| Parameter |
Value |
| Designation |
C/2008 J5 (Garradd) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-04-01T01:47:02.302080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:19Z |
| Obs used |
128 |
| NEO |
- |
| M1 |
10.600 |
| K1 |
17.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2008-06-25.0000000 |
| e |
0.97288948 |
| q (au) |
1.963842 |
| a (au) |
72.438378 |
| i (deg) |
93.270724 |
| Ω (om, deg) |
287.075696 |
| ω (w, deg) |
313.376402 |
| M (ma, deg) |
0.135766 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.954 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.954 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.798 |
| k |
0.998 |
| 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) |
| 2026-05-12 00:00 |
14:03:07.61 |
+81:16:58.3 |
HIP 68832 |
20.22 |
| 2026-05-12 12:00 |
14:02:46.54 |
+81:16:42.6 |
HIP 68832 |
20.70 |
| 2026-05-13 00:00 |
14:02:25.56 |
+81:16:26.5 |
HIP 68832 |
21.21 |
| 2026-05-13 12:00 |
14:02:04.66 |
+81:16:09.9 |
HIP 68832 |
21.74 |
| 2026-05-14 00:00 |
14:01:43.85 |
+81:15:52.8 |
HIP 68832 |
22.30 |
| 2026-05-14 12:00 |
14:01:23.13 |
+81:15:35.2 |
HIP 68832 |
22.88 |
| 2026-05-15 00:00 |
14:01:02.50 |
+81:15:17.2 |
HIP 68832 |
23.48 |
| 2026-05-15 12:00 |
14:00:41.96 |
+81:14:58.7 |
HIP 68104 |
23.73 |
| 2026-05-16 00:00 |
14:00:21.51 |
+81:14:39.8 |
HIP 68104 |
23.74 |
| 2026-05-16 12:00 |
14:00:01.17 |
+81:14:20.4 |
HIP 68104 |
23.79 |
| 2026-05-17 00:00 |
13:59:40.92 |
+81:14:00.5 |
HIP 68104 |
23.87 |
| 2026-05-17 12:00 |
13:59:20.77 |
+81:13:40.2 |
HIP 68104 |
23.99 |
| 2026-05-18 00:00 |
13:59:00.73 |
+81:13:19.5 |
HIP 68104 |
24.14 |
| 2026-05-18 12:00 |
13:58:40.79 |
+81:12:58.3 |
HIP 68104 |
24.34 |
| 2026-05-19 00:00 |
13:58:20.96 |
+81:12:36.6 |
HIP 68104 |
24.56 |
| 2026-05-19 12:00 |
13:58:01.24 |
+81:12:14.5 |
HIP 68104 |
24.82 |
| 2026-05-20 00:00 |
13:57:41.63 |
+81:11:52.0 |
HIP 68104 |
25.11 |
| 2026-05-20 12:00 |
13:57:22.13 |
+81:11:29.0 |
HIP 68104 |
25.43 |
| 2026-05-21 00:00 |
13:57:02.75 |
+81:11:05.6 |
HIP 68104 |
25.77 |
| 2026-05-21 12:00 |
13:56:43.49 |
+81:10:41.8 |
HIP 68104 |
26.15 |
| 2026-05-22 00:00 |
13:56:24.34 |
+81:10:17.6 |
HIP 68104 |
26.56 |
| 2026-05-22 12:00 |
13:56:05.31 |
+81:09:52.9 |
HIP 67592 |
26.64 |
| 2026-05-23 00:00 |
13:55:46.40 |
+81:09:27.8 |
HIP 67592 |
25.94 |
| 2026-05-23 12:00 |
13:55:27.62 |
+81:09:02.3 |
HIP 67592 |
25.25 |
| 2026-05-24 00:00 |
13:55:08.96 |
+81:08:36.4 |
HIP 67592 |
24.56 |
| 2026-05-24 12:00 |
13:54:50.43 |
+81:08:10.1 |
HIP 67592 |
23.87 |
| 2026-05-25 00:00 |
13:54:32.02 |
+81:07:43.4 |
HIP 67592 |
23.19 |
| 2026-05-25 12:00 |
13:54:13.74 |
+81:07:16.3 |
HIP 67592 |
22.52 |
| 2026-05-26 00:00 |
13:53:55.60 |
+81:06:48.7 |
HIP 67592 |
21.85 |
| 2026-05-26 12:00 |
13:53:37.58 |
+81:06:20.8 |
HIP 67592 |
21.19 |
| 2026-05-27 00:00 |
13:53:19.70 |
+81:05:52.5 |
HIP 67592 |
20.55 |
| 2026-05-27 12:00 |
13:53:01.95 |
+81:05:23.8 |
HIP 67592 |
19.91 |
| 2026-05-28 00:00 |
13:52:44.33 |
+81:04:54.7 |
HIP 67592 |
19.28 |
| 2026-05-28 12:00 |
13:52:26.86 |
+81:04:25.3 |
HIP 67592 |
18.66 |
| 2026-05-29 00:00 |
13:52:09.52 |
+81:03:55.4 |
HIP 67592 |
18.06 |
| 2026-05-29 12:00 |
13:51:52.32 |
+81:03:25.2 |
HIP 67592 |
17.47 |
| 2026-05-30 00:00 |
13:51:35.25 |
+81:02:54.6 |
HIP 67592 |
16.89 |
| 2026-05-30 12:00 |
13:51:18.33 |
+81:02:23.7 |
HIP 67592 |
16.33 |
| 2026-05-31 00:00 |
13:51:01.56 |
+81:01:52.3 |
HIP 67592 |
15.80 |
| 2026-05-31 12:00 |
13:50:44.92 |
+81:01:20.6 |
HIP 67592 |
15.28 |
| 2026-06-01 00:00 |
13:50:28.43 |
+81:00:48.6 |
HIP 67592 |
14.79 |
| 2026-06-01 12:00 |
13:50:12.09 |
+81:00:16.2 |
HIP 67592 |
14.32 |
| 2026-06-02 00:00 |
13:49:55.89 |
+80:59:43.4 |
HIP 67592 |
13.89 |