.2 |
HIP 36858 |
11.81 |
| 2026-08-14 12:00 |
07:31:11.45 |
+81:01:58.5 |
HIP 36858 |
11.56 |
| 2026-08-15 00:00 |
07:31:25.78 |
+81:02:13.1 |
HIP 36858 |
11.35 |
| 2026-08-15 12:00 |
07:31:40.05 |
+81:02:27.8 |
HIP 36858 |
11.17 |
| 2026-08-16 00:00 |
07:31:54.26 |
+81:02:42.9 |
HIP 36858 |
11.03 |
| 2026-08-16 12:00 |
07:32:08.40 |
+81:02:58.1 |
HIP 36858 |
10.92 |
| 2026-08-17 00:00 |
07:32:22.48 |
+81:03:13.6 |
HIP 36858 |
10.86 |
| 2026-08-17 12:00 |
07:32:36.49 |
+81:03:29.4 |
HIP 36858 |
10.83 |
| 2026-08-18 00:00 |
07:32:50.44 |
+81:03:45.3 |
HIP 36858 |
10.84 |
| 2026-08-18 12:00 |
07:33:04.32 |
+81:04:01.5 |
HIP 36858 |
10.89 |
| 2026-08-19 00:00 |
07:33:18.13 |
+81:04:18.0 |
HIP 36858 |
10.98 |