| 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) |
| 2026-03-26 00:00 |
17:27:16.89 |
+49:02:54.3 |
HIP 85226 |
24.80 |
| 2026-03-26 12:00 |
17:27:16.10 |
+49:03:45.2 |
HIP 85226 |
24.41 |
| 2026-03-27 00:00 |
17:27:15.26 |
+49:04:36.1 |
HIP 85226 |
24.04 |
| 2026-03-27 12:00 |
17:27:14.38 |
+49:05:26.9 |
HIP 85226 |
23.68 |
| 2026-03-28 00:00 |
17:27:13.45 |
+49:06:17.5 |
HIP 85226 |
23.35 |
| 2026-03-28 12:00 |
17:27:12.47 |
+49:07:08.1 |
HIP 85226 |
23.03 |
| 2026-03-29 00:00 |
17:27:11.45 |
+49:07:58.5 |
HIP 85226 |
22.74 |
| 2026-03-29 12:00 |
17:27:10.38 |
+49:08:48.9 |
HIP 85226 |
22.46 |
| 2026-03-30 00:00 |
17:27:09.26 |
+49:09:39.1 |
HIP 85226 |
22.21 |
| 2026-03-30 12:00 |
17:27:08.10 |
+49:10:29.2 |
HIP 85226 |
21.99 |
| 2026-03-31 00:00 |
17:27:06.89 |
+49:11:19.2 |
HIP 85226 |
21.78 |
| 2026-03-31 12:00 |
17:27:05.64 |
+49:12:09.0 |
HIP 85226 |
21.60 |
| 2026-04-01 00:00 |
17:27:04.33 |
+49:12:58.7 |
HIP 85226 |
21.45 |
| 2026-04-01 12:00 |
17:27:02.99 |
+49:13:48.3 |
HIP 85226 |
21.32 |
| 2026-04-02 00:00 |
17:27:01.59 |
+49:14:37.8 |
HIP 85226 |
21.22 |
| 2026-04-02 12:00 |
17:27:00.15 |
+49:15:27.1 |
HIP 85226 |
21.14 |
| 2026-04-03 00:00 |
17:26:58.67 |
+49:16:16.2 |
HIP 85226 |
21.09 |
| 2026-04-03 12:00 |
17:26:57.14 |
+49:17:05.3 |
HIP 85226 |
21.07 |
| 2026-04-04 00:00 |
17:26:55.56 |
+49:17:54.1 |
HIP 85226 |
21.08 |
| 2026-04-04 12:00 |
17:26:53.94 |
+49:18:42.8 |
HIP 85226 |
21.11 |
| 2026-04-05 00:00 |
17:26:52.27 |
+49:19:31.4 |
HIP 85226 |
21.16 |
| 2026-04-05 12:00 |
17:26:50.56 |
+49:20:19.8 |
HIP 85226 |
21.25 |
| 2026-04-06 00:00 |
17:26:48.80 |
+49:21:08.0 |
HIP 85226 |
21.36 |
| 2026-04-06 12:00 |
17:26:47.00 |
+49:21:56.0 |
HIP 85226 |
21.50 |
| 2026-04-07 00:00 |
17:26:45.15 |
+49:22:43.9 |
HIP 85226 |
21.66 |
| 2026-04-07 12:00 |
17:26:43.26 |
+49:23:31.6 |
HIP 85226 |
21.84 |
| 2026-04-08 00:00 |
17:26:41.32 |
+49:24:19.1 |
HIP 85430 |
21.67 |
| 2026-04-08 12:00 |
17:26:39.34 |
+49:25:06.5 |
HIP 85430 |
21.05 |
| 2026-04-09 00:00 |
17:26:37.31 |
+49:25:53.6 |
HIP 85430 |
20.44 |
| 2026-04-09 12:00 |
17:26:35.25 |
+49:26:40.6 |
HIP 85430 |
19.87 |
| 2026-04-10 00:00 |
17:26:33.13 |
+49:27:27.3 |
HIP 85430 |
19.31 |
| 2026-04-10 12:00 |
17:26:30.97 |
+49:28:13.9 |
HIP 85430 |
18.79 |
| 2026-04-11 00:00 |
17:26:28.77 |
+49:29:00.2 |
HIP 85430 |
18.30 |
| 2026-04-11 12:00 |
17:26:26.53 |
+49:29:46.4 |
HIP 85430 |
17.84 |
| 2026-04-12 00:00 |
17:26:24.24 |
+49:30:32.3 |
HIP 85430 |
17.41 |
| 2026-04-12 12:00 |
17:26:21.91 |
+49:31:18.1 |
HIP 85430 |
17.03 |
| 2026-04-13 00:00 |
17:26:19.53 |
+49:32:03.6 |
HIP 85430 |
16.69 |
| 2026-04-13 12:00 |
17:26:17.12 |
+49:32:48.9 |
HIP 85430 |
16.39 |
| 2026-04-14 00:00 |
17:26:14.66 |
+49:33:33.9 |
HIP 85430 |
16.14 |
| 2026-04-14 12:00 |
17:26:12.15 |
+49:34:18.8 |
HIP 85430 |
15.94 |
| 2026-04-15 00:00 |
17:26:09.61 |
+49:35:03.4 |
HIP 85430 |
15.79 |
| 2026-04-15 12:00 |
17:26:07.02 |
+49:35:47.7 |
HIP 85430 |
15.69 |
| 2026-04-16 00:00 |
17:26:04.39 |
+49:36:31.9 |
HIP 85430 |
15.64 |