| 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) |
| 2026-05-12 00:00 |
06:42:34.47 |
+81:28:38.1 |
HIP 31529 |
17.10 |
| 2026-05-12 12:00 |
06:42:46.22 |
+81:28:08.9 |
HIP 31529 |
17.24 |
| 2026-05-13 00:00 |
06:42:58.07 |
+81:27:39.9 |
HIP 31529 |
17.41 |
| 2026-05-13 12:00 |
06:43:10.01 |
+81:27:11.1 |
HIP 31529 |
17.60 |
| 2026-05-14 00:00 |
06:43:22.04 |
+81:26:42.4 |
HIP 31529 |
17.83 |
| 2026-05-14 12:00 |
06:43:34.17 |
+81:26:13.9 |
HIP 31529 |
18.08 |
| 2026-05-15 00:00 |
06:43:46.39 |
+81:25:45.6 |
HIP 31529 |
18.35 |
| 2026-05-15 12:00 |
06:43:58.69 |
+81:25:17.5 |
HIP 31529 |
18.65 |
| 2026-05-16 00:00 |
06:44:11.09 |
+81:24:49.5 |
HIP 31529 |
18.97 |
| 2026-05-16 12:00 |
06:44:23.57 |
+81:24:21.8 |
HIP 31529 |
19.32 |
| 2026-05-17 00:00 |
06:44:36.14 |
+81:23:54.2 |
HIP 31529 |
19.68 |
| 2026-05-17 12:00 |
06:44:48.79 |
+81:23:26.8 |
HIP 31529 |
20.07 |
| 2026-05-18 00:00 |
06:45:01.53 |
+81:22:59.6 |
HIP 31529 |
20.47 |
| 2026-05-18 12:00 |
06:45:14.35 |
+81:22:32.6 |
HIP 31529 |
20.89 |
| 2026-05-19 00:00 |
06:45:27.26 |
+81:22:05.8 |
HIP 31529 |
21.32 |
| 2026-05-19 12:00 |
06:45:40.25 |
+81:21:39.2 |
HIP 31529 |
21.78 |
| 2026-05-20 00:00 |
06:45:53.31 |
+81:21:12.7 |
HIP 31529 |
22.24 |
| 2026-05-20 12:00 |
06:46:06.46 |
+81:20:46.5 |
HIP 31529 |
22.72 |
| 2026-05-21 00:00 |
06:46:19.68 |
+81:20:20.4 |
HIP 31529 |
23.21 |
| 2026-05-21 12:00 |
06:46:32.98 |
+81:19:54.5 |
HIP 31529 |
23.72 |
| 2026-05-22 00:00 |
06:46:46.36 |
+81:19:28.9 |
HIP 31529 |
24.23 |
| 2026-05-22 12:00 |
06:46:59.82 |
+81:19:03.4 |
HIP 31529 |
24.76 |
| 2026-05-23 00:00 |
06:47:13.34 |
+81:18:38.1 |
HIP 31529 |
25.29 |
| 2026-05-23 12:00 |
06:47:26.94 |
+81:18:13.1 |
HIP 31529 |
25.83 |
| 2026-05-24 00:00 |
06:47:40.61 |
+81:17:48.2 |
HIP 31529 |
26.39 |
| 2026-05-24 12:00 |
06:47:54.36 |
+81:17:23.5 |
HIP 31529 |
26.95 |
| 2026-05-25 00:00 |
06:48:08.17 |
+81:16:59.0 |
HIP 31529 |
27.52 |
| 2026-05-25 12:00 |
06:48:22.05 |
+81:16:34.8 |
HIP 31529 |
28.09 |
| 2026-05-26 00:00 |
06:48:36.00 |
+81:16:10.7 |
HIP 31529 |
28.67 |
| 2026-05-26 12:00 |
06:48:50.02 |
+81:15:46.8 |
HIP 31529 |
29.26 |
| 2026-05-27 00:00 |
06:49:04.10 |
+81:15:23.2 |
HIP 33548 |
29.10 |
| 2026-05-27 12:00 |
06:49:18.25 |
+81:14:59.7 |
HIP 33548 |
28.44 |
| 2026-05-28 00:00 |
06:49:32.47 |
+81:14:36.4 |
HIP 33548 |
27.78 |
| 2026-05-28 12:00 |
06:49:46.75 |
+81:14:13.4 |
HIP 33548 |
27.12 |
| 2026-05-29 00:00 |
06:50:01.09 |
+81:13:50.6 |
HIP 33548 |
26.46 |
| 2026-05-29 12:00 |
06:50:15.49 |
+81:13:27.9 |
HIP 33548 |
25.80 |
| 2026-05-30 00:00 |
06:50:29.95 |
+81:13:05.5 |
HIP 33548 |
25.14 |
| 2026-05-30 12:00 |
06:50:44.48 |
+81:12:43.3 |
HIP 33548 |
24.48 |
| 2026-05-31 00:00 |
06:50:59.06 |
+81:12:21.3 |
HIP 33548 |
23.82 |
| 2026-05-31 12:00 |
06:51:13.71 |
+81:11:59.5 |
HIP 33548 |
23.17 |
| 2026-06-01 00:00 |
06:51:28.41 |
+81:11:37.9 |
HIP 33548 |
22.51 |
| 2026-06-01 12:00 |
06:51:43.17 |
+81:11:16.5 |
HIP 33548 |
21.86 |
| 2026-06-02 00:00 |
06:51:57.98 |
+81:10:55.3 |
HIP 33548 |
21.21 |