| 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) |
| 2026-05-12 00:00 |
01:09:44.44 |
+07:49:42.2 |
HIP 5382 |
22.40 |
| 2026-05-12 12:00 |
01:09:46.49 |
+07:49:55.9 |
HIP 5382 |
22.89 |
| 2026-05-13 00:00 |
01:09:48.54 |
+07:50:09.6 |
HIP 5562 |
22.42 |
| 2026-05-13 12:00 |
01:09:50.57 |
+07:50:23.2 |
HIP 5562 |
21.92 |
| 2026-05-14 00:00 |
01:09:52.59 |
+07:50:36.7 |
HIP 5562 |
21.43 |
| 2026-05-14 12:00 |
01:09:54.60 |
+07:50:50.2 |
HIP 5562 |
20.94 |
| 2026-05-15 00:00 |
01:09:56.59 |
+07:51:03.6 |
HIP 5562 |
20.46 |
| 2026-05-15 12:00 |
01:09:58.58 |
+07:51:16.9 |
HIP 5562 |
19.99 |
| 2026-05-16 00:00 |
01:10:00.55 |
+07:51:30.2 |
HIP 5562 |
19.52 |
| 2026-05-16 12:00 |
01:10:02.51 |
+07:51:43.4 |
HIP 5562 |
19.06 |
| 2026-05-17 00:00 |
01:10:04.46 |
+07:51:56.5 |
HIP 5562 |
18.61 |
| 2026-05-17 12:00 |
01:10:06.39 |
+07:52:09.5 |
HIP 5562 |
18.16 |
| 2026-05-18 00:00 |
01:10:08.32 |
+07:52:22.4 |
HIP 5562 |
17.72 |
| 2026-05-18 12:00 |
01:10:10.23 |
+07:52:35.3 |
HIP 5562 |
17.29 |
| 2026-05-19 00:00 |
01:10:12.12 |
+07:52:48.1 |
HIP 5562 |
16.86 |
| 2026-05-19 12:00 |
01:10:14.01 |
+07:53:00.8 |
HIP 5562 |
16.44 |
| 2026-05-20 00:00 |
01:10:15.88 |
+07:53:13.5 |
HIP 5562 |
16.04 |
| 2026-05-20 12:00 |
01:10:17.73 |
+07:53:26.0 |
HIP 5562 |
15.64 |
| 2026-05-21 00:00 |
01:10:19.57 |
+07:53:38.5 |
HIP 5562 |
15.25 |
| 2026-05-21 12:00 |
01:10:21.40 |
+07:53:50.9 |
HIP 5562 |
14.87 |
| 2026-05-22 00:00 |
01:10:23.22 |
+07:54:03.2 |
HIP 5562 |
14.50 |
| 2026-05-22 12:00 |
01:10:25.02 |
+07:54:15.5 |
HIP 5562 |
14.14 |
| 2026-05-23 00:00 |
01:10:26.81 |
+07:54:27.6 |
HIP 5562 |
13.79 |
| 2026-05-23 12:00 |
01:10:28.58 |
+07:54:39.7 |
HIP 5562 |
13.45 |
| 2026-05-24 00:00 |
01:10:30.34 |
+07:54:51.6 |
HIP 5562 |
13.12 |
| 2026-05-24 12:00 |
01:10:32.09 |
+07:55:03.5 |
HIP 5562 |
12.81 |
| 2026-05-25 00:00 |
01:10:33.82 |
+07:55:15.3 |
HIP 5562 |
12.51 |
| 2026-05-25 12:00 |
01:10:35.53 |
+07:55:27.0 |
HIP 5562 |
12.22 |
| 2026-05-26 00:00 |
01:10:37.23 |
+07:55:38.7 |
HIP 5562 |
11.95 |
| 2026-05-26 12:00 |
01:10:38.92 |
+07:55:50.2 |
HIP 5562 |
11.69 |
| 2026-05-27 00:00 |
01:10:40.59 |
+07:56:01.7 |
HIP 5562 |
11.44 |
| 2026-05-27 12:00 |
01:10:42.24 |
+07:56:13.0 |
HIP 5562 |
11.21 |
| 2026-05-28 00:00 |
01:10:43.89 |
+07:56:24.3 |
HIP 5562 |
11.00 |
| 2026-05-28 12:00 |
01:10:45.51 |
+07:56:35.5 |
HIP 5562 |
10.80 |
| 2026-05-29 00:00 |
01:10:47.12 |
+07:56:46.5 |
HIP 5562 |
10.62 |
| 2026-05-29 12:00 |
01:10:48.72 |
+07:56:57.5 |
HIP 5562 |
10.46 |
| 2026-05-30 00:00 |
01:10:50.29 |
+07:57:08.4 |
HIP 5562 |
10.31 |
| 2026-05-30 12:00 |
01:10:51.86 |
+07:57:19.2 |
HIP 5562 |
10.18 |
| 2026-05-31 00:00 |
01:10:53.40 |
+07:57:29.9 |
HIP 5562 |
10.07 |
| 2026-05-31 12:00 |
01:10:54.94 |
+07:57:40.6 |
HIP 5562 |
9.98 |
| 2026-06-01 00:00 |
01:10:56.45 |
+07:57:51.1 |
HIP 5562 |
9.90 |
| 2026-06-01 12:00 |
01:10:57.95 |
+07:58:01.5 |
HIP 5562 |
9.85 |
| 2026-06-02 00:00 |
01:10:59.43 |
+07:58:11.8 |
HIP 5562 |
9.81 |