C/2003 K4 (LINEAR)
| Parameter |
Value |
| Designation |
C/2003 K4 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2004-10-13T17:15:09.331200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:30Z |
| Obs used |
3625 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
7.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2004-06-15.0000000 |
| e |
1.00030070 |
| q (au) |
1.023617 |
| a (au) |
-3404.074214 |
| i (deg) |
134.252518 |
| Ω (om, deg) |
18.675722 |
| ω (w, deg) |
198.442708 |
| M (ma, deg) |
-0.000599 |
Magnitude
Scatter + Global Linear
$$
M_a = (3.808 + 4.917\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
3.808 |
| n |
4.917 |
| gf |
1.000 |
| gb |
-0.895 |
| k |
0.998 |
| δ90 |
9.993 |
| 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 |
01:02:53.17 |
+07:04:23.1 |
HIP 4859 |
7.35 |
| 2026-02-03 12:00 |
01:02:54.27 |
+07:04:30.6 |
HIP 4859 |
7.64 |
| 2026-02-04 00:00 |
01:02:55.38 |
+07:04:38.3 |
HIP 4859 |
7.94 |
| 2026-02-04 12:00 |
01:02:56.51 |
+07:04:46.2 |
HIP 4859 |
8.24 |
| 2026-02-05 00:00 |
01:02:57.66 |
+07:04:54.1 |
HIP 4859 |
8.55 |
| 2026-02-05 12:00 |
01:02:58.83 |
+07:05:02.2 |
HIP 4859 |
8.86 |
| 2026-02-06 00:00 |
01:03:00.02 |
+07:05:10.4 |
HIP 4859 |
9.18 |
| 2026-02-06 12:00 |
01:03:01.23 |
+07:05:18.7 |
HIP 4859 |
9.51 |
| 2026-02-07 00:00 |
01:03:02.45 |
+07:05:27.1 |
HIP 4859 |
9.84 |
| 2026-02-07 12:00 |
01:03:03.70 |
+07:05:35.6 |
HIP 4859 |
10.17 |
| 2026-02-08 00:00 |
01:03:04.97 |
+07:05:44.3 |
HIP 4859 |
10.52 |
| 2026-02-08 12:00 |
01:03:06.25 |
+07:05:53.0 |
HIP 4859 |
10.86 |
| 2026-02-09 00:00 |
01:03:07.55 |
+07:06:01.9 |
HIP 4859 |
11.21 |
| 2026-02-09 12:00 |
01:03:08.88 |
+07:06:10.9 |
HIP 4859 |
11.57 |
| 2026-02-10 00:00 |
01:03:10.22 |
+07:06:20.1 |
HIP 4859 |
11.93 |
| 2026-02-10 12:00 |
01:03:11.58 |
+07:06:29.3 |
HIP 4859 |
12.30 |
| 2026-02-11 00:00 |
01:03:12.95 |
+07:06:38.6 |
HIP 4859 |
12.67 |
| 2026-02-11 12:00 |
01:03:14.35 |
+07:06:48.1 |
HIP 4859 |
13.05 |
| 2026-02-12 00:00 |
01:03:15.76 |
+07:06:57.7 |
HIP 4859 |
13.43 |
| 2026-02-12 12:00 |
01:03:17.19 |
+07:07:07.4 |
HIP 4859 |
13.82 |
| 2026-02-13 00:00 |
01:03:18.64 |
+07:07:17.2 |
HIP 4859 |
14.21 |
| 2026-02-13 12:00 |
01:03:20.11 |
+07:07:27.1 |
HIP 4859 |
14.61 |
| 2026-02-14 00:00 |
01:03:21.59 |
+07:07:37.1 |
HIP 4859 |
15.01 |
| 2026-02-14 12:00 |
01:03:23.09 |
+07:07:47.2 |
HIP 4859 |
15.41 |
| 2026-02-15 00:00 |
01:03:24.61 |
+07:07:57.4 |
HIP 4859 |
15.83 |
| 2026-02-15 12:00 |
01:03:26.15 |
+07:08:07.8 |
HIP 4859 |
16.24 |
| 2026-02-16 00:00 |
01:03:27.70 |
+07:08:18.2 |
HIP 4859 |
16.66 |
| 2026-02-16 12:00 |
01:03:29.27 |
+07:08:28.8 |
HIP 4859 |
17.09 |
| 2026-02-17 00:00 |
01:03:30.86 |
+07:08:39.4 |
HIP 4859 |
17.52 |
| 2026-02-17 12:00 |
01:03:32.46 |
+07:08:50.2 |
HIP 4859 |
17.95 |
| 2026-02-18 00:00 |
01:03:34.08 |
+07:09:01.0 |
HIP 4859 |
18.39 |
| 2026-02-18 12:00 |
01:03:35.72 |
+07:09:12.0 |
HIP 4859 |
18.83 |
| 2026-02-19 00:00 |
01:03:37.37 |
+07:09:23.0 |
HIP 5073 |
19.27 |
| 2026-02-19 12:00 |
01:03:39.04 |
+07:09:34.2 |
HIP 5073 |
18.95 |
| 2026-02-20 00:00 |
01:03:40.72 |
+07:09:45.4 |
HIP 5073 |
18.63 |
| 2026-02-20 12:00 |
01:03:42.42 |
+07:09:56.8 |
HIP 5073 |
18.31 |
| 2026-02-21 00:00 |
01:03:44.14 |
+07:10:08.2 |
HIP 5073 |
18.00 |
| 2026-02-21 12:00 |
01:03:45.87 |
+07:10:19.8 |
HIP 5073 |
17.69 |
| 2026-02-22 00:00 |
01:03:47.61 |
+07:10:31.4 |
HIP 5073 |
17.39 |
| 2026-02-22 12:00 |
01:03:49.37 |
+07:10:43.2 |
HIP 5073 |
17.09 |
| 2026-02-23 00:00 |
01:03:51.15 |
+07:10:55.0 |
HIP 5073 |
16.79 |
| 2026-02-23 12:00 |
01:03:52.94 |
+07:11:06.9 |
HIP 5073 |
16.51 |
| 2026-02-24 00:00 |
01:03:54.75 |
+07:11:18.9 |
HIP 5073 |
16.22 |