| Parameter |
Value |
| Designation |
C/2006 L1 (Garradd) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2006-10-18T00:03:47.067840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:58Z |
| Obs used |
706 |
| NEO |
- |
| M1 |
8.700 |
| K1 |
21.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2006-12-13.0000000 |
| e |
0.99734388 |
| q (au) |
1.462070 |
| a (au) |
550.453473 |
| i (deg) |
143.242586 |
| Ω (om, deg) |
101.760169 |
| ω (w, deg) |
338.409780 |
| M (ma, deg) |
0.004274 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.686 + 5.939\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.686 |
| n |
5.939 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2006-06-04 |
2006-10-17 |
+8.2533 |
-2.681 |
| 2006-10-19 |
2006-12-20 |
+22.8616 |
-6.327 |
| 2006-12-20 |
2007-03-14 |
-11.8664 |
+2.379 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
20:56:10.34 |
+08:39:10.9 |
HIP 103365 |
21.69 |
| 2026-07-29 12:00 |
20:56:07.31 |
+08:39:00.0 |
HIP 103365 |
22.04 |
| 2026-07-30 00:00 |
20:56:04.28 |
+08:38:48.8 |
HIP 103365 |
22.41 |
| 2026-07-30 12:00 |
20:56:01.24 |
+08:38:37.5 |
HIP 103365 |
22.81 |
| 2026-07-31 00:00 |
20:55:58.20 |
+08:38:26.0 |
HIP 103365 |
23.22 |
| 2026-07-31 12:00 |
20:55:55.16 |
+08:38:14.3 |
HIP 103365 |
23.66 |
| 2026-08-01 00:00 |
20:55:52.12 |
+08:38:02.5 |
HIP 103365 |
24.12 |
| 2026-08-01 12:00 |
20:55:49.07 |
+08:37:50.5 |
HIP 103365 |
24.59 |
| 2026-08-02 00:00 |
20:55:46.03 |
+08:37:38.3 |
HIP 103365 |
25.09 |
| 2026-08-02 12:00 |
20:55:42.98 |
+08:37:26.0 |
HIP 103365 |
25.60 |
| 2026-08-03 00:00 |
20:55:39.94 |
+08:37:13.4 |
HIP 103365 |
26.12 |
| 2026-08-03 12:00 |
20:55:36.89 |
+08:37:00.7 |
HIP 103365 |
26.66 |
| 2026-08-04 00:00 |
20:55:33.85 |
+08:36:47.9 |
HIP 103365 |
27.22 |
| 2026-08-04 12:00 |
20:55:30.80 |
+08:36:34.8 |
HIP 103365 |
27.79 |
| 2026-08-05 00:00 |
20:55:27.75 |
+08:36:21.6 |
HIP 103365 |
28.37 |
| 2026-08-05 12:00 |
20:55:24.71 |
+08:36:08.3 |
HIP 103365 |
28.96 |
| 2026-08-06 00:00 |
20:55:21.66 |
+08:35:54.7 |
HIP 103185 |
29.06 |
| 2026-08-06 12:00 |
20:55:18.62 |
+08:35:41.0 |
HIP 103185 |
28.47 |
| 2026-08-07 00:00 |
20:55:15.58 |
+08:35:27.1 |
HIP 103185 |
27.90 |
| 2026-08-07 12:00 |
20:55:12.53 |
+08:35:13.1 |
HIP 103185 |
27.33 |
| 2026-08-08 00:00 |
20:55:09.49 |
+08:34:58.9 |
HIP 103185 |
26.77 |
| 2026-08-08 12:00 |
20:55:06.46 |
+08:34:44.5 |
HIP 103185 |
26.22 |
| 2026-08-09 00:00 |
20:55:03.42 |
+08:34:30.0 |
HIP 103185 |
25.68 |
| 2026-08-09 12:00 |
20:55:00.39 |
+08:34:15.3 |
HIP 103185 |
25.16 |
| 2026-08-10 00:00 |
20:54:57.35 |
+08:34:00.4 |
HIP 103185 |
24.64 |
| 2026-08-10 12:00 |
20:54:54.33 |
+08:33:45.4 |
HIP 103185 |
24.14 |
| 2026-08-11 00:00 |
20:54:51.30 |
+08:33:30.2 |
HIP 103185 |
23.65 |
| 2026-08-11 12:00 |
20:54:48.28 |
+08:33:14.9 |
HIP 103185 |
23.17 |
| 2026-08-12 00:00 |
20:54:45.26 |
+08:32:59.4 |
HIP 103185 |
22.71 |
| 2026-08-12 12:00 |
20:54:42.24 |
+08:32:43.7 |
HIP 103185 |
22.26 |
| 2026-08-13 00:00 |
20:54:39.23 |
+08:32:27.9 |
HIP 103185 |
21.84 |
| 2026-08-13 12:00 |
20:54:36.22 |
+08:32:11.9 |
HIP 103185 |
21.43 |
| 2026-08-14 00:00 |
20:54:33.22 |
+08:31:55.8 |
HIP 103185 |
21.04 |
| 2026-08-14 12:00 |
20:54:30.22 |
+08:31:39.6 |
HIP 103185 |
20.67 |
| 2026-08-15 00:00 |
20:54:27.23 |
+08:31:23.2 |
HIP 103185 |
20.32 |
| 2026-08-15 12:00 |
20:54:24.24 |
+08:31:06.6 |
HIP 103185 |
20.00 |
| 2026-08-16 00:00 |
20:54:21.26 |
+08:30:49.9 |
HIP 103185 |
19.69 |
| 2026-08-16 12:00 |
20:54:18.28 |
+08:30:33.0 |
HIP 103185 |
19.42 |
| 2026-08-17 00:00 |
20:54:15.31 |
+08:30:16.0 |
HIP 103185 |
19.17 |
| 2026-08-17 12:00 |
20:54:12.35 |
+08:29:58.9 |
HIP 103185 |
18.94 |
| 2026-08-18 00:00 |
20:54:09.39 |
+08:29:41.6 |
HIP 103185 |
18.75 |
| 2026-08-18 12:00 |
20:54:06.44 |
+08:29:24.2 |
HIP 103185 |
18.58 |
| 2026-08-19 00:00 |
20:54:03.49 |
+08:29:06.6 |
HIP 103185 |
18.44 |