| Parameter |
Value |
| Designation |
259P/Garradd |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-01-25T05:54:24.387840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:08Z |
| Obs used |
68 |
| NEO |
- |
| M1 |
13.700 |
| K1 |
22.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2011-02-26.0000000 |
| e |
0.34152970 |
| q (au) |
1.795939 |
| a (au) |
2.727441 |
| i (deg) |
15.898537 |
| Ω (om, deg) |
51.969696 |
| ω (w, deg) |
256.590906 |
| M (ma, deg) |
206.996592 |
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) |
| 2026-06-01 00:00 |
20:26:35.23 |
-39:19:56.5 |
HIP 100874 |
9.91 |
| 2026-06-01 12:00 |
20:27:08.23 |
-39:27:12.2 |
HIP 100904 |
6.80 |
| 2026-06-02 00:00 |
20:27:40.81 |
-39:34:30.3 |
HIP 100904 |
2.93 |
| 2026-06-02 12:00 |
20:28:12.95 |
-39:41:50.8 |
HIP 100904 |
12.48 |
| 2026-06-03 00:00 |
20:28:44.66 |
-39:49:13.7 |
HIP 100904 |
22.05 |
| 2026-06-03 12:00 |
20:29:15.94 |
-39:56:38.9 |
HIP 101063 |
28.37 |
| 2026-06-04 00:00 |
20:29:46.76 |
-40:04:06.4 |
HIP 101063 |
21.73 |
| 2026-06-04 12:00 |
20:30:17.13 |
-40:11:36.2 |
HIP 101063 |
17.80 |
| 2026-06-05 00:00 |
20:30:47.05 |
-40:19:08.2 |
HIP 101063 |
18.35 |
| 2026-06-05 12:00 |
20:31:16.50 |
-40:26:42.5 |
HIP 101063 |
23.03 |
| 2026-06-06 00:00 |
20:31:45.48 |
-40:34:18.9 |
HIP 101292 |
19.82 |
| 2026-06-06 12:00 |
20:32:13.98 |
-40:41:57.4 |
HIP 101292 |
12.78 |
| 2026-06-07 00:00 |
20:32:42.01 |
-40:49:38.1 |
HIP 101292 |
10.33 |
| 2026-06-07 12:00 |
20:33:09.55 |
-40:57:20.8 |
HIP 101454 |
8.83 |
| 2026-06-08 00:00 |
20:33:36.59 |
-41:05:05.6 |
HIP 101454 |
1.80 |
| 2026-06-08 12:00 |
20:34:03.14 |
-41:12:52.3 |
HIP 101454 |
10.02 |
| 2026-06-09 00:00 |
20:34:29.18 |
-41:20:41.0 |
HIP 101432 |
16.44 |
| 2026-06-09 12:00 |
20:34:54.72 |
-41:28:31.5 |
HIP 101432 |
17.43 |
| 2026-06-10 00:00 |
20:35:19.73 |
-41:36:23.8 |
HIP 101432 |
22.40 |
| 2026-06-10 12:00 |
20:35:44.23 |
-41:44:17.9 |
HIP 101557 |
17.55 |
| 2026-06-11 00:00 |
20:36:08.20 |
-41:52:13.7 |
HIP 101557 |
15.37 |
| 2026-06-11 12:00 |
20:36:31.63 |
-42:00:11.2 |
HIP 101557 |
18.06 |
| 2026-06-12 00:00 |
20:36:54.53 |
-42:08:10.3 |
HIP 101557 |
24.00 |
| 2026-06-12 12:00 |
20:37:16.88 |
-42:16:10.8 |
HIP 101557 |
31.37 |
| 2026-06-13 00:00 |
20:37:38.69 |
-42:24:12.8 |
HIP 101954 |
33.29 |
| 2026-06-13 12:00 |
20:37:59.94 |
-42:32:16.2 |
HIP 101954 |
24.73 |
| 2026-06-14 00:00 |
20:38:20.63 |
-42:40:20.9 |
HIP 101954 |
16.68 |
| 2026-06-14 12:00 |
20:38:40.76 |
-42:48:26.8 |
HIP 101954 |
10.35 |
| 2026-06-15 00:00 |
20:39:00.32 |
-42:56:33.9 |
HIP 101954 |
9.82 |
| 2026-06-15 12:00 |
20:39:19.31 |
-43:04:42.0 |
HIP 102015 |
11.22 |
| 2026-06-16 00:00 |
20:39:37.73 |
-43:12:51.0 |
HIP 102015 |
11.93 |
| 2026-06-16 12:00 |
20:39:55.57 |
-43:21:01.0 |
HIP 101977 |
15.37 |
| 2026-06-17 00:00 |
20:40:12.82 |
-43:29:11.8 |
HIP 101977 |
7.72 |
| 2026-06-17 12:00 |
20:40:29.49 |
-43:37:23.2 |
HIP 101977 |
5.91 |
| 2026-06-18 00:00 |
20:40:45.58 |
-43:45:35.3 |
HIP 101977 |
12.69 |
| 2026-06-18 12:00 |
20:41:01.07 |
-43:53:47.9 |
HIP 101977 |
20.88 |
| 2026-06-19 00:00 |
20:41:15.96 |
-44:02:00.9 |
HIP 102263 |
21.57 |
| 2026-06-19 12:00 |
20:41:30.26 |
-44:10:14.3 |
HIP 102263 |
19.54 |
| 2026-06-20 00:00 |
20:41:43.95 |
-44:18:27.8 |
HIP 102263 |
21.23 |
| 2026-06-20 12:00 |
20:41:57.04 |
-44:26:41.5 |
HIP 102263 |
25.90 |
| 2026-06-21 00:00 |
20:42:09.53 |
-44:34:55.3 |
HIP 102181 |
18.22 |
| 2026-06-21 12:00 |
20:42:21.40 |
-44:43:09.0 |
HIP 102181 |
10.01 |
| 2026-06-22 00:00 |
20:42:32.66 |
-44:51:22.5 |
HIP 102181 |
3.47 |