C/2004 F2 (LINEAR)
| 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) |
| 2026-02-03 00:00 |
06:54:07.77 |
+83:17:07.4 |
HIP 34235 |
28.04 |
| 2026-02-03 12:00 |
06:53:45.97 |
+83:16:47.9 |
HIP 34235 |
28.72 |
| 2026-02-04 00:00 |
06:53:24.33 |
+83:16:28.1 |
HIP 34235 |
29.40 |
| 2026-02-04 12:00 |
06:53:02.84 |
+83:16:08.0 |
HIP 34235 |
30.08 |
| 2026-02-05 00:00 |
06:52:41.51 |
+83:15:47.5 |
HIP 34235 |
30.76 |
| 2026-02-05 12:00 |
06:52:20.33 |
+83:15:26.6 |
HIP 34235 |
31.45 |
| 2026-02-06 00:00 |
06:51:59.32 |
+83:15:05.5 |
HIP 34235 |
32.14 |
| 2026-02-06 12:00 |
06:51:38.48 |
+83:14:44.0 |
HIP 34235 |
32.83 |
| 2026-02-07 00:00 |
06:51:17.80 |
+83:14:22.1 |
HIP 34235 |
33.52 |
| 2026-02-07 12:00 |
06:50:57.28 |
+83:14:00.0 |
HIP 34235 |
34.21 |
| 2026-02-08 00:00 |
06:50:36.94 |
+83:13:37.5 |
HIP 34235 |
34.91 |
| 2026-02-08 12:00 |
06:50:16.76 |
+83:13:14.7 |
HIP 34235 |
35.60 |
| 2026-02-09 00:00 |
06:49:56.76 |
+83:12:51.6 |
HIP 34235 |
36.29 |
| 2026-02-09 12:00 |
06:49:36.93 |
+83:12:28.2 |
HIP 34235 |
36.99 |
| 2026-02-10 00:00 |
06:49:17.28 |
+83:12:04.4 |
HIP 34235 |
37.68 |
| 2026-02-10 12:00 |
06:48:57.81 |
+83:11:40.4 |
HIP 34235 |
38.38 |
| 2026-02-11 00:00 |
06:48:38.52 |
+83:11:16.0 |
HIP 34235 |
39.07 |
| 2026-02-11 12:00 |
06:48:19.40 |
+83:10:51.3 |
HIP 34235 |
39.77 |
| 2026-02-12 00:00 |
06:48:00.47 |
+83:10:26.4 |
HIP 34235 |
40.46 |
| 2026-02-12 12:00 |
06:47:41.73 |
+83:10:01.1 |
HIP 34235 |
41.16 |
| 2026-02-13 00:00 |
06:47:23.17 |
+83:09:35.6 |
HIP 31429 |
41.81 |
| 2026-02-13 12:00 |
06:47:04.80 |
+83:09:09.7 |
HIP 31429 |
41.93 |
| 2026-02-14 00:00 |
06:46:46.61 |
+83:08:43.6 |
HIP 31429 |
42.07 |
| 2026-02-14 12:00 |
06:46:28.62 |
+83:08:17.2 |
HIP 31429 |
42.23 |
| 2026-02-15 00:00 |
06:46:10.82 |
+83:07:50.5 |
HIP 31429 |
42.40 |
| 2026-02-15 12:00 |
06:45:53.21 |
+83:07:23.5 |
HIP 32363 |
42.38 |
| 2026-02-16 00:00 |
06:45:35.79 |
+83:06:56.2 |
HIP 32363 |
41.92 |
| 2026-02-16 12:00 |
06:45:18.57 |
+83:06:28.7 |
HIP 32363 |
41.46 |
| 2026-02-17 00:00 |
06:45:01.55 |
+83:06:00.9 |
HIP 32363 |
41.00 |
| 2026-02-17 12:00 |
06:44:44.72 |
+83:05:32.9 |
HIP 32363 |
40.54 |
| 2026-02-18 00:00 |
06:44:28.09 |
+83:05:04.6 |
HIP 32363 |
40.08 |
| 2026-02-18 12:00 |
06:44:11.67 |
+83:04:36.0 |
HIP 32363 |
39.63 |
| 2026-02-19 00:00 |
06:43:55.44 |
+83:04:07.2 |
HIP 32363 |
39.18 |
| 2026-02-19 12:00 |
06:43:39.42 |
+83:03:38.1 |
HIP 32363 |
38.74 |
| 2026-02-20 00:00 |
06:43:23.59 |
+83:03:08.8 |
HIP 32363 |
38.29 |
| 2026-02-20 12:00 |
06:43:07.97 |
+83:02:39.3 |
HIP 32363 |
37.85 |
| 2026-02-21 00:00 |
06:42:52.56 |
+83:02:09.5 |
HIP 32363 |
37.42 |
| 2026-02-21 12:00 |
06:42:37.35 |
+83:01:39.4 |
HIP 32363 |
36.98 |
| 2026-02-22 00:00 |
06:42:22.35 |
+83:01:09.2 |
HIP 32363 |
36.55 |
| 2026-02-22 12:00 |
06:42:07.55 |
+83:00:38.7 |
HIP 32363 |
36.13 |
| 2026-02-23 00:00 |
06:41:52.96 |
+83:00:08.0 |
HIP 32363 |
35.70 |
| 2026-02-23 12:00 |
06:41:38.58 |
+82:59:37.1 |
HIP 32363 |
35.29 |
| 2026-02-24 00:00 |
06:41:24.40 |
+82:59:05.9 |
HIP 32363 |
34.87 |