| Parameter |
Value |
| Designation |
P/2013 R3 (Catalina-PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-08-05T03:50:44.286720Z |
| Orbit solution date (soln_date, UTC) |
2022-11-07T07:13:07Z |
| Obs used |
324 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
30.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-10-13.0000000 |
| e |
0.27344549 |
| q (au) |
2.203607 |
| a (au) |
3.032955 |
| i (deg) |
0.898900 |
| Ω (om, deg) |
342.683923 |
| ω (w, deg) |
8.238778 |
| M (ma, deg) |
12.845309 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.273 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.273 |
| n |
2.000 |
| gf |
0.981 |
| gb |
-0.824 |
| k |
0.999 |
| δ90 |
9.997 |
| 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 |
09:19:34.28 |
+15:44:46.6 |
HIP 45777 |
13.21 |
| 2026-05-12 12:00 |
09:19:49.71 |
+15:43:31.1 |
HIP 45777 |
13.04 |
| 2026-05-13 00:00 |
09:20:05.33 |
+15:42:14.6 |
HIP 45777 |
14.03 |
| 2026-05-13 12:00 |
09:20:21.14 |
+15:40:57.2 |
HIP 45777 |
16.00 |
| 2026-05-14 00:00 |
09:20:37.14 |
+15:39:38.9 |
HIP 45777 |
18.68 |
| 2026-05-14 12:00 |
09:20:53.32 |
+15:38:19.6 |
HIP 45874 |
16.90 |
| 2026-05-15 00:00 |
09:21:09.69 |
+15:36:59.4 |
HIP 45874 |
14.77 |
| 2026-05-15 12:00 |
09:21:26.25 |
+15:35:38.2 |
HIP 45874 |
13.61 |
| 2026-05-16 00:00 |
09:21:42.98 |
+15:34:16.2 |
HIP 45874 |
13.71 |
| 2026-05-16 12:00 |
09:21:59.90 |
+15:32:53.2 |
HIP 45874 |
15.09 |
| 2026-05-17 00:00 |
09:22:17.00 |
+15:31:29.3 |
HIP 45989 |
16.67 |
| 2026-05-17 12:00 |
09:22:34.27 |
+15:30:04.4 |
HIP 45989 |
16.78 |
| 2026-05-18 00:00 |
09:22:51.73 |
+15:28:38.7 |
HIP 45989 |
18.01 |
| 2026-05-18 12:00 |
09:23:09.35 |
+15:27:12.0 |
HIP 45989 |
20.19 |
| 2026-05-19 00:00 |
09:23:27.15 |
+15:25:44.5 |
HIP 45989 |
23.08 |
| 2026-05-19 12:00 |
09:23:45.13 |
+15:24:16.0 |
HIP 45989 |
26.47 |
| 2026-05-20 00:00 |
09:24:03.27 |
+15:22:46.7 |
HIP 45989 |
30.21 |
| 2026-05-20 12:00 |
09:24:21.58 |
+15:21:16.4 |
HIP 45989 |
34.20 |
| 2026-05-21 00:00 |
09:24:40.06 |
+15:19:45.3 |
HIP 46318 |
31.74 |
| 2026-05-21 12:00 |
09:24:58.71 |
+15:18:13.3 |
HIP 46318 |
27.01 |
| 2026-05-22 00:00 |
09:25:17.51 |
+15:16:40.4 |
HIP 46318 |
22.25 |
| 2026-05-22 12:00 |
09:25:36.49 |
+15:15:06.7 |
HIP 46318 |
17.46 |
| 2026-05-23 00:00 |
09:25:55.62 |
+15:13:32.0 |
HIP 46318 |
12.66 |
| 2026-05-23 12:00 |
09:26:14.91 |
+15:11:56.5 |
HIP 46318 |
7.93 |
| 2026-05-24 00:00 |
09:26:34.36 |
+15:10:20.2 |
HIP 46318 |
3.68 |
| 2026-05-24 12:00 |
09:26:53.96 |
+15:08:43.0 |
HIP 46318 |
3.69 |
| 2026-05-25 00:00 |
09:27:13.72 |
+15:07:05.0 |
HIP 46318 |
8.02 |
| 2026-05-25 12:00 |
09:27:33.64 |
+15:05:26.1 |
HIP 46318 |
12.92 |
| 2026-05-26 00:00 |
09:27:53.70 |
+15:03:46.4 |
HIP 46449 |
9.81 |
| 2026-05-26 12:00 |
09:28:13.91 |
+15:02:05.8 |
HIP 46449 |
8.31 |
| 2026-05-27 00:00 |
09:28:34.28 |
+15:00:24.4 |
HIP 46449 |
9.77 |
| 2026-05-27 12:00 |
09:28:54.79 |
+14:58:42.2 |
HIP 46449 |
13.29 |
| 2026-05-28 00:00 |
09:29:15.45 |
+14:56:59.1 |
HIP 46449 |
17.72 |
| 2026-05-28 12:00 |
09:29:36.25 |
+14:55:15.3 |
HIP 46449 |
22.55 |
| 2026-05-29 00:00 |
09:29:57.19 |
+14:53:30.6 |
HIP 46635 |
23.94 |
| 2026-05-29 12:00 |
09:30:18.28 |
+14:51:45.1 |
HIP 46635 |
24.21 |
| 2026-05-30 00:00 |
09:30:39.51 |
+14:49:58.8 |
HIP 46635 |
25.65 |
| 2026-05-30 12:00 |
09:31:00.88 |
+14:48:11.6 |
HIP 46635 |
28.10 |
| 2026-05-31 00:00 |
09:31:22.38 |
+14:46:23.7 |
HIP 46635 |
31.35 |
| 2026-05-31 12:00 |
09:31:44.03 |
+14:44:35.0 |
HIP 46864 |
26.90 |
| 2026-06-01 00:00 |
09:32:05.80 |
+14:42:45.5 |
HIP 46864 |
22.21 |
| 2026-06-01 12:00 |
09:32:27.72 |
+14:40:55.2 |
HIP 46864 |
18.00 |
| 2026-06-02 00:00 |
09:32:49.76 |
+14:39:04.1 |
HIP 46864 |
14.74 |