| 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) |
| 2026-03-26 00:00 |
07:07:05.61 |
+13:00:37.6 |
HIP 34328 |
23.63 |
| 2026-03-26 12:00 |
07:07:04.88 |
+13:00:52.7 |
HIP 34328 |
23.36 |
| 2026-03-27 00:00 |
07:07:04.18 |
+13:01:07.8 |
HIP 34328 |
23.10 |
| 2026-03-27 12:00 |
07:07:03.51 |
+13:01:22.8 |
HIP 34328 |
22.84 |
| 2026-03-28 00:00 |
07:07:02.87 |
+13:01:37.8 |
HIP 34328 |
22.58 |
| 2026-03-28 12:00 |
07:07:02.26 |
+13:01:52.7 |
HIP 34328 |
22.32 |
| 2026-03-29 00:00 |
07:07:01.69 |
+13:02:07.6 |
HIP 34328 |
22.07 |
| 2026-03-29 12:00 |
07:07:01.14 |
+13:02:22.4 |
HIP 34328 |
21.82 |
| 2026-03-30 00:00 |
07:07:00.63 |
+13:02:37.2 |
HIP 34328 |
21.56 |
| 2026-03-30 12:00 |
07:07:00.15 |
+13:02:51.9 |
HIP 34328 |
21.32 |
| 2026-03-31 00:00 |
07:06:59.70 |
+13:03:06.6 |
HIP 34328 |
21.07 |
| 2026-03-31 12:00 |
07:06:59.28 |
+13:03:21.2 |
HIP 34328 |
20.82 |
| 2026-04-01 00:00 |
07:06:58.89 |
+13:03:35.8 |
HIP 34328 |
20.58 |
| 2026-04-01 12:00 |
07:06:58.53 |
+13:03:50.3 |
HIP 34328 |
20.34 |
| 2026-04-02 00:00 |
07:06:58.21 |
+13:04:04.8 |
HIP 34328 |
20.09 |
| 2026-04-02 12:00 |
07:06:57.91 |
+13:04:19.2 |
HIP 34328 |
19.85 |
| 2026-04-03 00:00 |
07:06:57.65 |
+13:04:33.5 |
HIP 34328 |
19.61 |
| 2026-04-03 12:00 |
07:06:57.41 |
+13:04:47.8 |
HIP 34328 |
19.38 |
| 2026-04-04 00:00 |
07:06:57.21 |
+13:05:02.0 |
HIP 34328 |
19.14 |
| 2026-04-04 12:00 |
07:06:57.04 |
+13:05:16.2 |
HIP 34328 |
18.90 |
| 2026-04-05 00:00 |
07:06:56.90 |
+13:05:30.3 |
HIP 34328 |
18.67 |
| 2026-04-05 12:00 |
07:06:56.80 |
+13:05:44.4 |
HIP 34328 |
18.43 |
| 2026-04-06 00:00 |
07:06:56.72 |
+13:05:58.4 |
HIP 34328 |
18.20 |
| 2026-04-06 12:00 |
07:06:56.67 |
+13:06:12.3 |
HIP 34328 |
17.97 |
| 2026-04-07 00:00 |
07:06:56.66 |
+13:06:26.2 |
HIP 34328 |
17.74 |
| 2026-04-07 12:00 |
07:06:56.67 |
+13:06:40.0 |
HIP 34328 |
17.51 |
| 2026-04-08 00:00 |
07:06:56.72 |
+13:06:53.7 |
HIP 34328 |
17.28 |
| 2026-04-08 12:00 |
07:06:56.80 |
+13:07:07.4 |
HIP 34328 |
17.05 |
| 2026-04-09 00:00 |
07:06:56.90 |
+13:07:21.0 |
HIP 34328 |
16.82 |
| 2026-04-09 12:00 |
07:06:57.04 |
+13:07:34.6 |
HIP 34328 |
16.60 |
| 2026-04-10 00:00 |
07:06:57.21 |
+13:07:48.1 |
HIP 34328 |
16.37 |
| 2026-04-10 12:00 |
07:06:57.41 |
+13:08:01.5 |
HIP 34328 |
16.15 |
| 2026-04-11 00:00 |
07:06:57.64 |
+13:08:14.9 |
HIP 34328 |
15.92 |
| 2026-04-11 12:00 |
07:06:57.91 |
+13:08:28.2 |
HIP 34328 |
15.70 |
| 2026-04-12 00:00 |
07:06:58.20 |
+13:08:41.4 |
HIP 34328 |
15.48 |
| 2026-04-12 12:00 |
07:06:58.52 |
+13:08:54.6 |
HIP 34328 |
15.26 |
| 2026-04-13 00:00 |
07:06:58.87 |
+13:09:07.7 |
HIP 34328 |
15.05 |
| 2026-04-13 12:00 |
07:06:59.26 |
+13:09:20.7 |
HIP 34328 |
14.83 |
| 2026-04-14 00:00 |
07:06:59.67 |
+13:09:33.7 |
HIP 34328 |
14.62 |
| 2026-04-14 12:00 |
07:07:00.12 |
+13:09:46.6 |
HIP 34328 |
14.41 |
| 2026-04-15 00:00 |
07:07:00.59 |
+13:09:59.4 |
HIP 34328 |
14.20 |
| 2026-04-15 12:00 |
07:07:01.10 |
+13:10:12.2 |
HIP 34328 |
14.00 |
| 2026-04-16 00:00 |
07:07:01.63 |
+13:10:24.8 |
HIP 34328 |
13.79 |