| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
06:52:12.85 |
+81:10:34.4 |
HIP 33548 |
20.56 |
| 2026-06-03 00:00 |
06:52:27.77 |
+81:10:13.6 |
HIP 33548 |
19.91 |
| 2026-06-03 12:00 |
06:52:42.75 |
+81:09:53.1 |
HIP 33548 |
19.27 |
| 2026-06-04 00:00 |
06:52:57.78 |
+81:09:32.8 |
HIP 33548 |
18.63 |
| 2026-06-04 12:00 |
06:53:12.87 |
+81:09:12.7 |
HIP 33548 |
17.99 |
| 2026-06-05 00:00 |
06:53:28.00 |
+81:08:52.8 |
HIP 33548 |
17.35 |
| 2026-06-05 12:00 |
06:53:43.19 |
+81:08:33.2 |
HIP 33548 |
16.72 |
| 2026-06-06 00:00 |
06:53:58.43 |
+81:08:13.7 |
HIP 33548 |
16.10 |
| 2026-06-06 12:00 |
06:54:13.71 |
+81:07:54.5 |
HIP 33548 |
15.48 |
| 2026-06-07 00:00 |
06:54:29.05 |
+81:07:35.5 |
HIP 33548 |
14.87 |
| 2026-06-07 12:00 |
06:54:44.43 |
+81:07:16.7 |
HIP 33548 |
14.26 |
| 2026-06-08 00:00 |
06:54:59.85 |
+81:06:58.1 |
HIP 33548 |
13.66 |
| 2026-06-08 12:00 |
06:55:15.33 |
+81:06:39.8 |
HIP 33548 |
13.07 |
| 2026-06-09 00:00 |
06:55:30.85 |
+81:06:21.7 |
HIP 33548 |
12.50 |
| 2026-06-09 12:00 |
06:55:46.41 |
+81:06:03.8 |
HIP 33548 |
11.93 |
| 2026-06-10 00:00 |
06:56:02.02 |
+81:05:46.1 |
HIP 33548 |
11.38 |
| 2026-06-10 12:00 |
06:56:17.67 |
+81:05:28.7 |
HIP 33548 |
10.84 |
| 2026-06-11 00:00 |
06:56:33.36 |
+81:05:11.4 |
HIP 33548 |
10.33 |
| 2026-06-11 12:00 |
06:56:49.09 |
+81:04:54.4 |
HIP 33548 |
9.84 |
| 2026-06-12 00:00 |
06:57:04.87 |
+81:04:37.7 |
HIP 33548 |
9.37 |
| 2026-06-12 12:00 |
06:57:20.68 |
+81:04:21.1 |
HIP 33548 |
8.93 |
| 2026-06-13 00:00 |
06:57:36.53 |
+81:04:04.8 |
HIP 33548 |
8.53 |
| 2026-06-13 12:00 |
06:57:52.42 |
+81:03:48.7 |
HIP 33548 |
8.17 |
| 2026-06-14 00:00 |
06:58:08.35 |
+81:03:32.9 |
HIP 33548 |
7.85 |
| 2026-06-14 12:00 |
06:58:24.31 |
+81:03:17.3 |
HIP 33548 |
7.59 |
| 2026-06-15 00:00 |
06:58:40.30 |
+81:03:01.9 |
HIP 33548 |
7.38 |
| 2026-06-15 12:00 |
06:58:56.33 |
+81:02:46.7 |
HIP 33548 |
7.23 |
| 2026-06-16 00:00 |
06:59:12.40 |
+81:02:31.8 |
HIP 33548 |
7.15 |
| 2026-06-16 12:00 |
06:59:28.49 |
+81:02:17.1 |
HIP 33548 |
7.13 |
| 2026-06-17 00:00 |
06:59:44.62 |
+81:02:02.7 |
HIP 33548 |
7.19 |
| 2026-06-17 12:00 |
07:00:00.78 |
+81:01:48.4 |
HIP 33548 |
7.31 |
| 2026-06-18 00:00 |
07:00:16.96 |
+81:01:34.4 |
HIP 33548 |
7.49 |
| 2026-06-18 12:00 |
07:00:33.18 |
+81:01:20.7 |
HIP 33548 |
7.74 |
| 2026-06-19 00:00 |
07:00:49.42 |
+81:01:07.2 |
HIP 33548 |
8.03 |
| 2026-06-19 12:00 |
07:01:05.69 |
+81:00:53.9 |
HIP 33548 |
8.38 |
| 2026-06-20 00:00 |
07:01:21.98 |
+81:00:40.9 |
HIP 33548 |
8.76 |
| 2026-06-20 12:00 |
07:01:38.30 |
+81:00:28.1 |
HIP 33548 |
9.19 |
| 2026-06-21 00:00 |
07:01:54.64 |
+81:00:15.5 |
HIP 33548 |
9.64 |
| 2026-06-21 12:00 |
07:02:11.01 |
+81:00:03.2 |
HIP 33548 |
10.12 |
| 2026-06-22 00:00 |
07:02:27.40 |
+80:59:51.1 |
HIP 33548 |
10.63 |