| Parameter |
Value |
| Designation |
C/2008 J5 (Garradd) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-04-01T01:47:02.302080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:19Z |
| Obs used |
128 |
| NEO |
- |
| M1 |
10.600 |
| K1 |
17.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2008-06-25.0000000 |
| e |
0.97288948 |
| q (au) |
1.963842 |
| a (au) |
72.438378 |
| i (deg) |
93.270724 |
| Ω (om, deg) |
287.075696 |
| ω (w, deg) |
313.376402 |
| M (ma, deg) |
0.135766 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.954 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.954 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.798 |
| k |
0.998 |
| 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 |
13:36:47.77 |
+79:34:50.5 |
HIP 66373 |
10.53 |
| 2026-07-29 12:00 |
13:36:49.81 |
+79:34:02.3 |
HIP 66373 |
9.75 |
| 2026-07-30 00:00 |
13:36:51.99 |
+79:33:14.1 |
HIP 66373 |
8.96 |
| 2026-07-30 12:00 |
13:36:54.30 |
+79:32:26.0 |
HIP 66373 |
8.19 |
| 2026-07-31 00:00 |
13:36:56.75 |
+79:31:38.0 |
HIP 66373 |
7.43 |
| 2026-07-31 12:00 |
13:36:59.33 |
+79:30:50.1 |
HIP 66373 |
6.68 |
| 2026-08-01 00:00 |
13:37:02.04 |
+79:30:02.3 |
HIP 66373 |
5.94 |
| 2026-08-01 12:00 |
13:37:04.88 |
+79:29:14.5 |
HIP 66373 |
5.24 |
| 2026-08-02 00:00 |
13:37:07.86 |
+79:28:26.8 |
HIP 66373 |
4.57 |
| 2026-08-02 12:00 |
13:37:10.96 |
+79:27:39.3 |
HIP 66373 |
3.95 |
| 2026-08-03 00:00 |
13:37:14.20 |
+79:26:51.8 |
HIP 66373 |
3.43 |
| 2026-08-03 12:00 |
13:37:17.57 |
+79:26:04.4 |
HIP 66373 |
3.03 |
| 2026-08-04 00:00 |
13:37:21.06 |
+79:25:17.2 |
HIP 66373 |
2.82 |
| 2026-08-04 12:00 |
13:37:24.68 |
+79:24:30.0 |
HIP 66373 |
2.84 |
| 2026-08-05 00:00 |
13:37:28.43 |
+79:23:43.0 |
HIP 66373 |
3.08 |
| 2026-08-05 12:00 |
13:37:32.31 |
+79:22:56.0 |
HIP 66393 |
2.74 |
| 2026-08-06 00:00 |
13:37:36.31 |
+79:22:09.2 |
HIP 66393 |
2.51 |
| 2026-08-06 12:00 |
13:37:40.44 |
+79:21:22.5 |
HIP 66393 |
2.53 |
| 2026-08-07 00:00 |
13:37:44.69 |
+79:20:35.9 |
HIP 66393 |
2.79 |
| 2026-08-07 12:00 |
13:37:49.07 |
+79:19:49.5 |
HIP 66393 |
3.24 |
| 2026-08-08 00:00 |
13:37:53.57 |
+79:19:03.1 |
HIP 66393 |
3.81 |
| 2026-08-08 12:00 |
13:37:58.19 |
+79:18:16.9 |
HIP 66393 |
4.46 |
| 2026-08-09 00:00 |
13:38:02.94 |
+79:17:30.8 |
HIP 66393 |
5.15 |
| 2026-08-09 12:00 |
13:38:07.81 |
+79:16:44.9 |
HIP 66393 |
5.87 |
| 2026-08-10 00:00 |
13:38:12.80 |
+79:15:59.1 |
HIP 66393 |
6.61 |
| 2026-08-10 12:00 |
13:38:17.91 |
+79:15:13.4 |
HIP 66393 |
7.37 |
| 2026-08-11 00:00 |
13:38:23.13 |
+79:14:27.9 |
HIP 66393 |
8.13 |
| 2026-08-11 12:00 |
13:38:28.48 |
+79:13:42.6 |
HIP 66393 |
8.90 |
| 2026-08-12 00:00 |
13:38:33.95 |
+79:12:57.4 |
HIP 66393 |
9.68 |
| 2026-08-12 12:00 |
13:38:39.53 |
+79:12:12.3 |
HIP 66393 |
10.46 |
| 2026-08-13 00:00 |
13:38:45.23 |
+79:11:27.4 |
HIP 66393 |
11.24 |
| 2026-08-13 12:00 |
13:38:51.04 |
+79:10:42.7 |
HIP 66393 |
12.02 |
| 2026-08-14 00:00 |
13:38:56.97 |
+79:09:58.1 |
HIP 66393 |
12.81 |
| 2026-08-14 12:00 |
13:39:03.01 |
+79:09:13.7 |
HIP 66393 |
13.60 |
| 2026-08-15 00:00 |
13:39:09.17 |
+79:08:29.4 |
HIP 66393 |
14.38 |
| 2026-08-15 12:00 |
13:39:15.43 |
+79:07:45.4 |
HIP 66393 |
15.17 |
| 2026-08-16 00:00 |
13:39:21.81 |
+79:07:01.5 |
HIP 66393 |
15.96 |
| 2026-08-16 12:00 |
13:39:28.30 |
+79:06:17.8 |
HIP 66393 |
16.75 |
| 2026-08-17 00:00 |
13:39:34.90 |
+79:05:34.3 |
HIP 66393 |
17.54 |
| 2026-08-17 12:00 |
13:39:41.61 |
+79:04:50.9 |
HIP 66393 |
18.32 |
| 2026-08-18 00:00 |
13:39:48.43 |
+79:04:07.8 |
HIP 66393 |
19.11 |
| 2026-08-18 12:00 |
13:39:55.35 |
+79:03:24.8 |
HIP 66393 |
19.90 |
| 2026-08-19 00:00 |
13:40:02.38 |
+79:02:42.0 |
HIP 66393 |
20.69 |