C/1999 L2 (LINEAR)
| 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) |
| 2026-02-03 00:00 |
05:04:51.30 |
+06:28:37.3 |
HIP 23701 |
12.20 |
| 2026-02-03 12:00 |
05:04:49.96 |
+06:28:45.5 |
HIP 23701 |
12.54 |
| 2026-02-04 00:00 |
05:04:48.63 |
+06:28:53.8 |
HIP 23701 |
12.88 |
| 2026-02-04 12:00 |
05:04:47.33 |
+06:29:02.2 |
HIP 23701 |
13.22 |
| 2026-02-05 00:00 |
05:04:46.04 |
+06:29:10.6 |
HIP 23701 |
13.55 |
| 2026-02-05 12:00 |
05:04:44.77 |
+06:29:19.1 |
HIP 23701 |
13.87 |
| 2026-02-06 00:00 |
05:04:43.52 |
+06:29:27.7 |
HIP 23701 |
14.20 |
| 2026-02-06 12:00 |
05:04:42.30 |
+06:29:36.4 |
HIP 23701 |
14.52 |
| 2026-02-07 00:00 |
05:04:41.09 |
+06:29:45.1 |
HIP 23701 |
14.83 |
| 2026-02-07 12:00 |
05:04:39.90 |
+06:29:53.9 |
HIP 23701 |
15.14 |
| 2026-02-08 00:00 |
05:04:38.73 |
+06:30:02.8 |
HIP 23701 |
15.45 |
| 2026-02-08 12:00 |
05:04:37.58 |
+06:30:11.7 |
HIP 23542 |
15.31 |
| 2026-02-09 00:00 |
05:04:36.45 |
+06:30:20.7 |
HIP 23542 |
14.99 |
| 2026-02-09 12:00 |
05:04:35.34 |
+06:30:29.7 |
HIP 23542 |
14.68 |
| 2026-02-10 00:00 |
05:04:34.26 |
+06:30:38.9 |
HIP 23542 |
14.37 |
| 2026-02-10 12:00 |
05:04:33.19 |
+06:30:48.1 |
HIP 23542 |
14.06 |
| 2026-02-11 00:00 |
05:04:32.14 |
+06:30:57.3 |
HIP 23542 |
13.76 |
| 2026-02-11 12:00 |
05:04:31.11 |
+06:31:06.7 |
HIP 23542 |
13.46 |
| 2026-02-12 00:00 |
05:04:30.11 |
+06:31:16.1 |
HIP 23542 |
13.17 |
| 2026-02-12 12:00 |
05:04:29.12 |
+06:31:25.5 |
HIP 23542 |
12.88 |
| 2026-02-13 00:00 |
05:04:28.16 |
+06:31:35.0 |
HIP 23542 |
12.59 |
| 2026-02-13 12:00 |
05:04:27.21 |
+06:31:44.6 |
HIP 23542 |
12.31 |
| 2026-02-14 00:00 |
05:04:26.29 |
+06:31:54.2 |
HIP 23542 |
12.03 |
| 2026-02-14 12:00 |
05:04:25.39 |
+06:32:03.9 |
HIP 23542 |
11.75 |
| 2026-02-15 00:00 |
05:04:24.51 |
+06:32:13.7 |
HIP 23542 |
11.48 |
| 2026-02-15 12:00 |
05:04:23.65 |
+06:32:23.5 |
HIP 23542 |
11.21 |
| 2026-02-16 00:00 |
05:04:22.81 |
+06:32:33.4 |
HIP 23542 |
10.95 |
| 2026-02-16 12:00 |
05:04:21.99 |
+06:32:43.3 |
HIP 23542 |
10.69 |
| 2026-02-17 00:00 |
05:04:21.19 |
+06:32:53.3 |
HIP 23542 |
10.43 |
| 2026-02-17 12:00 |
05:04:20.42 |
+06:33:03.4 |
HIP 23542 |
10.18 |
| 2026-02-18 00:00 |
05:04:19.67 |
+06:33:13.4 |
HIP 23542 |
9.93 |
| 2026-02-18 12:00 |
05:04:18.93 |
+06:33:23.6 |
HIP 23542 |
9.69 |
| 2026-02-19 00:00 |
05:04:18.22 |
+06:33:33.8 |
HIP 23542 |
9.45 |
| 2026-02-19 12:00 |
05:04:17.53 |
+06:33:44.1 |
HIP 23542 |
9.21 |
| 2026-02-20 00:00 |
05:04:16.87 |
+06:33:54.4 |
HIP 23542 |
8.98 |
| 2026-02-20 12:00 |
05:04:16.22 |
+06:34:04.7 |
HIP 23542 |
8.76 |
| 2026-02-21 00:00 |
05:04:15.60 |
+06:34:15.1 |
HIP 23542 |
8.54 |
| 2026-02-21 12:00 |
05:04:14.99 |
+06:34:25.6 |
HIP 23542 |
8.32 |
| 2026-02-22 00:00 |
05:04:14.41 |
+06:34:36.1 |
HIP 23542 |
8.11 |
| 2026-02-22 12:00 |
05:04:13.85 |
+06:34:46.7 |
HIP 23542 |
7.91 |
| 2026-02-23 00:00 |
05:04:13.32 |
+06:34:57.3 |
HIP 23542 |
7.71 |
| 2026-02-23 12:00 |
05:04:12.80 |
+06:35:07.9 |
HIP 23542 |
7.51 |
| 2026-02-24 00:00 |
05:04:12.31 |
+06:35:18.6 |
HIP 23542 |
7.33 |