C/1999 K4 (LINEAR)
| 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) |
| 2026-02-03 00:00 |
03:44:53.50 |
+16:18:48.8 |
HIP 17610 |
21.19 |
| 2026-02-03 12:00 |
03:44:52.43 |
+16:18:46.1 |
HIP 17610 |
21.45 |
| 2026-02-04 00:00 |
03:44:51.40 |
+16:18:43.4 |
HIP 17610 |
21.70 |
| 2026-02-04 12:00 |
03:44:50.41 |
+16:18:41.0 |
HIP 17610 |
21.95 |
| 2026-02-05 00:00 |
03:44:49.44 |
+16:18:38.6 |
HIP 17413 |
22.08 |
| 2026-02-05 12:00 |
03:44:48.51 |
+16:18:36.3 |
HIP 17413 |
21.91 |
| 2026-02-06 00:00 |
03:44:47.62 |
+16:18:34.2 |
HIP 17413 |
21.75 |
| 2026-02-06 12:00 |
03:44:46.75 |
+16:18:32.2 |
HIP 17413 |
21.60 |
| 2026-02-07 00:00 |
03:44:45.92 |
+16:18:30.3 |
HIP 17413 |
21.45 |
| 2026-02-07 12:00 |
03:44:45.13 |
+16:18:28.5 |
HIP 17413 |
21.31 |
| 2026-02-08 00:00 |
03:44:44.37 |
+16:18:26.8 |
HIP 17413 |
21.18 |
| 2026-02-08 12:00 |
03:44:43.64 |
+16:18:25.2 |
HIP 17413 |
21.06 |
| 2026-02-09 00:00 |
03:44:42.95 |
+16:18:23.8 |
HIP 17413 |
20.94 |
| 2026-02-09 12:00 |
03:44:42.29 |
+16:18:22.4 |
HIP 17413 |
20.83 |
| 2026-02-10 00:00 |
03:44:41.66 |
+16:18:21.2 |
HIP 17413 |
20.73 |
| 2026-02-10 12:00 |
03:44:41.07 |
+16:18:20.1 |
HIP 17413 |
20.63 |
| 2026-02-11 00:00 |
03:44:40.51 |
+16:18:19.1 |
HIP 17413 |
20.54 |
| 2026-02-11 12:00 |
03:44:39.99 |
+16:18:18.2 |
HIP 17413 |
20.46 |
| 2026-02-12 00:00 |
03:44:39.50 |
+16:18:17.5 |
HIP 17413 |
20.39 |
| 2026-02-12 12:00 |
03:44:39.05 |
+16:18:16.8 |
HIP 17413 |
20.32 |
| 2026-02-13 00:00 |
03:44:38.62 |
+16:18:16.3 |
HIP 17413 |
20.25 |
| 2026-02-13 12:00 |
03:44:38.24 |
+16:18:15.9 |
HIP 17413 |
20.20 |
| 2026-02-14 00:00 |
03:44:37.88 |
+16:18:15.6 |
HIP 17413 |
20.15 |
| 2026-02-14 12:00 |
03:44:37.56 |
+16:18:15.4 |
HIP 17413 |
20.10 |
| 2026-02-15 00:00 |
03:44:37.28 |
+16:18:15.3 |
HIP 17413 |
20.06 |
| 2026-02-15 12:00 |
03:44:37.03 |
+16:18:15.3 |
HIP 17413 |
20.03 |
| 2026-02-16 00:00 |
03:44:36.81 |
+16:18:15.5 |
HIP 17413 |
20.01 |
| 2026-02-16 12:00 |
03:44:36.63 |
+16:18:15.7 |
HIP 17413 |
19.99 |
| 2026-02-17 00:00 |
03:44:36.48 |
+16:18:16.1 |
HIP 17413 |
19.97 |
| 2026-02-17 12:00 |
03:44:36.36 |
+16:18:16.6 |
HIP 17413 |
19.96 |
| 2026-02-18 00:00 |
03:44:36.28 |
+16:18:17.1 |
HIP 17413 |
19.96 |
| 2026-02-18 12:00 |
03:44:36.23 |
+16:18:17.8 |
HIP 17413 |
19.97 |
| 2026-02-19 00:00 |
03:44:36.22 |
+16:18:18.6 |
HIP 17413 |
19.98 |
| 2026-02-19 12:00 |
03:44:36.24 |
+16:18:19.6 |
HIP 17413 |
19.99 |
| 2026-02-20 00:00 |
03:44:36.29 |
+16:18:20.6 |
HIP 17413 |
20.01 |
| 2026-02-20 12:00 |
03:44:36.38 |
+16:18:21.7 |
HIP 17413 |
20.04 |
| 2026-02-21 00:00 |
03:44:36.50 |
+16:18:22.9 |
HIP 17413 |
20.07 |
| 2026-02-21 12:00 |
03:44:36.66 |
+16:18:24.3 |
HIP 17413 |
20.11 |
| 2026-02-22 00:00 |
03:44:36.85 |
+16:18:25.7 |
HIP 17413 |
20.16 |
| 2026-02-22 12:00 |
03:44:37.07 |
+16:18:27.3 |
HIP 17413 |
20.21 |
| 2026-02-23 00:00 |
03:44:37.32 |
+16:18:28.9 |
HIP 17413 |
20.26 |
| 2026-02-23 12:00 |
03:44:37.61 |
+16:18:30.7 |
HIP 17413 |
20.32 |
| 2026-02-24 00:00 |
03:44:37.93 |
+16:18:32.6 |
HIP 17413 |
20.39 |