| Parameter |
Value |
| Designation |
259P/Garradd |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-01-25T10:25:09.808320Z |
| Orbit solution date (soln_date, UTC) |
2026-10-01T14:42:13Z |
| Obs used |
86 |
| NEO |
- |
| M1 |
14.300 |
| K1 |
20.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-06-15.0000000 |
| e |
0.34088884 |
| q (au) |
1.797701 |
| a (au) |
2.727463 |
| i (deg) |
15.898952 |
| Ω (om, deg) |
51.959545 |
| ω (w, deg) |
256.560768 |
| M (ma, deg) |
30.757116 |
Magnitude
Scatter + Global Linear
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
20:35:12.03 |
-44:44:39.7 |
HIP 101477 |
19.37 |
| 2026-09-25 12:00 |
20:35:47.02 |
-44:36:37.5 |
HIP 101623 |
16.37 |
| 2026-09-26 00:00 |
20:36:22.41 |
-44:28:33.3 |
HIP 101623 |
10.34 |
| 2026-09-26 12:00 |
20:36:58.18 |
-44:20:27.3 |
HIP 101623 |
12.58 |
| 2026-09-27 00:00 |
20:37:34.33 |
-44:12:19.4 |
HIP 101924 |
19.04 |
| 2026-09-27 12:00 |
20:38:10.86 |
-44:04:09.7 |
HIP 101924 |
12.48 |
| 2026-09-28 00:00 |
20:38:47.75 |
-43:55:58.2 |
HIP 101880 |
12.18 |
| 2026-09-28 12:00 |
20:39:25.01 |
-43:47:44.9 |
HIP 101880 |
8.61 |
| 2026-09-29 00:00 |
20:40:02.62 |
-43:39:29.9 |
HIP 101977 |
3.26 |
| 2026-09-29 12:00 |
20:40:40.58 |
-43:31:13.3 |
HIP 101977 |
9.38 |
| 2026-09-30 00:00 |
20:41:18.89 |
-43:22:54.9 |
HIP 101977 |
20.01 |
| 2026-09-30 12:00 |
20:41:57.54 |
-43:14:34.9 |
HIP 102260 |
14.49 |
| 2026-10-01 00:00 |
20:42:36.52 |
-43:06:13.3 |
HIP 102260 |
14.15 |
| 2026-10-01 12:00 |
20:43:15.82 |
-42:57:50.2 |
HIP 102260 |
20.78 |
| 2026-10-02 00:00 |
20:43:55.45 |
-42:49:25.4 |
HIP 102446 |
19.32 |
| 2026-10-02 12:00 |
20:44:35.40 |
-42:40:59.1 |
HIP 102446 |
19.12 |
| 2026-10-03 00:00 |
20:45:15.67 |
-42:32:31.3 |
HIP 102446 |
24.65 |
| 2026-10-03 12:00 |
20:45:56.24 |
-42:24:02.0 |
HIP 102307 |
32.27 |
| 2026-10-04 00:00 |
20:46:37.11 |
-42:15:31.2 |
HIP 102783 |
31.16 |
| 2026-10-04 12:00 |
20:47:18.29 |
-42:06:59.0 |
HIP 102783 |
23.69 |
| 2026-10-05 00:00 |
20:47:59.76 |
-41:58:25.4 |
HIP 102783 |
20.26 |
| 2026-10-05 12:00 |
20:48:41.51 |
-41:49:50.3 |
HIP 102792 |
11.39 |
| 2026-10-06 00:00 |
20:49:23.56 |
-41:41:13.9 |
HIP 102792 |
1.79 |
| 2026-10-06 12:00 |
20:50:05.89 |
-41:32:36.1 |
HIP 102792 |
12.21 |
| 2026-10-07 00:00 |
20:50:48.49 |
-41:23:57.0 |
HIP 102792 |
23.92 |
| 2026-10-07 12:00 |
20:51:31.36 |
-41:15:16.6 |
HIP 103119 |
25.62 |
| 2026-10-08 00:00 |
20:52:14.51 |
-41:06:34.9 |
HIP 103119 |
15.28 |
| 2026-10-08 12:00 |
20:52:57.91 |
-40:57:52.0 |
HIP 103119 |
9.62 |
| 2026-10-09 00:00 |
20:53:41.58 |
-40:49:07.8 |
HIP 103142 |
2.92 |
| 2026-10-09 12:00 |
20:54:25.50 |
-40:40:22.4 |
HIP 103142 |
9.16 |
| 2026-10-10 00:00 |
20:55:09.67 |
-40:31:35.8 |
HIP 103267 |
2.86 |
| 2026-10-10 12:00 |
20:55:54.09 |
-40:22:48.0 |
HIP 103286 |
10.70 |
| 2026-10-11 00:00 |
20:56:38.75 |
-40:13:59.1 |
HIP 103286 |
13.11 |
| 2026-10-11 12:00 |
20:57:23.64 |
-40:05:09.1 |
HIP 103286 |
23.09 |
| 2026-10-12 00:00 |
20:58:08.77 |
-39:56:18.0 |
HIP 103662 |
25.87 |
| 2026-10-12 12:00 |
20:58:54.13 |
-39:47:25.8 |
HIP 103662 |
24.47 |
| 2026-10-13 00:00 |
20:59:39.71 |
-39:38:32.6 |
HIP 103662 |
28.91 |
| 2026-10-13 12:00 |
21:00:25.51 |
-39:29:38.3 |
HIP 103857 |
29.00 |
| 2026-10-14 00:00 |
21:01:11.52 |
-39:20:43.0 |
HIP 103857 |
17.59 |
| 2026-10-14 12:00 |
21:01:57.74 |
-39:11:46.8 |
HIP 103857 |
9.66 |
| 2026-10-15 00:00 |
21:02:44.17 |
-39:02:49.5 |
HIP 103832 |
6.84 |
| 2026-10-15 12:00 |
21:03:30.81 |
-38:53:51.4 |
HIP 103832 |
13.03 |
| 2026-10-16 00:00 |
21:04:17.63 |
-38:44:52.3 |
HIP 104027 |
15.87 |