| 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) |
| 2026-06-01 00:00 |
21:00:51.86 |
+08:38:59.5 |
HIP 103586 |
23.41 |
| 2026-06-01 12:00 |
21:00:50.41 |
+08:39:10.1 |
HIP 103586 |
23.06 |
| 2026-06-02 00:00 |
21:00:48.95 |
+08:39:20.5 |
HIP 103586 |
22.70 |
| 2026-06-02 12:00 |
21:00:47.46 |
+08:39:30.8 |
HIP 103586 |
22.35 |
| 2026-06-03 00:00 |
21:00:45.95 |
+08:39:40.9 |
HIP 103586 |
21.98 |
| 2026-06-03 12:00 |
21:00:44.42 |
+08:39:50.8 |
HIP 103586 |
21.62 |
| 2026-06-04 00:00 |
21:00:42.87 |
+08:40:00.6 |
HIP 103586 |
21.25 |
| 2026-06-04 12:00 |
21:00:41.30 |
+08:40:10.2 |
HIP 103586 |
20.88 |
| 2026-06-05 00:00 |
21:00:39.70 |
+08:40:19.7 |
HIP 103586 |
20.50 |
| 2026-06-05 12:00 |
21:00:38.08 |
+08:40:28.9 |
HIP 103586 |
20.12 |
| 2026-06-06 00:00 |
21:00:36.45 |
+08:40:38.1 |
HIP 103586 |
19.73 |
| 2026-06-06 12:00 |
21:00:34.78 |
+08:40:47.0 |
HIP 103586 |
19.34 |
| 2026-06-07 00:00 |
21:00:33.10 |
+08:40:55.8 |
HIP 103586 |
18.95 |
| 2026-06-07 12:00 |
21:00:31.40 |
+08:41:04.4 |
HIP 103586 |
18.56 |
| 2026-06-08 00:00 |
21:00:29.68 |
+08:41:12.8 |
HIP 103586 |
18.16 |
| 2026-06-08 12:00 |
21:00:27.93 |
+08:41:21.1 |
HIP 103586 |
17.75 |
| 2026-06-09 00:00 |
21:00:26.16 |
+08:41:29.2 |
HIP 103586 |
17.35 |
| 2026-06-09 12:00 |
21:00:24.38 |
+08:41:37.1 |
HIP 103586 |
16.94 |
| 2026-06-10 00:00 |
21:00:22.57 |
+08:41:44.8 |
HIP 103586 |
16.53 |
| 2026-06-10 12:00 |
21:00:20.74 |
+08:41:52.4 |
HIP 103586 |
16.12 |
| 2026-06-11 00:00 |
21:00:18.89 |
+08:41:59.8 |
HIP 103586 |
15.70 |
| 2026-06-11 12:00 |
21:00:17.02 |
+08:42:07.0 |
HIP 103586 |
15.28 |
| 2026-06-12 00:00 |
21:00:15.13 |
+08:42:14.1 |
HIP 103586 |
14.86 |
| 2026-06-12 12:00 |
21:00:13.22 |
+08:42:20.9 |
HIP 103586 |
14.44 |
| 2026-06-13 00:00 |
21:00:11.29 |
+08:42:27.6 |
HIP 103586 |
14.02 |
| 2026-06-13 12:00 |
21:00:09.35 |
+08:42:34.1 |
HIP 103586 |
13.59 |
| 2026-06-14 00:00 |
21:00:07.38 |
+08:42:40.4 |
HIP 103586 |
13.16 |
| 2026-06-14 12:00 |
21:00:05.39 |
+08:42:46.6 |
HIP 103586 |
12.74 |
| 2026-06-15 00:00 |
21:00:03.38 |
+08:42:52.5 |
HIP 103586 |
12.31 |
| 2026-06-15 12:00 |
21:00:01.35 |
+08:42:58.3 |
HIP 103586 |
11.89 |
| 2026-06-16 00:00 |
20:59:59.30 |
+08:43:03.9 |
HIP 103586 |
11.46 |
| 2026-06-16 12:00 |
20:59:57.24 |
+08:43:09.3 |
HIP 103586 |
11.04 |
| 2026-06-17 00:00 |
20:59:55.15 |
+08:43:14.5 |
HIP 103586 |
10.62 |
| 2026-06-17 12:00 |
20:59:53.05 |
+08:43:19.6 |
HIP 103586 |
10.21 |
| 2026-06-18 00:00 |
20:59:50.93 |
+08:43:24.4 |
HIP 103586 |
9.80 |
| 2026-06-18 12:00 |
20:59:48.79 |
+08:43:29.1 |
HIP 103586 |
9.39 |
| 2026-06-19 00:00 |
20:59:46.63 |
+08:43:33.5 |
HIP 103586 |
9.00 |
| 2026-06-19 12:00 |
20:59:44.45 |
+08:43:37.8 |
HIP 103586 |
8.61 |
| 2026-06-20 00:00 |
20:59:42.26 |
+08:43:41.9 |
HIP 103586 |
8.24 |
| 2026-06-20 12:00 |
20:59:40.04 |
+08:43:45.8 |
HIP 103586 |
7.89 |
| 2026-06-21 00:00 |
20:59:37.81 |
+08:43:49.6 |
HIP 103586 |
7.55 |
| 2026-06-21 12:00 |
20:59:35.57 |
+08:43:53.1 |
HIP 103586 |
7.23 |
| 2026-06-22 00:00 |
20:59:33.30 |
+08:43:56.5 |
HIP 103586 |
6.94 |