| Parameter |
Value |
| Designation |
C/1999 L2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1999-08-04T21:14:58.248960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:00Z |
| Obs used |
94 |
| NEO |
- |
| M1 |
13.000 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1999-06-22.0000000 |
| e |
0.99514569 |
| q (au) |
1.904764 |
| a (au) |
392.386280 |
| i (deg) |
43.941726 |
| Ω (om, deg) |
94.289819 |
| ω (w, deg) |
178.715840 |
| M (ma, deg) |
359.994435 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.743 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.743 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
05:14:08.99 |
+06:56:33.3 |
HIP 24510 |
20.42 |
| 2026-09-20 12:00 |
05:14:08.69 |
+06:56:23.8 |
HIP 24510 |
20.54 |
| 2026-09-21 00:00 |
05:14:08.37 |
+06:56:14.4 |
HIP 24510 |
20.67 |
| 2026-09-21 12:00 |
05:14:08.02 |
+06:56:05.0 |
HIP 24510 |
20.80 |
| 2026-09-22 00:00 |
05:14:07.66 |
+06:55:55.5 |
HIP 24510 |
20.94 |
| 2026-09-22 12:00 |
05:14:07.27 |
+06:55:46.0 |
HIP 24510 |
21.09 |
| 2026-09-23 00:00 |
05:14:06.87 |
+06:55:36.6 |
HIP 24510 |
21.24 |
| 2026-09-23 12:00 |
05:14:06.44 |
+06:55:27.1 |
HIP 24510 |
21.40 |
| 2026-09-24 00:00 |
05:14:05.99 |
+06:55:17.6 |
HIP 24510 |
21.56 |
| 2026-09-24 12:00 |
05:14:05.53 |
+06:55:08.1 |
HIP 24510 |
21.72 |
| 2026-09-25 00:00 |
05:14:05.04 |
+06:54:58.5 |
HIP 24510 |
21.90 |
| 2026-09-25 12:00 |
05:14:04.53 |
+06:54:49.0 |
HIP 24510 |
22.07 |
| 2026-09-26 00:00 |
05:14:04.00 |
+06:54:39.5 |
HIP 24510 |
22.26 |
| 2026-09-26 12:00 |
05:14:03.45 |
+06:54:30.0 |
HIP 24510 |
22.45 |
| 2026-09-27 00:00 |
05:14:02.88 |
+06:54:20.4 |
HIP 24510 |
22.64 |
| 2026-09-27 12:00 |
05:14:02.28 |
+06:54:10.9 |
HIP 24510 |
22.84 |
| 2026-09-28 00:00 |
05:14:01.67 |
+06:54:01.3 |
HIP 24510 |
23.04 |
| 2026-09-28 12:00 |
05:14:01.04 |
+06:53:51.8 |
HIP 24510 |
23.25 |
| 2026-09-29 00:00 |
05:14:00.38 |
+06:53:42.2 |
HIP 24510 |
23.46 |
| 2026-09-29 12:00 |
05:13:59.71 |
+06:53:32.6 |
HIP 24510 |
23.68 |
| 2026-09-30 00:00 |
05:13:59.01 |
+06:53:23.1 |
HIP 24510 |
23.90 |
| 2026-09-30 12:00 |
05:13:58.30 |
+06:53:13.5 |
HIP 24510 |
24.13 |
| 2026-10-01 00:00 |
05:13:57.56 |
+06:53:04.0 |
HIP 24510 |
24.36 |
| 2026-10-01 12:00 |
05:13:56.81 |
+06:52:54.4 |
HIP 24510 |
24.60 |
| 2026-10-02 00:00 |
05:13:56.03 |
+06:52:44.9 |
HIP 24510 |
24.84 |
| 2026-10-02 12:00 |
05:13:55.23 |
+06:52:35.3 |
HIP 24510 |
25.09 |
| 2026-10-03 00:00 |
05:13:54.41 |
+06:52:25.8 |
HIP 24510 |
25.34 |
| 2026-10-03 12:00 |
05:13:53.58 |
+06:52:16.2 |
HIP 24510 |
25.60 |
| 2026-10-04 00:00 |
05:13:52.72 |
+06:52:06.7 |
HIP 24510 |
25.86 |
| 2026-10-04 12:00 |
05:13:51.84 |
+06:51:57.1 |
HIP 24229 |
25.83 |
| 2026-10-05 00:00 |
05:13:50.94 |
+06:51:47.6 |
HIP 24229 |
25.60 |
| 2026-10-05 12:00 |
05:13:50.02 |
+06:51:38.1 |
HIP 24229 |
25.37 |
| 2026-10-06 00:00 |
05:13:49.09 |
+06:51:28.6 |
HIP 24229 |
25.14 |
| 2026-10-06 12:00 |
05:13:48.13 |
+06:51:19.1 |
HIP 24229 |
24.90 |
| 2026-10-07 00:00 |
05:13:47.15 |
+06:51:09.6 |
HIP 24229 |
24.66 |
| 2026-10-07 12:00 |
05:13:46.15 |
+06:51:00.1 |
HIP 24229 |
24.42 |
| 2026-10-08 00:00 |
05:13:45.13 |
+06:50:50.6 |
HIP 24229 |
24.17 |
| 2026-10-08 12:00 |
05:13:44.10 |
+06:50:41.2 |
HIP 24229 |
23.92 |
| 2026-10-09 00:00 |
05:13:43.04 |
+06:50:31.7 |
HIP 24229 |
23.66 |
| 2026-10-09 12:00 |
05:13:41.96 |
+06:50:22.3 |
HIP 24229 |
23.40 |
| 2026-10-10 00:00 |
05:13:40.86 |
+06:50:12.9 |
HIP 24229 |
23.14 |
| 2026-10-10 12:00 |
05:13:39.75 |
+06:50:03.5 |
HIP 24229 |
22.87 |
| 2026-10-11 00:00 |
05:13:38.61 |
+06:49:54.1 |
HIP 24229 |
22.60 |