P/2013 R3 (Catalina-PANSTARRS)
| 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) |
| 2026-02-03 00:00 |
09:45:37.07 |
+13:55:40.4 |
HIP 47994 |
23.62 |
| 2026-02-03 12:00 |
09:45:13.63 |
+13:57:36.2 |
HIP 47723 |
22.08 |
| 2026-02-04 00:00 |
09:44:50.12 |
+13:59:32.2 |
HIP 47723 |
16.16 |
| 2026-02-04 12:00 |
09:44:26.53 |
+14:01:28.4 |
HIP 47723 |
10.34 |
| 2026-02-05 00:00 |
09:44:02.87 |
+14:03:24.7 |
HIP 47723 |
5.06 |
| 2026-02-05 12:00 |
09:43:39.15 |
+14:05:21.1 |
HIP 47723 |
4.21 |
| 2026-02-06 00:00 |
09:43:15.36 |
+14:07:17.7 |
HIP 47723 |
9.15 |
| 2026-02-06 12:00 |
09:42:51.52 |
+14:09:14.2 |
HIP 47723 |
14.98 |
| 2026-02-07 00:00 |
09:42:27.63 |
+14:11:10.8 |
HIP 47503 |
20.22 |
| 2026-02-07 12:00 |
09:42:03.70 |
+14:13:07.4 |
HIP 47503 |
15.15 |
| 2026-02-08 00:00 |
09:41:39.73 |
+14:15:04.0 |
HIP 47503 |
11.18 |
| 2026-02-08 12:00 |
09:41:15.72 |
+14:17:00.5 |
HIP 47503 |
9.77 |
| 2026-02-09 00:00 |
09:40:51.69 |
+14:18:56.9 |
HIP 47503 |
11.88 |
| 2026-02-09 12:00 |
09:40:27.63 |
+14:20:53.3 |
HIP 47503 |
16.19 |
| 2026-02-10 00:00 |
09:40:03.55 |
+14:22:49.5 |
HIP 47368 |
14.66 |
| 2026-02-10 12:00 |
09:39:39.46 |
+14:24:45.5 |
HIP 47368 |
8.63 |
| 2026-02-11 00:00 |
09:39:15.36 |
+14:26:41.3 |
HIP 47368 |
3.09 |
| 2026-02-11 12:00 |
09:38:51.26 |
+14:28:37.0 |
HIP 47368 |
4.49 |
| 2026-02-12 00:00 |
09:38:27.17 |
+14:30:32.4 |
HIP 47368 |
10.31 |
| 2026-02-12 12:00 |
09:38:03.08 |
+14:32:27.5 |
HIP 47266 |
11.62 |
| 2026-02-13 00:00 |
09:37:39.01 |
+14:34:22.3 |
HIP 47266 |
14.56 |
| 2026-02-13 12:00 |
09:37:14.96 |
+14:36:16.8 |
HIP 47266 |
19.08 |
| 2026-02-14 00:00 |
09:36:50.93 |
+14:38:11.0 |
HIP 47096 |
20.85 |
| 2026-02-14 12:00 |
09:36:26.93 |
+14:40:04.7 |
HIP 47096 |
19.16 |
| 2026-02-15 00:00 |
09:36:02.97 |
+14:41:58.1 |
HIP 47096 |
19.35 |
| 2026-02-15 12:00 |
09:35:39.06 |
+14:43:51.1 |
HIP 46969 |
20.25 |
| 2026-02-16 00:00 |
09:35:15.19 |
+14:45:43.6 |
HIP 46969 |
16.30 |
| 2026-02-16 12:00 |
09:34:51.37 |
+14:47:35.6 |
HIP 46969 |
13.96 |
| 2026-02-17 00:00 |
09:34:27.61 |
+14:49:27.1 |
HIP 46969 |
14.05 |
| 2026-02-17 12:00 |
09:34:03.91 |
+14:51:18.1 |
HIP 46969 |
16.50 |
| 2026-02-18 00:00 |
09:33:40.29 |
+14:53:08.5 |
HIP 46969 |
20.47 |
| 2026-02-18 12:00 |
09:33:16.73 |
+14:54:58.3 |
HIP 46969 |
25.24 |
| 2026-02-19 00:00 |
09:32:53.26 |
+14:56:47.6 |
HIP 46969 |
30.41 |
| 2026-02-19 12:00 |
09:32:29.87 |
+14:58:36.2 |
HIP 46635 |
32.46 |
| 2026-02-20 00:00 |
09:32:06.58 |
+15:00:24.1 |
HIP 46635 |
26.77 |
| 2026-02-20 12:00 |
09:31:43.37 |
+15:02:11.4 |
HIP 46635 |
21.21 |
| 2026-02-21 00:00 |
09:31:20.27 |
+15:03:58.0 |
HIP 46635 |
15.92 |
| 2026-02-21 12:00 |
09:30:57.28 |
+15:05:43.9 |
HIP 46635 |
11.21 |
| 2026-02-22 00:00 |
09:30:34.40 |
+15:07:29.0 |
HIP 46635 |
8.13 |
| 2026-02-22 12:00 |
09:30:11.63 |
+15:09:13.3 |
HIP 46635 |
8.57 |
| 2026-02-23 00:00 |
09:29:48.98 |
+15:10:56.9 |
HIP 46635 |
12.11 |
| 2026-02-23 12:00 |
09:29:26.46 |
+15:12:39.7 |
HIP 46449 |
15.00 |
| 2026-02-24 00:00 |
09:29:04.07 |
+15:14:21.6 |
HIP 46449 |
10.34 |