| Parameter |
Value |
| Designation |
C/1999 L3 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-01-04T21:48:00.221760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:00Z |
| Obs used |
340 |
| NEO |
- |
| M1 |
8.300 |
| K1 |
15.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1999-12-24.0000000 |
| e |
0.97436453 |
| q (au) |
1.988918 |
| a (au) |
77.584594 |
| i (deg) |
166.099275 |
| Ω (om, deg) |
140.161317 |
| ω (w, deg) |
353.297874 |
| M (ma, deg) |
359.982825 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.988 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.988 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.905 |
| k |
1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 1999-06-09 |
2000-01-04 |
+8.4713 |
-3.326 |
| 2000-01-05 |
2000-04-23 |
-5.4078 |
+1.574 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
23:03:49.84 |
+00:38:51.3 |
HIP 113770 |
24.77 |
| 2026-03-26 12:00 |
23:03:52.01 |
+00:39:05.9 |
HIP 113770 |
25.36 |
| 2026-03-27 00:00 |
23:03:54.18 |
+00:39:20.6 |
HIP 113770 |
25.95 |
| 2026-03-27 12:00 |
23:03:56.34 |
+00:39:35.2 |
HIP 113770 |
26.54 |
| 2026-03-28 00:00 |
23:03:58.49 |
+00:39:49.9 |
HIP 113770 |
27.13 |
| 2026-03-28 12:00 |
23:04:00.63 |
+00:40:04.5 |
HIP 113770 |
27.72 |
| 2026-03-29 00:00 |
23:04:02.76 |
+00:40:19.1 |
HIP 113770 |
28.30 |
| 2026-03-29 12:00 |
23:04:04.89 |
+00:40:33.6 |
HIP 113770 |
28.88 |
| 2026-03-30 00:00 |
23:04:07.01 |
+00:40:48.2 |
HIP 113770 |
29.46 |
| 2026-03-30 12:00 |
23:04:09.11 |
+00:41:02.8 |
HIP 113770 |
30.04 |
| 2026-03-31 00:00 |
23:04:11.22 |
+00:41:17.3 |
HIP 113770 |
30.62 |
| 2026-03-31 12:00 |
23:04:13.31 |
+00:41:31.8 |
HIP 113770 |
31.19 |
| 2026-04-01 00:00 |
23:04:15.39 |
+00:41:46.3 |
HIP 113770 |
31.76 |
| 2026-04-01 12:00 |
23:04:17.47 |
+00:42:00.8 |
HIP 113770 |
32.33 |
| 2026-04-02 00:00 |
23:04:19.53 |
+00:42:15.2 |
HIP 113770 |
32.90 |
| 2026-04-02 12:00 |
23:04:21.59 |
+00:42:29.7 |
HIP 113770 |
33.47 |
| 2026-04-03 00:00 |
23:04:23.64 |
+00:42:44.1 |
HIP 113770 |
34.03 |
| 2026-04-03 12:00 |
23:04:25.67 |
+00:42:58.5 |
HIP 113770 |
34.60 |
| 2026-04-04 00:00 |
23:04:27.70 |
+00:43:12.8 |
HIP 113770 |
35.16 |
| 2026-04-04 12:00 |
23:04:29.72 |
+00:43:27.2 |
HIP 113770 |
35.71 |
| 2026-04-05 00:00 |
23:04:31.73 |
+00:43:41.5 |
HIP 113770 |
36.27 |
| 2026-04-05 12:00 |
23:04:33.73 |
+00:43:55.7 |
HIP 114005 |
36.20 |
| 2026-04-06 00:00 |
23:04:35.71 |
+00:44:10.0 |
HIP 114005 |
35.83 |
| 2026-04-06 12:00 |
23:04:37.69 |
+00:44:24.2 |
HIP 114005 |
35.46 |
| 2026-04-07 00:00 |
23:04:39.66 |
+00:44:38.4 |
HIP 114005 |
35.10 |
| 2026-04-07 12:00 |
23:04:41.62 |
+00:44:52.5 |
HIP 114005 |
34.74 |
| 2026-04-08 00:00 |
23:04:43.56 |
+00:45:06.7 |
HIP 114005 |
34.39 |
| 2026-04-08 12:00 |
23:04:45.50 |
+00:45:20.7 |
HIP 114005 |
34.04 |
| 2026-04-09 00:00 |
23:04:47.42 |
+00:45:34.8 |
HIP 114005 |
33.71 |
| 2026-04-09 12:00 |
23:04:49.34 |
+00:45:48.8 |
HIP 114005 |
33.37 |
| 2026-04-10 00:00 |
23:04:51.24 |
+00:46:02.8 |
HIP 114005 |
33.05 |
| 2026-04-10 12:00 |
23:04:53.13 |
+00:46:16.7 |
HIP 114005 |
32.73 |
| 2026-04-11 00:00 |
23:04:55.01 |
+00:46:30.6 |
HIP 114005 |
32.42 |
| 2026-04-11 12:00 |
23:04:56.88 |
+00:46:44.4 |
HIP 114005 |
32.11 |
| 2026-04-12 00:00 |
23:04:58.73 |
+00:46:58.3 |
HIP 114005 |
31.81 |
| 2026-04-12 12:00 |
23:05:00.57 |
+00:47:12.0 |
HIP 114005 |
31.52 |
| 2026-04-13 00:00 |
23:05:02.41 |
+00:47:25.8 |
HIP 114005 |
31.23 |
| 2026-04-13 12:00 |
23:05:04.22 |
+00:47:39.4 |
HIP 114005 |
30.95 |
| 2026-04-14 00:00 |
23:05:06.03 |
+00:47:53.1 |
HIP 114005 |
30.68 |
| 2026-04-14 12:00 |
23:05:07.83 |
+00:48:06.6 |
HIP 114005 |
30.42 |
| 2026-04-15 00:00 |
23:05:09.61 |
+00:48:20.2 |
HIP 114005 |
30.16 |
| 2026-04-15 12:00 |
23:05:11.38 |
+00:48:33.7 |
HIP 114005 |
29.91 |
| 2026-04-16 00:00 |
23:05:13.13 |
+00:48:47.1 |
HIP 114005 |
29.67 |