| 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) |
| 2026-06-01 00:00 |
23:06:45.10 |
+01:03:45.2 |
HIP 114005 |
26.34 |
| 2026-06-01 12:00 |
23:06:45.23 |
+01:03:50.2 |
HIP 114005 |
26.32 |
| 2026-06-02 00:00 |
23:06:45.34 |
+01:03:55.1 |
HIP 114005 |
26.30 |
| 2026-06-02 12:00 |
23:06:45.43 |
+01:03:59.8 |
HIP 114005 |
26.27 |
| 2026-06-03 00:00 |
23:06:45.50 |
+01:04:04.4 |
HIP 114005 |
26.24 |
| 2026-06-03 12:00 |
23:06:45.55 |
+01:04:08.9 |
HIP 114005 |
26.21 |
| 2026-06-04 00:00 |
23:06:45.58 |
+01:04:13.3 |
HIP 114005 |
26.18 |
| 2026-06-04 12:00 |
23:06:45.59 |
+01:04:17.5 |
HIP 114005 |
26.14 |
| 2026-06-05 00:00 |
23:06:45.58 |
+01:04:21.7 |
HIP 114005 |
26.10 |
| 2026-06-05 12:00 |
23:06:45.55 |
+01:04:25.7 |
HIP 114005 |
26.06 |
| 2026-06-06 00:00 |
23:06:45.50 |
+01:04:29.5 |
HIP 114005 |
26.02 |
| 2026-06-06 12:00 |
23:06:45.43 |
+01:04:33.3 |
HIP 114005 |
25.97 |
| 2026-06-07 00:00 |
23:06:45.34 |
+01:04:36.9 |
HIP 114005 |
25.92 |
| 2026-06-07 12:00 |
23:06:45.22 |
+01:04:40.4 |
HIP 114005 |
25.86 |
| 2026-06-08 00:00 |
23:06:45.09 |
+01:04:43.8 |
HIP 114005 |
25.80 |
| 2026-06-08 12:00 |
23:06:44.94 |
+01:04:47.0 |
HIP 114005 |
25.74 |
| 2026-06-09 00:00 |
23:06:44.76 |
+01:04:50.1 |
HIP 114005 |
25.68 |
| 2026-06-09 12:00 |
23:06:44.57 |
+01:04:53.1 |
HIP 114005 |
25.61 |
| 2026-06-10 00:00 |
23:06:44.35 |
+01:04:56.0 |
HIP 114005 |
25.54 |
| 2026-06-10 12:00 |
23:06:44.12 |
+01:04:58.7 |
HIP 114005 |
25.46 |
| 2026-06-11 00:00 |
23:06:43.86 |
+01:05:01.3 |
HIP 114005 |
25.39 |
| 2026-06-11 12:00 |
23:06:43.59 |
+01:05:03.8 |
HIP 114005 |
25.31 |
| 2026-06-12 00:00 |
23:06:43.29 |
+01:05:06.1 |
HIP 114005 |
25.22 |
| 2026-06-12 12:00 |
23:06:42.97 |
+01:05:08.3 |
HIP 114005 |
25.14 |
| 2026-06-13 00:00 |
23:06:42.64 |
+01:05:10.4 |
HIP 114005 |
25.05 |
| 2026-06-13 12:00 |
23:06:42.28 |
+01:05:12.4 |
HIP 114005 |
24.95 |
| 2026-06-14 00:00 |
23:06:41.90 |
+01:05:14.2 |
HIP 114005 |
24.86 |
| 2026-06-14 12:00 |
23:06:41.50 |
+01:05:15.9 |
HIP 114005 |
24.76 |
| 2026-06-15 00:00 |
23:06:41.08 |
+01:05:17.4 |
HIP 114005 |
24.66 |
| 2026-06-15 12:00 |
23:06:40.64 |
+01:05:18.9 |
HIP 114005 |
24.55 |
| 2026-06-16 00:00 |
23:06:40.18 |
+01:05:20.2 |
HIP 114005 |
24.44 |
| 2026-06-16 12:00 |
23:06:39.70 |
+01:05:21.3 |
HIP 114005 |
24.33 |
| 2026-06-17 00:00 |
23:06:39.20 |
+01:05:22.3 |
HIP 114005 |
24.21 |
| 2026-06-17 12:00 |
23:06:38.68 |
+01:05:23.2 |
HIP 114005 |
24.10 |
| 2026-06-18 00:00 |
23:06:38.13 |
+01:05:24.0 |
HIP 114005 |
23.98 |
| 2026-06-18 12:00 |
23:06:37.57 |
+01:05:24.6 |
HIP 114005 |
23.85 |
| 2026-06-19 00:00 |
23:06:36.99 |
+01:05:25.1 |
HIP 114005 |
23.73 |
| 2026-06-19 12:00 |
23:06:36.39 |
+01:05:25.5 |
HIP 114005 |
23.60 |
| 2026-06-20 00:00 |
23:06:35.76 |
+01:05:25.7 |
HIP 114005 |
23.47 |
| 2026-06-20 12:00 |
23:06:35.12 |
+01:05:25.8 |
HIP 114005 |
23.33 |
| 2026-06-21 00:00 |
23:06:34.46 |
+01:05:25.7 |
HIP 114005 |
23.19 |
| 2026-06-21 12:00 |
23:06:33.77 |
+01:05:25.6 |
HIP 114005 |
23.05 |
| 2026-06-22 00:00 |
23:06:33.07 |
+01:05:25.2 |
HIP 114005 |
22.91 |