C/2010 E1 (Garradd)
| Parameter |
Value |
| Designation |
C/2010 E1 (Garradd) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2009-11-07T23:08:12.848640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:41Z |
| Obs used |
143 |
| NEO |
- |
| M1 |
11.900 |
| K1 |
9.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2010-03-31.0000000 |
| e |
0.97588616 |
| q (au) |
2.662197 |
| a (au) |
110.401201 |
| i (deg) |
71.697804 |
| Ω (om, deg) |
169.292426 |
| ω (w, deg) |
296.986669 |
| M (ma, deg) |
0.121531 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.469 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.469 |
| n |
2.000 |
| 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) |
| 2026-02-03 00:00 |
17:24:33.76 |
+47:39:58.3 |
HIP 85343 |
23.76 |
| 2026-02-03 12:00 |
17:24:37.50 |
+47:40:38.5 |
HIP 85343 |
23.72 |
| 2026-02-04 00:00 |
17:24:41.21 |
+47:41:19.1 |
HIP 85343 |
23.71 |
| 2026-02-04 12:00 |
17:24:44.88 |
+47:42:00.0 |
HIP 85343 |
23.75 |
| 2026-02-05 00:00 |
17:24:48.51 |
+47:42:41.1 |
HIP 85343 |
23.83 |
| 2026-02-05 12:00 |
17:24:52.10 |
+47:43:22.5 |
HIP 85343 |
23.96 |
| 2026-02-06 00:00 |
17:24:55.66 |
+47:44:04.1 |
HIP 85343 |
24.13 |
| 2026-02-06 12:00 |
17:24:59.18 |
+47:44:46.0 |
HIP 85343 |
24.33 |
| 2026-02-07 00:00 |
17:25:02.67 |
+47:45:28.2 |
HIP 85343 |
24.58 |
| 2026-02-07 12:00 |
17:25:06.12 |
+47:46:10.7 |
HIP 85343 |
24.87 |
| 2026-02-08 00:00 |
17:25:09.53 |
+47:46:53.4 |
HIP 85343 |
25.19 |
| 2026-02-08 12:00 |
17:25:12.90 |
+47:47:36.3 |
HIP 85343 |
25.55 |
| 2026-02-09 00:00 |
17:25:16.23 |
+47:48:19.6 |
HIP 85104 |
25.85 |
| 2026-02-09 12:00 |
17:25:19.52 |
+47:49:03.0 |
HIP 85104 |
25.67 |
| 2026-02-10 00:00 |
17:25:22.78 |
+47:49:46.7 |
HIP 85104 |
25.51 |
| 2026-02-10 12:00 |
17:25:25.99 |
+47:50:30.7 |
HIP 85104 |
25.38 |
| 2026-02-11 00:00 |
17:25:29.17 |
+47:51:14.8 |
HIP 85104 |
25.27 |
| 2026-02-11 12:00 |
17:25:32.31 |
+47:51:59.3 |
HIP 85104 |
25.19 |
| 2026-02-12 00:00 |
17:25:35.41 |
+47:52:43.9 |
HIP 85104 |
25.13 |
| 2026-02-12 12:00 |
17:25:38.46 |
+47:53:28.8 |
HIP 85379 |
24.70 |
| 2026-02-13 00:00 |
17:25:41.48 |
+47:54:13.9 |
HIP 85379 |
23.80 |
| 2026-02-13 12:00 |
17:25:44.46 |
+47:54:59.3 |
HIP 85379 |
22.91 |
| 2026-02-14 00:00 |
17:25:47.39 |
+47:55:44.8 |
HIP 85379 |
22.01 |
| 2026-02-14 12:00 |
17:25:50.29 |
+47:56:30.6 |
HIP 85379 |
21.11 |
| 2026-02-15 00:00 |
17:25:53.14 |
+47:57:16.6 |
HIP 85379 |
20.22 |
| 2026-02-15 12:00 |
17:25:55.95 |
+47:58:02.8 |
HIP 85379 |
19.32 |
| 2026-02-16 00:00 |
17:25:58.72 |
+47:58:49.2 |
HIP 85379 |
18.42 |
| 2026-02-16 12:00 |
17:26:01.45 |
+47:59:35.8 |
HIP 85379 |
17.53 |
| 2026-02-17 00:00 |
17:26:04.14 |
+48:00:22.6 |
HIP 85379 |
16.63 |
| 2026-02-17 12:00 |
17:26:06.78 |
+48:01:09.6 |
HIP 85379 |
15.74 |
| 2026-02-18 00:00 |
17:26:09.38 |
+48:01:56.7 |
HIP 85379 |
14.85 |
| 2026-02-18 12:00 |
17:26:11.94 |
+48:02:44.1 |
HIP 85379 |
13.95 |
| 2026-02-19 00:00 |
17:26:14.45 |
+48:03:31.7 |
HIP 85379 |
13.06 |
| 2026-02-19 12:00 |
17:26:16.93 |
+48:04:19.4 |
HIP 85379 |
12.17 |
| 2026-02-20 00:00 |
17:26:19.35 |
+48:05:07.3 |
HIP 85379 |
11.27 |
| 2026-02-20 12:00 |
17:26:21.74 |
+48:05:55.4 |
HIP 85379 |
10.38 |
| 2026-02-21 00:00 |
17:26:24.08 |
+48:06:43.7 |
HIP 85379 |
9.49 |
| 2026-02-21 12:00 |
17:26:26.38 |
+48:07:32.1 |
HIP 85379 |
8.60 |
| 2026-02-22 00:00 |
17:26:28.63 |
+48:08:20.7 |
HIP 85379 |
7.71 |
| 2026-02-22 12:00 |
17:26:30.84 |
+48:09:09.4 |
HIP 85379 |
6.82 |
| 2026-02-23 00:00 |
17:26:33.01 |
+48:09:58.3 |
HIP 85379 |
5.94 |
| 2026-02-23 12:00 |
17:26:35.13 |
+48:10:47.3 |
HIP 85379 |
5.05 |
| 2026-02-24 00:00 |
17:26:37.21 |
+48:11:36.5 |
HIP 85379 |
4.16 |