| Parameter |
Value |
| Designation |
296P/Garradd |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-03-01T06:43:40.719360Z |
| Orbit solution date (soln_date, UTC) |
2021-07-01T22:13:08Z |
| Obs used |
333 |
| NEO |
- |
| M1 |
12.800 |
| K1 |
15.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-07-21.0000000 |
| e |
0.47734904 |
| q (au) |
1.830682 |
| a (au) |
3.502686 |
| i (deg) |
25.203980 |
| Ω (om, deg) |
263.676488 |
| ω (w, deg) |
350.027681 |
| M (ma, deg) |
21.307492 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.031 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.031 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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) |
| 2026-07-29 00:00 |
09:52:00.18 |
-07:14:36.8 |
HIP 48286 |
21.30 |
| 2026-07-29 12:00 |
09:52:47.98 |
-07:18:15.4 |
HIP 48427 |
18.93 |
| 2026-07-30 00:00 |
09:53:35.88 |
-07:21:55.4 |
HIP 48427 |
23.32 |
| 2026-07-30 12:00 |
09:54:23.88 |
-07:25:36.9 |
HIP 48651 |
20.17 |
| 2026-07-31 00:00 |
09:55:11.99 |
-07:29:19.8 |
HIP 48651 |
11.97 |
| 2026-07-31 12:00 |
09:56:00.19 |
-07:33:04.1 |
HIP 48712 |
5.97 |
| 2026-08-01 00:00 |
09:56:48.48 |
-07:36:49.9 |
HIP 48712 |
10.20 |
| 2026-08-01 12:00 |
09:57:36.88 |
-07:40:37.0 |
HIP 48712 |
22.10 |
| 2026-08-02 00:00 |
09:58:25.38 |
-07:44:25.6 |
HIP 48978 |
18.23 |
| 2026-08-02 12:00 |
09:59:13.97 |
-07:48:15.6 |
HIP 48978 |
5.74 |
| 2026-08-03 00:00 |
10:00:02.67 |
-07:52:06.9 |
HIP 48978 |
7.29 |
| 2026-08-03 12:00 |
10:00:51.46 |
-07:55:59.7 |
HIP 48978 |
19.87 |
| 2026-08-04 00:00 |
10:01:40.35 |
-07:59:53.9 |
HIP 48978 |
32.57 |
| 2026-08-04 12:00 |
10:02:29.34 |
-08:03:49.5 |
HIP 49210 |
26.71 |
| 2026-08-05 00:00 |
10:03:18.43 |
-08:07:46.5 |
HIP 49305 |
17.24 |
| 2026-08-05 12:00 |
10:04:07.61 |
-08:11:44.9 |
HIP 49305 |
12.20 |
| 2026-08-06 00:00 |
10:04:56.90 |
-08:15:44.7 |
HIP 49305 |
18.14 |
| 2026-08-06 12:00 |
10:05:46.28 |
-08:19:45.8 |
HIP 49305 |
28.97 |
| 2026-08-07 00:00 |
10:06:35.76 |
-08:23:48.4 |
HIP 49370 |
40.12 |
| 2026-08-07 12:00 |
10:07:25.34 |
-08:27:52.3 |
HIP 49752 |
32.86 |
| 2026-08-08 00:00 |
10:08:15.02 |
-08:31:57.6 |
HIP 49752 |
20.21 |
| 2026-08-08 12:00 |
10:09:04.80 |
-08:36:04.3 |
HIP 49752 |
8.45 |
| 2026-08-09 00:00 |
10:09:54.68 |
-08:40:12.3 |
HIP 49752 |
8.44 |
| 2026-08-09 12:00 |
10:10:44.65 |
-08:44:21.8 |
HIP 49865 |
19.46 |
| 2026-08-10 00:00 |
10:11:34.72 |
-08:48:32.6 |
HIP 49865 |
25.33 |
| 2026-08-10 12:00 |
10:12:24.89 |
-08:52:44.7 |
HIP 50061 |
28.97 |
| 2026-08-11 00:00 |
10:13:15.16 |
-08:56:58.2 |
HIP 50021 |
26.38 |
| 2026-08-11 12:00 |
10:14:05.52 |
-09:01:13.1 |
HIP 50202 |
21.01 |
| 2026-08-12 00:00 |
10:14:55.98 |
-09:05:29.3 |
HIP 50202 |
21.06 |
| 2026-08-12 12:00 |
10:15:46.54 |
-09:09:46.8 |
HIP 50363 |
19.61 |
| 2026-08-13 00:00 |
10:16:37.19 |
-09:14:05.7 |
HIP 50363 |
12.91 |
| 2026-08-13 12:00 |
10:17:27.94 |
-09:18:25.8 |
HIP 50363 |
17.31 |
| 2026-08-14 00:00 |
10:18:18.79 |
-09:22:47.4 |
HIP 50523 |
13.03 |
| 2026-08-14 12:00 |
10:19:09.73 |
-09:27:10.2 |
HIP 50523 |
7.05 |
| 2026-08-15 00:00 |
10:20:00.77 |
-09:31:34.3 |
HIP 50523 |
16.88 |
| 2026-08-15 12:00 |
10:20:51.90 |
-09:35:59.7 |
HIP 50747 |
16.44 |
| 2026-08-16 00:00 |
10:21:43.13 |
-09:40:26.5 |
HIP 50747 |
5.99 |
| 2026-08-16 12:00 |
10:22:34.45 |
-09:44:54.5 |
HIP 50747 |
12.66 |
| 2026-08-17 00:00 |
10:23:25.87 |
-09:49:23.8 |
HIP 50986 |
22.37 |
| 2026-08-17 12:00 |
10:24:17.39 |
-09:53:54.3 |
HIP 50986 |
11.51 |
| 2026-08-18 00:00 |
10:25:09.00 |
-09:58:26.1 |
HIP 51053 |
11.04 |
| 2026-08-18 12:00 |
10:26:00.70 |
-10:02:59.2 |
HIP 51053 |
2.50 |
| 2026-08-19 00:00 |
10:26:52.50 |
-10:07:33.6 |
HIP 51053 |
16.03 |