| 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) |
| 2026-05-12 00:00 |
03:50:36.10 |
+16:36:51.4 |
HIP 17830 |
25.67 |
| 2026-05-12 12:00 |
03:50:39.66 |
+16:37:00.5 |
HIP 17830 |
26.52 |
| 2026-05-13 00:00 |
03:50:43.23 |
+16:37:09.6 |
HIP 17830 |
27.37 |
| 2026-05-13 12:00 |
03:50:46.80 |
+16:37:18.7 |
HIP 17830 |
28.23 |
| 2026-05-14 00:00 |
03:50:50.38 |
+16:37:27.8 |
HIP 17830 |
29.09 |
| 2026-05-14 12:00 |
03:50:53.96 |
+16:37:36.9 |
HIP 17830 |
29.95 |
| 2026-05-15 00:00 |
03:50:57.54 |
+16:37:45.9 |
HIP 17830 |
30.80 |
| 2026-05-15 12:00 |
03:51:01.13 |
+16:37:54.9 |
HIP 17830 |
31.67 |
| 2026-05-16 00:00 |
03:51:04.72 |
+16:38:03.9 |
HIP 17830 |
32.53 |
| 2026-05-16 12:00 |
03:51:08.31 |
+16:38:12.9 |
HIP 17830 |
33.39 |
| 2026-05-17 00:00 |
03:51:11.90 |
+16:38:21.8 |
HIP 17830 |
34.25 |
| 2026-05-17 12:00 |
03:51:15.50 |
+16:38:30.7 |
HIP 17830 |
35.12 |
| 2026-05-18 00:00 |
03:51:19.10 |
+16:38:39.6 |
HIP 17830 |
35.99 |
| 2026-05-18 12:00 |
03:51:22.70 |
+16:38:48.5 |
HIP 17830 |
36.85 |
| 2026-05-19 00:00 |
03:51:26.30 |
+16:38:57.3 |
HIP 18222 |
37.39 |
| 2026-05-19 12:00 |
03:51:29.90 |
+16:39:06.1 |
HIP 18222 |
36.56 |
| 2026-05-20 00:00 |
03:51:33.50 |
+16:39:14.9 |
HIP 18222 |
35.73 |
| 2026-05-20 12:00 |
03:51:37.11 |
+16:39:23.6 |
HIP 18222 |
34.90 |
| 2026-05-21 00:00 |
03:51:40.71 |
+16:39:32.3 |
HIP 18222 |
34.07 |
| 2026-05-21 12:00 |
03:51:44.32 |
+16:39:41.0 |
HIP 18222 |
33.24 |
| 2026-05-22 00:00 |
03:51:47.92 |
+16:39:49.6 |
HIP 18222 |
32.42 |
| 2026-05-22 12:00 |
03:51:51.52 |
+16:39:58.2 |
HIP 18222 |
31.60 |
| 2026-05-23 00:00 |
03:51:55.13 |
+16:40:06.8 |
HIP 18222 |
30.78 |
| 2026-05-23 12:00 |
03:51:58.73 |
+16:40:15.4 |
HIP 18222 |
29.97 |
| 2026-05-24 00:00 |
03:52:02.33 |
+16:40:23.9 |
HIP 18222 |
29.16 |
| 2026-05-24 12:00 |
03:52:05.93 |
+16:40:32.3 |
HIP 18222 |
28.36 |
| 2026-05-25 00:00 |
03:52:09.53 |
+16:40:40.8 |
HIP 18222 |
27.56 |
| 2026-05-25 12:00 |
03:52:13.13 |
+16:40:49.2 |
HIP 18222 |
26.77 |
| 2026-05-26 00:00 |
03:52:16.72 |
+16:40:57.5 |
HIP 18222 |
25.98 |
| 2026-05-26 12:00 |
03:52:20.31 |
+16:41:05.8 |
HIP 18222 |
25.20 |
| 2026-05-27 00:00 |
03:52:23.90 |
+16:41:14.1 |
HIP 18222 |
24.42 |
| 2026-05-27 12:00 |
03:52:27.49 |
+16:41:22.4 |
HIP 18222 |
23.66 |
| 2026-05-28 00:00 |
03:52:31.07 |
+16:41:30.5 |
HIP 18222 |
22.90 |
| 2026-05-28 12:00 |
03:52:34.65 |
+16:41:38.7 |
HIP 18222 |
22.15 |
| 2026-05-29 00:00 |
03:52:38.23 |
+16:41:46.8 |
HIP 18222 |
21.41 |
| 2026-05-29 12:00 |
03:52:41.81 |
+16:41:54.9 |
HIP 18222 |
20.68 |
| 2026-05-30 00:00 |
03:52:45.38 |
+16:42:02.9 |
HIP 18222 |
19.96 |
| 2026-05-30 12:00 |
03:52:48.94 |
+16:42:10.9 |
HIP 18222 |
19.26 |
| 2026-05-31 00:00 |
03:52:52.50 |
+16:42:18.8 |
HIP 18222 |
18.57 |
| 2026-05-31 12:00 |
03:52:56.06 |
+16:42:26.7 |
HIP 18222 |
17.90 |
| 2026-06-01 00:00 |
03:52:59.61 |
+16:42:34.6 |
HIP 18222 |
17.25 |
| 2026-06-01 12:00 |
03:53:03.16 |
+16:42:42.4 |
HIP 18222 |
16.62 |
| 2026-06-02 00:00 |
03:53:06.70 |
+16:42:50.1 |
HIP 18222 |
16.01 |