| 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) |
| 2026-07-29 00:00 |
11:41:35.72 |
+22:18:59.4 |
HIP 57082 |
9.31 |
| 2026-07-29 12:00 |
11:41:46.17 |
+22:17:14.6 |
HIP 57082 |
6.36 |
| 2026-07-30 00:00 |
11:41:56.68 |
+22:15:29.8 |
HIP 57082 |
3.45 |
| 2026-07-30 12:00 |
11:42:07.24 |
+22:13:45.1 |
HIP 57082 |
1.17 |
| 2026-07-31 00:00 |
11:42:17.87 |
+22:12:00.4 |
HIP 57082 |
2.99 |
| 2026-07-31 12:00 |
11:42:28.55 |
+22:10:15.7 |
HIP 57082 |
5.91 |
| 2026-08-01 00:00 |
11:42:39.29 |
+22:08:31.0 |
HIP 57082 |
8.91 |
| 2026-08-01 12:00 |
11:42:50.08 |
+22:06:46.3 |
HIP 57082 |
11.94 |
| 2026-08-02 00:00 |
11:43:00.93 |
+22:05:01.7 |
HIP 57082 |
14.99 |
| 2026-08-02 12:00 |
11:43:11.83 |
+22:03:17.1 |
HIP 57082 |
18.05 |
| 2026-08-03 00:00 |
11:43:22.79 |
+22:01:32.5 |
HIP 57082 |
21.13 |
| 2026-08-03 12:00 |
11:43:33.80 |
+21:59:48.0 |
HIP 57082 |
24.21 |
| 2026-08-04 00:00 |
11:43:44.86 |
+21:58:03.6 |
HIP 57262 |
27.20 |
| 2026-08-04 12:00 |
11:43:55.98 |
+21:56:19.1 |
HIP 57262 |
27.85 |
| 2026-08-05 00:00 |
11:44:07.15 |
+21:54:34.8 |
HIP 57318 |
26.08 |
| 2026-08-05 12:00 |
11:44:18.38 |
+21:52:50.4 |
HIP 57318 |
23.23 |
| 2026-08-06 00:00 |
11:44:29.65 |
+21:51:06.2 |
HIP 57318 |
20.46 |
| 2026-08-06 12:00 |
11:44:40.98 |
+21:49:22.0 |
HIP 57318 |
17.81 |
| 2026-08-07 00:00 |
11:44:52.35 |
+21:47:37.9 |
HIP 57318 |
15.35 |
| 2026-08-07 12:00 |
11:45:03.78 |
+21:45:53.8 |
HIP 57318 |
13.18 |
| 2026-08-08 00:00 |
11:45:15.25 |
+21:44:09.9 |
HIP 57318 |
11.50 |
| 2026-08-08 12:00 |
11:45:26.78 |
+21:42:26.0 |
HIP 57318 |
10.54 |
| 2026-08-09 00:00 |
11:45:38.35 |
+21:40:42.2 |
HIP 57318 |
10.51 |
| 2026-08-09 12:00 |
11:45:49.97 |
+21:38:58.4 |
HIP 57318 |
11.43 |
| 2026-08-10 00:00 |
11:46:01.64 |
+21:37:14.8 |
HIP 57318 |
13.10 |
| 2026-08-10 12:00 |
11:46:13.36 |
+21:35:31.3 |
HIP 57318 |
15.28 |
| 2026-08-11 00:00 |
11:46:25.12 |
+21:33:47.8 |
HIP 57318 |
17.80 |
| 2026-08-11 12:00 |
11:46:36.93 |
+21:32:04.5 |
HIP 57318 |
20.53 |
| 2026-08-12 00:00 |
11:46:48.78 |
+21:30:21.3 |
HIP 57318 |
23.40 |
| 2026-08-12 12:00 |
11:47:00.68 |
+21:28:38.2 |
HIP 57318 |
26.37 |
| 2026-08-13 00:00 |
11:47:12.62 |
+21:26:55.2 |
HIP 57318 |
29.41 |
| 2026-08-13 12:00 |
11:47:24.60 |
+21:25:12.4 |
HIP 57318 |
32.51 |
| 2026-08-14 00:00 |
11:47:36.63 |
+21:23:29.7 |
HIP 57318 |
35.64 |
| 2026-08-14 12:00 |
11:47:48.70 |
+21:21:47.1 |
HIP 57711 |
34.70 |
| 2026-08-15 00:00 |
11:48:00.82 |
+21:20:04.6 |
HIP 57711 |
31.46 |
| 2026-08-15 12:00 |
11:48:12.97 |
+21:18:22.3 |
HIP 57711 |
28.23 |
| 2026-08-16 00:00 |
11:48:25.16 |
+21:16:40.1 |
HIP 57711 |
25.01 |
| 2026-08-16 12:00 |
11:48:37.40 |
+21:14:58.1 |
HIP 57711 |
21.80 |
| 2026-08-17 00:00 |
11:48:49.67 |
+21:13:16.3 |
HIP 57711 |
18.63 |
| 2026-08-17 12:00 |
11:49:01.98 |
+21:11:34.6 |
HIP 57711 |
15.51 |
| 2026-08-18 00:00 |
11:49:14.33 |
+21:09:53.0 |
HIP 57711 |
12.48 |
| 2026-08-18 12:00 |
11:49:26.72 |
+21:08:11.7 |
HIP 57711 |
9.66 |
| 2026-08-19 00:00 |
11:49:39.14 |
+21:06:30.5 |
HIP 57711 |
7.29 |