| 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) |
| 2026-06-01 00:00 |
17:19:43.94 |
+50:20:38.6 |
HIP 84892 |
20.04 |
| 2026-06-01 12:00 |
17:19:38.82 |
+50:20:48.8 |
HIP 84892 |
20.67 |
| 2026-06-02 00:00 |
17:19:33.70 |
+50:20:58.6 |
HIP 84892 |
21.32 |
| 2026-06-02 12:00 |
17:19:28.57 |
+50:21:08.0 |
HIP 84892 |
21.97 |
| 2026-06-03 00:00 |
17:19:23.43 |
+50:21:16.9 |
HIP 84892 |
22.63 |
| 2026-06-03 12:00 |
17:19:18.28 |
+50:21:25.3 |
HIP 84892 |
23.30 |
| 2026-06-04 00:00 |
17:19:13.13 |
+50:21:33.3 |
HIP 84892 |
23.97 |
| 2026-06-04 12:00 |
17:19:07.97 |
+50:21:40.9 |
HIP 84892 |
24.65 |
| 2026-06-05 00:00 |
17:19:02.80 |
+50:21:48.0 |
HIP 84892 |
25.34 |
| 2026-06-05 12:00 |
17:18:57.63 |
+50:21:54.7 |
HIP 84892 |
26.03 |
| 2026-06-06 00:00 |
17:18:52.45 |
+50:22:00.9 |
HIP 84520 |
25.61 |
| 2026-06-06 12:00 |
17:18:47.27 |
+50:22:06.6 |
HIP 84520 |
24.87 |
| 2026-06-07 00:00 |
17:18:42.09 |
+50:22:12.0 |
HIP 84520 |
24.15 |
| 2026-06-07 12:00 |
17:18:36.90 |
+50:22:16.8 |
HIP 84520 |
23.44 |
| 2026-06-08 00:00 |
17:18:31.71 |
+50:22:21.3 |
HIP 84520 |
22.74 |
| 2026-06-08 12:00 |
17:18:26.52 |
+50:22:25.3 |
HIP 84520 |
22.05 |
| 2026-06-09 00:00 |
17:18:21.32 |
+50:22:28.8 |
HIP 84520 |
21.38 |
| 2026-06-09 12:00 |
17:18:16.12 |
+50:22:31.9 |
HIP 84520 |
20.72 |
| 2026-06-10 00:00 |
17:18:10.92 |
+50:22:34.5 |
HIP 84520 |
20.08 |
| 2026-06-10 12:00 |
17:18:05.72 |
+50:22:36.7 |
HIP 84520 |
19.47 |
| 2026-06-11 00:00 |
17:18:00.52 |
+50:22:38.4 |
HIP 84520 |
18.87 |
| 2026-06-11 12:00 |
17:17:55.32 |
+50:22:39.7 |
HIP 84520 |
18.30 |
| 2026-06-12 00:00 |
17:17:50.12 |
+50:22:40.5 |
HIP 84520 |
17.75 |
| 2026-06-12 12:00 |
17:17:44.92 |
+50:22:40.8 |
HIP 84520 |
17.23 |
| 2026-06-13 00:00 |
17:17:39.72 |
+50:22:40.8 |
HIP 84520 |
16.74 |
| 2026-06-13 12:00 |
17:17:34.52 |
+50:22:40.2 |
HIP 84520 |
16.29 |
| 2026-06-14 00:00 |
17:17:29.33 |
+50:22:39.2 |
HIP 84520 |
15.87 |
| 2026-06-14 12:00 |
17:17:24.14 |
+50:22:37.8 |
HIP 84520 |
15.49 |
| 2026-06-15 00:00 |
17:17:18.95 |
+50:22:35.9 |
HIP 84520 |
15.16 |
| 2026-06-15 12:00 |
17:17:13.76 |
+50:22:33.5 |
HIP 84520 |
14.87 |
| 2026-06-16 00:00 |
17:17:08.58 |
+50:22:30.7 |
HIP 84520 |
14.63 |
| 2026-06-16 12:00 |
17:17:03.41 |
+50:22:27.5 |
HIP 84520 |
14.44 |
| 2026-06-17 00:00 |
17:16:58.24 |
+50:22:23.8 |
HIP 84520 |
14.30 |
| 2026-06-17 12:00 |
17:16:53.07 |
+50:22:19.6 |
HIP 84520 |
14.22 |
| 2026-06-18 00:00 |
17:16:47.91 |
+50:22:15.0 |
HIP 84520 |
14.19 |
| 2026-06-18 12:00 |
17:16:42.76 |
+50:22:10.0 |
HIP 84520 |
14.22 |
| 2026-06-19 00:00 |
17:16:37.61 |
+50:22:04.5 |
HIP 84520 |
14.30 |
| 2026-06-19 12:00 |
17:16:32.48 |
+50:21:58.5 |
HIP 84520 |
14.44 |
| 2026-06-20 00:00 |
17:16:27.35 |
+50:21:52.1 |
HIP 84520 |
14.62 |
| 2026-06-20 12:00 |
17:16:22.23 |
+50:21:45.3 |
HIP 84520 |
14.86 |
| 2026-06-21 00:00 |
17:16:17.11 |
+50:21:38.0 |
HIP 84520 |
15.15 |
| 2026-06-21 12:00 |
17:16:12.01 |
+50:21:30.3 |
HIP 84520 |
15.48 |
| 2026-06-22 00:00 |
17:16:06.92 |
+50:21:22.1 |
HIP 84520 |
15.86 |