| 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) |
| 2026-06-01 00:00 |
05:08:26.75 |
+07:08:17.4 |
HIP 23961 |
16.38 |
| 2026-06-01 12:00 |
05:08:29.20 |
+07:08:22.9 |
HIP 23961 |
16.16 |
| 2026-06-02 00:00 |
05:08:31.65 |
+07:08:28.3 |
HIP 23961 |
15.95 |
| 2026-06-02 12:00 |
05:08:34.11 |
+07:08:33.6 |
HIP 23961 |
15.76 |
| 2026-06-03 00:00 |
05:08:36.56 |
+07:08:38.9 |
HIP 23961 |
15.59 |
| 2026-06-03 12:00 |
05:08:39.02 |
+07:08:44.0 |
HIP 23961 |
15.45 |
| 2026-06-04 00:00 |
05:08:41.48 |
+07:08:49.1 |
HIP 23961 |
15.32 |
| 2026-06-04 12:00 |
05:08:43.94 |
+07:08:54.1 |
HIP 23961 |
15.22 |
| 2026-06-05 00:00 |
05:08:46.40 |
+07:08:59.0 |
HIP 24021 |
14.88 |
| 2026-06-05 12:00 |
05:08:48.86 |
+07:09:03.8 |
HIP 24021 |
14.26 |
| 2026-06-06 00:00 |
05:08:51.33 |
+07:09:08.6 |
HIP 24021 |
13.64 |
| 2026-06-06 12:00 |
05:08:53.80 |
+07:09:13.3 |
HIP 24021 |
13.03 |
| 2026-06-07 00:00 |
05:08:56.26 |
+07:09:17.9 |
HIP 24021 |
12.41 |
| 2026-06-07 12:00 |
05:08:58.73 |
+07:09:22.4 |
HIP 24021 |
11.79 |
| 2026-06-08 00:00 |
05:09:01.20 |
+07:09:26.8 |
HIP 24021 |
11.18 |
| 2026-06-08 12:00 |
05:09:03.67 |
+07:09:31.1 |
HIP 24021 |
10.56 |
| 2026-06-09 00:00 |
05:09:06.14 |
+07:09:35.4 |
HIP 24021 |
9.95 |
| 2026-06-09 12:00 |
05:09:08.61 |
+07:09:39.6 |
HIP 24021 |
9.33 |
| 2026-06-10 00:00 |
05:09:11.08 |
+07:09:43.7 |
HIP 24021 |
8.71 |
| 2026-06-10 12:00 |
05:09:13.54 |
+07:09:47.7 |
HIP 24021 |
8.10 |
| 2026-06-11 00:00 |
05:09:16.01 |
+07:09:51.6 |
HIP 24021 |
7.48 |
| 2026-06-11 12:00 |
05:09:18.48 |
+07:09:55.4 |
HIP 24021 |
6.87 |
| 2026-06-12 00:00 |
05:09:20.95 |
+07:09:59.2 |
HIP 24021 |
6.25 |
| 2026-06-12 12:00 |
05:09:23.42 |
+07:10:02.9 |
HIP 24021 |
5.64 |
| 2026-06-13 00:00 |
05:09:25.88 |
+07:10:06.5 |
HIP 24021 |
5.02 |
| 2026-06-13 12:00 |
05:09:28.35 |
+07:10:10.0 |
HIP 24021 |
4.41 |
| 2026-06-14 00:00 |
05:09:30.81 |
+07:10:13.4 |
HIP 24021 |
3.80 |
| 2026-06-14 12:00 |
05:09:33.27 |
+07:10:16.7 |
HIP 24021 |
3.19 |
| 2026-06-15 00:00 |
05:09:35.73 |
+07:10:19.9 |
HIP 24021 |
2.58 |
| 2026-06-15 12:00 |
05:09:38.19 |
+07:10:23.1 |
HIP 24021 |
1.98 |
| 2026-06-16 00:00 |
05:09:40.64 |
+07:10:26.2 |
HIP 24021 |
1.38 |
| 2026-06-16 12:00 |
05:09:43.10 |
+07:10:29.2 |
HIP 24021 |
0.80 |
| 2026-06-17 00:00 |
05:09:45.55 |
+07:10:32.1 |
HIP 24021 |
0.37 |
| 2026-06-17 12:00 |
05:09:48.00 |
+07:10:34.9 |
HIP 24021 |
0.61 |
| 2026-06-18 00:00 |
05:09:50.44 |
+07:10:37.6 |
HIP 24021 |
1.16 |
| 2026-06-18 12:00 |
05:09:52.89 |
+07:10:40.2 |
HIP 24021 |
1.75 |
| 2026-06-19 00:00 |
05:09:55.33 |
+07:10:42.8 |
HIP 24021 |
2.35 |
| 2026-06-19 12:00 |
05:09:57.76 |
+07:10:45.3 |
HIP 24021 |
2.95 |
| 2026-06-20 00:00 |
05:10:00.19 |
+07:10:47.6 |
HIP 24021 |
3.55 |
| 2026-06-20 12:00 |
05:10:02.62 |
+07:10:49.9 |
HIP 24021 |
4.15 |
| 2026-06-21 00:00 |
05:10:05.05 |
+07:10:52.1 |
HIP 24021 |
4.75 |
| 2026-06-21 12:00 |
05:10:07.47 |
+07:10:54.3 |
HIP 24021 |
5.35 |
| 2026-06-22 00:00 |
05:10:09.89 |
+07:10:56.3 |
HIP 24021 |
5.95 |