| Parameter |
Value |
| Designation |
C/2003 A2 (Gleason) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2003-11-05T00:23:36.450240Z |
| Orbit solution date (soln_date, UTC) |
2025-07-31T12:12:22Z |
| Obs used |
165 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
7.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2003-08-08.0000000 |
| e |
1.00694108 |
| q (au) |
11.427006 |
| a (au) |
-1646.285863 |
| i (deg) |
8.061536 |
| Ω (om, deg) |
154.544669 |
| ω (w, deg) |
346.638010 |
| M (ma, deg) |
-0.001313 |
Magnitude
Scatter + Global Linear
$$
M_a = (-2.179 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
-2.179 |
| n |
6.000 |
| gf |
0.898 |
| gb |
-0.974 |
| k |
1.000 |
| δ90 |
4.460 |
| 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) |
| 2026-03-26 00:00 |
16:58:10.98 |
-14:34:53.2 |
HIP 83045 |
12.54 |
| 2026-03-26 12:00 |
16:58:10.33 |
-14:34:45.8 |
HIP 83045 |
12.42 |
| 2026-03-27 00:00 |
16:58:09.65 |
-14:34:38.4 |
HIP 83045 |
12.29 |
| 2026-03-27 12:00 |
16:58:08.94 |
-14:34:31.0 |
HIP 83045 |
12.17 |
| 2026-03-28 00:00 |
16:58:08.21 |
-14:34:23.6 |
HIP 83045 |
12.05 |
| 2026-03-28 12:00 |
16:58:07.45 |
-14:34:16.1 |
HIP 83045 |
11.93 |
| 2026-03-29 00:00 |
16:58:06.67 |
-14:34:08.7 |
HIP 83045 |
11.82 |
| 2026-03-29 12:00 |
16:58:05.85 |
-14:34:01.2 |
HIP 83045 |
11.71 |
| 2026-03-30 00:00 |
16:58:05.01 |
-14:33:53.7 |
HIP 83045 |
11.60 |
| 2026-03-30 12:00 |
16:58:04.14 |
-14:33:46.1 |
HIP 83045 |
11.49 |
| 2026-03-31 00:00 |
16:58:03.25 |
-14:33:38.6 |
HIP 83045 |
11.40 |
| 2026-03-31 12:00 |
16:58:02.33 |
-14:33:31.0 |
HIP 83045 |
11.30 |
| 2026-04-01 00:00 |
16:58:01.38 |
-14:33:23.4 |
HIP 83045 |
11.22 |
| 2026-04-01 12:00 |
16:58:00.41 |
-14:33:15.8 |
HIP 83045 |
11.14 |
| 2026-04-02 00:00 |
16:57:59.41 |
-14:33:08.2 |
HIP 83045 |
11.06 |
| 2026-04-02 12:00 |
16:57:58.39 |
-14:33:00.5 |
HIP 83045 |
11.00 |
| 2026-04-03 00:00 |
16:57:57.33 |
-14:32:52.9 |
HIP 83045 |
10.94 |
| 2026-04-03 12:00 |
16:57:56.26 |
-14:32:45.2 |
HIP 83045 |
10.89 |
| 2026-04-04 00:00 |
16:57:55.15 |
-14:32:37.5 |
HIP 83045 |
10.85 |
| 2026-04-04 12:00 |
16:57:54.02 |
-14:32:29.8 |
HIP 83045 |
10.82 |
| 2026-04-05 00:00 |
16:57:52.87 |
-14:32:22.1 |
HIP 83045 |
10.80 |
| 2026-04-05 12:00 |
16:57:51.69 |
-14:32:14.4 |
HIP 83045 |
10.79 |
| 2026-04-06 00:00 |
16:57:50.48 |
-14:32:06.7 |
HIP 83045 |
10.80 |
| 2026-04-06 12:00 |
16:57:49.25 |
-14:31:58.9 |
HIP 83045 |
10.81 |
| 2026-04-07 00:00 |
16:57:48.00 |
-14:31:51.1 |
HIP 83045 |
10.84 |
| 2026-04-07 12:00 |
16:57:46.72 |
-14:31:43.4 |
HIP 83045 |
10.88 |
| 2026-04-08 00:00 |
16:57:45.41 |
-14:31:35.6 |
HIP 83045 |
10.93 |
| 2026-04-08 12:00 |
16:57:44.08 |
-14:31:27.8 |
HIP 83045 |
11.00 |
| 2026-04-09 00:00 |
16:57:42.72 |
-14:31:20.0 |
HIP 83045 |
11.08 |
| 2026-04-09 12:00 |
16:57:41.34 |
-14:31:12.2 |
HIP 83045 |
11.18 |
| 2026-04-10 00:00 |
16:57:39.94 |
-14:31:04.4 |
HIP 83045 |
11.29 |
| 2026-04-10 12:00 |
16:57:38.51 |
-14:30:56.6 |
HIP 83045 |
11.41 |
| 2026-04-11 00:00 |
16:57:37.05 |
-14:30:48.7 |
HIP 83045 |
11.55 |
| 2026-04-11 12:00 |
16:57:35.58 |
-14:30:40.9 |
HIP 83045 |
11.70 |
| 2026-04-12 00:00 |
16:57:34.07 |
-14:30:33.1 |
HIP 83045 |
11.87 |
| 2026-04-12 12:00 |
16:57:32.55 |
-14:30:25.2 |
HIP 83045 |
12.05 |
| 2026-04-13 00:00 |
16:57:31.00 |
-14:30:17.4 |
HIP 83045 |
12.25 |
| 2026-04-13 12:00 |
16:57:29.43 |
-14:30:09.5 |
HIP 83045 |
12.46 |
| 2026-04-14 00:00 |
16:57:27.83 |
-14:30:01.7 |
HIP 83045 |
12.68 |
| 2026-04-14 12:00 |
16:57:26.21 |
-14:29:53.8 |
HIP 83045 |
12.92 |
| 2026-04-15 00:00 |
16:57:24.57 |
-14:29:46.0 |
HIP 83045 |
13.17 |
| 2026-04-15 12:00 |
16:57:22.90 |
-14:29:38.1 |
HIP 83045 |
13.43 |
| 2026-04-16 00:00 |
16:57:21.22 |
-14:29:30.3 |
HIP 83045 |
13.71 |