| Parameter |
Value |
| Designation |
436P/Garradd |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2007-09-27T18:17:01.438080Z |
| Orbit solution date (soln_date, UTC) |
2022-12-08T23:43:50Z |
| Obs used |
113 |
| NEO |
- |
| M1 |
11.300 |
| K1 |
23.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2021-10-24T10:16:59.808000Z |
| Discovery magnitude (MPC) |
19.40 T |
| Discovery observatory (MPC) |
Q62 · iTelescope Observatory, Siding Spring |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2011-04-11.0000000 |
| e |
0.67183664 |
| q (au) |
1.923695 |
| a (au) |
5.862005 |
| i (deg) |
20.206219 |
| Ω (om, deg) |
87.397920 |
| ω (w, deg) |
283.069780 |
| M (ma, deg) |
89.668749 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.835 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.835 |
| 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) |
| 2026-03-26 00:00 |
11:45:38.85 |
+26:01:17.5 |
HIP 57373 |
3.43 |
| 2026-03-26 12:00 |
11:45:26.83 |
+26:02:06.4 |
HIP 57373 |
5.62 |
| 2026-03-27 00:00 |
11:45:14.84 |
+26:02:54.3 |
HIP 57373 |
8.19 |
| 2026-03-27 12:00 |
11:45:02.88 |
+26:03:41.2 |
HIP 57373 |
10.86 |
| 2026-03-28 00:00 |
11:44:50.96 |
+26:04:27.0 |
HIP 57373 |
13.57 |
| 2026-03-28 12:00 |
11:44:39.07 |
+26:05:11.8 |
HIP 57373 |
16.29 |
| 2026-03-29 00:00 |
11:44:27.22 |
+26:05:55.5 |
HIP 57373 |
19.01 |
| 2026-03-29 12:00 |
11:44:15.41 |
+26:06:38.3 |
HIP 57373 |
21.72 |
| 2026-03-30 00:00 |
11:44:03.64 |
+26:07:19.9 |
HIP 57373 |
24.43 |
| 2026-03-30 12:00 |
11:43:51.90 |
+26:08:00.6 |
HIP 57373 |
27.13 |
| 2026-03-31 00:00 |
11:43:40.21 |
+26:08:40.2 |
HIP 57061 |
27.62 |
| 2026-03-31 12:00 |
11:43:28.57 |
+26:09:18.7 |
HIP 57061 |
25.68 |
| 2026-04-01 00:00 |
11:43:16.96 |
+26:09:56.2 |
HIP 57061 |
23.89 |
| 2026-04-01 12:00 |
11:43:05.41 |
+26:10:32.6 |
HIP 57061 |
22.27 |
| 2026-04-02 00:00 |
11:42:53.90 |
+26:11:08.0 |
HIP 57061 |
20.86 |
| 2026-04-02 12:00 |
11:42:42.44 |
+26:11:42.3 |
HIP 57061 |
19.71 |
| 2026-04-03 00:00 |
11:42:31.03 |
+26:12:15.6 |
HIP 57061 |
18.84 |
| 2026-04-03 12:00 |
11:42:19.67 |
+26:12:47.8 |
HIP 57061 |
18.30 |
| 2026-04-04 00:00 |
11:42:08.37 |
+26:13:19.0 |
HIP 57061 |
18.10 |
| 2026-04-04 12:00 |
11:41:57.11 |
+26:13:49.1 |
HIP 57061 |
18.26 |
| 2026-04-05 00:00 |
11:41:45.92 |
+26:14:18.1 |
HIP 57061 |
18.75 |
| 2026-04-05 12:00 |
11:41:34.78 |
+26:14:46.1 |
HIP 56921 |
19.25 |
| 2026-04-06 00:00 |
11:41:23.69 |
+26:15:13.0 |
HIP 56921 |
17.04 |
| 2026-04-06 12:00 |
11:41:12.67 |
+26:15:38.8 |
HIP 56921 |
14.93 |
| 2026-04-07 00:00 |
11:41:01.70 |
+26:16:03.6 |
HIP 56921 |
12.97 |
| 2026-04-07 12:00 |
11:40:50.80 |
+26:16:27.3 |
HIP 56921 |
11.22 |
| 2026-04-08 00:00 |
11:40:39.96 |
+26:16:49.9 |
HIP 56921 |
9.78 |
| 2026-04-08 12:00 |
11:40:29.18 |
+26:17:11.5 |
HIP 56921 |
8.80 |
| 2026-04-09 00:00 |
11:40:18.47 |
+26:17:32.0 |
HIP 56921 |
8.42 |
| 2026-04-09 12:00 |
11:40:07.83 |
+26:17:51.4 |
HIP 56921 |
8.71 |
| 2026-04-10 00:00 |
11:39:57.25 |
+26:18:09.8 |
HIP 56921 |
9.59 |
| 2026-04-10 12:00 |
11:39:46.74 |
+26:18:27.1 |
HIP 56850 |
8.15 |
| 2026-04-11 00:00 |
11:39:36.30 |
+26:18:43.3 |
HIP 56850 |
6.96 |
| 2026-04-11 12:00 |
11:39:25.93 |
+26:18:58.5 |
HIP 56850 |
6.44 |
| 2026-04-12 00:00 |
11:39:15.63 |
+26:19:12.5 |
HIP 56850 |
6.72 |
| 2026-04-12 12:00 |
11:39:05.41 |
+26:19:25.6 |
HIP 56850 |
7.69 |
| 2026-04-13 00:00 |
11:38:55.26 |
+26:19:37.5 |
HIP 56850 |
9.13 |
| 2026-04-13 12:00 |
11:38:45.19 |
+26:19:48.4 |
HIP 56850 |
10.84 |
| 2026-04-14 00:00 |
11:38:35.19 |
+26:19:58.2 |
HIP 56850 |
12.70 |
| 2026-04-14 12:00 |
11:38:25.27 |
+26:20:06.9 |
HIP 56850 |
14.64 |
| 2026-04-15 00:00 |
11:38:15.43 |
+26:20:14.6 |
HIP 56850 |
16.64 |
| 2026-04-15 12:00 |
11:38:05.67 |
+26:20:21.2 |
HIP 56850 |
18.65 |
| 2026-04-16 00:00 |
11:37:55.99 |
+26:20:26.8 |
HIP 56850 |
20.68 |