| Parameter |
Value |
| Designation |
C/2008 E3 (Garradd) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-08-02T05:22:47.424000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:17Z |
| Obs used |
109 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2008-08-09.0000000 |
| e |
0.99849003 |
| q (au) |
5.531015 |
| a (au) |
3662.996730 |
| i (deg) |
105.076501 |
| Ω (om, deg) |
105.674911 |
| ω (w, deg) |
218.094534 |
| M (ma, deg) |
0.000030 |
Magnitude
Scatter + Global Linear
$$
M_a = (2.326 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
2.326 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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) |
| 2026-06-01 00:00 |
07:09:43.29 |
+13:24:05.0 |
HIP 34557 |
15.40 |
| 2026-06-01 12:00 |
07:09:46.05 |
+13:24:09.9 |
HIP 34591 |
15.43 |
| 2026-06-02 00:00 |
07:09:48.82 |
+13:24:14.7 |
HIP 34591 |
15.44 |
| 2026-06-02 12:00 |
07:09:51.61 |
+13:24:19.4 |
HIP 34591 |
15.48 |
| 2026-06-03 00:00 |
07:09:54.41 |
+13:24:24.0 |
HIP 34591 |
15.55 |
| 2026-06-03 12:00 |
07:09:57.23 |
+13:24:28.5 |
HIP 34591 |
15.64 |
| 2026-06-04 00:00 |
07:10:00.06 |
+13:24:32.9 |
HIP 34591 |
15.76 |
| 2026-06-04 12:00 |
07:10:02.91 |
+13:24:37.3 |
HIP 34591 |
15.92 |
| 2026-06-05 00:00 |
07:10:05.77 |
+13:24:41.6 |
HIP 34591 |
16.10 |
| 2026-06-05 12:00 |
07:10:08.65 |
+13:24:45.7 |
HIP 34591 |
16.30 |
| 2026-06-06 00:00 |
07:10:11.54 |
+13:24:49.8 |
HIP 34591 |
16.54 |
| 2026-06-06 12:00 |
07:10:14.45 |
+13:24:53.8 |
HIP 34591 |
16.80 |
| 2026-06-07 00:00 |
07:10:17.37 |
+13:24:57.7 |
HIP 34591 |
17.09 |
| 2026-06-07 12:00 |
07:10:20.31 |
+13:25:01.5 |
HIP 34591 |
17.40 |
| 2026-06-08 00:00 |
07:10:23.25 |
+13:25:05.3 |
HIP 34591 |
17.73 |
| 2026-06-08 12:00 |
07:10:26.21 |
+13:25:08.9 |
HIP 34591 |
18.09 |
| 2026-06-09 00:00 |
07:10:29.19 |
+13:25:12.5 |
HIP 34591 |
18.47 |
| 2026-06-09 12:00 |
07:10:32.18 |
+13:25:16.0 |
HIP 34591 |
18.86 |
| 2026-06-10 00:00 |
07:10:35.18 |
+13:25:19.4 |
HIP 34591 |
19.28 |
| 2026-06-10 12:00 |
07:10:38.19 |
+13:25:22.7 |
HIP 34591 |
19.72 |
| 2026-06-11 00:00 |
07:10:41.22 |
+13:25:25.9 |
HIP 34591 |
20.18 |
| 2026-06-11 12:00 |
07:10:44.25 |
+13:25:29.0 |
HIP 34591 |
20.65 |
| 2026-06-12 00:00 |
07:10:47.30 |
+13:25:32.0 |
HIP 34591 |
21.14 |
| 2026-06-12 12:00 |
07:10:50.36 |
+13:25:35.0 |
HIP 34591 |
21.64 |
| 2026-06-13 00:00 |
07:10:53.44 |
+13:25:37.9 |
HIP 34591 |
22.16 |
| 2026-06-13 12:00 |
07:10:56.52 |
+13:25:40.7 |
HIP 34591 |
22.69 |
| 2026-06-14 00:00 |
07:10:59.62 |
+13:25:43.3 |
HIP 34591 |
23.23 |
| 2026-06-14 12:00 |
07:11:02.72 |
+13:25:46.0 |
HIP 34591 |
23.79 |
| 2026-06-15 00:00 |
07:11:05.84 |
+13:25:48.5 |
HIP 34591 |
24.36 |
| 2026-06-15 12:00 |
07:11:08.97 |
+13:25:50.9 |
HIP 34591 |
24.94 |
| 2026-06-16 00:00 |
07:11:12.11 |
+13:25:53.3 |
HIP 34591 |
25.53 |
| 2026-06-16 12:00 |
07:11:15.25 |
+13:25:55.5 |
HIP 34591 |
26.13 |
| 2026-06-17 00:00 |
07:11:18.41 |
+13:25:57.7 |
HIP 34591 |
26.74 |
| 2026-06-17 12:00 |
07:11:21.58 |
+13:25:59.8 |
HIP 34591 |
27.36 |
| 2026-06-18 00:00 |
07:11:24.75 |
+13:26:01.8 |
HIP 34591 |
27.98 |
| 2026-06-18 12:00 |
07:11:27.94 |
+13:26:03.8 |
HIP 34591 |
28.62 |
| 2026-06-19 00:00 |
07:11:31.13 |
+13:26:05.6 |
HIP 34591 |
29.26 |
| 2026-06-19 12:00 |
07:11:34.33 |
+13:26:07.4 |
HIP 34591 |
29.91 |
| 2026-06-20 00:00 |
07:11:37.55 |
+13:26:09.1 |
HIP 34591 |
30.57 |
| 2026-06-20 12:00 |
07:11:40.76 |
+13:26:10.7 |
HIP 34591 |
31.23 |
| 2026-06-21 00:00 |
07:11:43.99 |
+13:26:12.2 |
HIP 34913 |
31.16 |
| 2026-06-21 12:00 |
07:11:47.22 |
+13:26:13.6 |
HIP 34913 |
30.54 |
| 2026-06-22 00:00 |
07:11:50.47 |
+13:26:15.0 |
HIP 34913 |
29.92 |