| Parameter |
Value |
| Designation |
C/1999 K4 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1999-05-16T10:55:43.587840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:00Z |
| Obs used |
18 |
| NEO |
- |
| M1 |
18.500 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1999-05-20.0000000 |
| e |
0.91645495 |
| q (au) |
1.442437 |
| a (au) |
17.265376 |
| i (deg) |
120.773994 |
| Ω (om, deg) |
241.479276 |
| ω (w, deg) |
8.794388 |
| M (ma, deg) |
0.048698 |
Magnitude
Scatter + Global Linear
$$
M_a = (19.052 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
19.052 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.999 |
| 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) |
| 2026-03-26 00:00 |
03:45:53.92 |
+16:23:12.9 |
HIP 17610 |
6.43 |
| 2026-03-26 12:00 |
03:45:56.05 |
+16:23:19.9 |
HIP 17610 |
5.94 |
| 2026-03-27 00:00 |
03:45:58.20 |
+16:23:27.0 |
HIP 17610 |
5.45 |
| 2026-03-27 12:00 |
03:46:00.39 |
+16:23:34.2 |
HIP 17610 |
4.96 |
| 2026-03-28 00:00 |
03:46:02.59 |
+16:23:41.4 |
HIP 17610 |
4.48 |
| 2026-03-28 12:00 |
03:46:04.82 |
+16:23:48.7 |
HIP 17610 |
4.01 |
| 2026-03-29 00:00 |
03:46:07.07 |
+16:23:56.1 |
HIP 17610 |
3.55 |
| 2026-03-29 12:00 |
03:46:09.35 |
+16:24:03.5 |
HIP 17610 |
3.13 |
| 2026-03-30 00:00 |
03:46:11.65 |
+16:24:10.9 |
HIP 17610 |
2.75 |
| 2026-03-30 12:00 |
03:46:13.98 |
+16:24:18.4 |
HIP 17610 |
2.43 |
| 2026-03-31 00:00 |
03:46:16.33 |
+16:24:26.0 |
HIP 17610 |
2.23 |
| 2026-03-31 12:00 |
03:46:18.70 |
+16:24:33.6 |
HIP 17610 |
2.16 |
| 2026-04-01 00:00 |
03:46:21.10 |
+16:24:41.3 |
HIP 17610 |
2.25 |
| 2026-04-01 12:00 |
03:46:23.51 |
+16:24:49.1 |
HIP 17610 |
2.48 |
| 2026-04-02 00:00 |
03:46:25.95 |
+16:24:56.8 |
HIP 17610 |
2.82 |
| 2026-04-02 12:00 |
03:46:28.42 |
+16:25:04.7 |
HIP 17610 |
3.24 |
| 2026-04-03 00:00 |
03:46:30.90 |
+16:25:12.5 |
HIP 17610 |
3.72 |
| 2026-04-03 12:00 |
03:46:33.41 |
+16:25:20.5 |
HIP 17610 |
4.23 |
| 2026-04-04 00:00 |
03:46:35.94 |
+16:25:28.5 |
HIP 17610 |
4.78 |
| 2026-04-04 12:00 |
03:46:38.49 |
+16:25:36.5 |
HIP 17610 |
5.34 |
| 2026-04-05 00:00 |
03:46:41.06 |
+16:25:44.6 |
HIP 17610 |
5.92 |
| 2026-04-05 12:00 |
03:46:43.65 |
+16:25:52.7 |
HIP 17610 |
6.52 |
| 2026-04-06 00:00 |
03:46:46.27 |
+16:26:00.9 |
HIP 17610 |
7.13 |
| 2026-04-06 12:00 |
03:46:48.90 |
+16:26:09.1 |
HIP 17610 |
7.75 |
| 2026-04-07 00:00 |
03:46:51.56 |
+16:26:17.3 |
HIP 17610 |
8.38 |
| 2026-04-07 12:00 |
03:46:54.24 |
+16:26:25.6 |
HIP 17610 |
9.01 |
| 2026-04-08 00:00 |
03:46:56.94 |
+16:26:34.0 |
HIP 17610 |
9.65 |
| 2026-04-08 12:00 |
03:46:59.65 |
+16:26:42.3 |
HIP 17610 |
10.30 |
| 2026-04-09 00:00 |
03:47:02.39 |
+16:26:50.8 |
HIP 17610 |
10.96 |
| 2026-04-09 12:00 |
03:47:05.15 |
+16:26:59.2 |
HIP 17610 |
11.62 |
| 2026-04-10 00:00 |
03:47:07.93 |
+16:27:07.7 |
HIP 17610 |
12.29 |
| 2026-04-10 12:00 |
03:47:10.72 |
+16:27:16.3 |
HIP 17610 |
12.97 |
| 2026-04-11 00:00 |
03:47:13.54 |
+16:27:24.8 |
HIP 17610 |
13.65 |
| 2026-04-11 12:00 |
03:47:16.37 |
+16:27:33.5 |
HIP 17610 |
14.33 |
| 2026-04-12 00:00 |
03:47:19.23 |
+16:27:42.1 |
HIP 17610 |
15.02 |
| 2026-04-12 12:00 |
03:47:22.10 |
+16:27:50.8 |
HIP 17708 |
14.80 |
| 2026-04-13 00:00 |
03:47:24.99 |
+16:27:59.5 |
HIP 17708 |
14.53 |
| 2026-04-13 12:00 |
03:47:27.90 |
+16:28:08.2 |
HIP 17708 |
14.30 |
| 2026-04-14 00:00 |
03:47:30.82 |
+16:28:17.0 |
HIP 17708 |
14.10 |
| 2026-04-14 12:00 |
03:47:33.77 |
+16:28:25.8 |
HIP 17708 |
13.92 |
| 2026-04-15 00:00 |
03:47:36.73 |
+16:28:34.7 |
HIP 17708 |
13.79 |
| 2026-04-15 12:00 |
03:47:39.71 |
+16:28:43.5 |
HIP 17708 |
13.69 |
| 2026-04-16 00:00 |
03:47:42.71 |
+16:28:52.4 |
HIP 17708 |
13.63 |