| Parameter |
Value |
| Designation |
319P/Catalina-McNaught |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-07-01T22:02:55.170240Z |
| Orbit solution date (soln_date, UTC) |
2025-04-24T09:42:33Z |
| Obs used |
371 |
| NEO |
Yes |
| M1 |
17.100 |
| K1 |
8.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-10-04.0000000 |
| e |
0.66499524 |
| q (au) |
1.196987 |
| a (au) |
3.573045 |
| i (deg) |
15.074177 |
| Ω (om, deg) |
111.366470 |
| ω (w, deg) |
203.679689 |
| M (ma, deg) |
267.200002 |
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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
10:39:27.15 |
+17:28:48.8 |
HIP 52026 |
26.96 |
| 2026-09-20 12:00 |
10:39:49.13 |
+17:27:11.3 |
HIP 52026 |
31.16 |
| 2026-09-21 00:00 |
10:40:11.08 |
+17:25:34.1 |
HIP 52026 |
35.70 |
| 2026-09-21 12:00 |
10:40:33.01 |
+17:23:57.3 |
HIP 52295 |
32.67 |
| 2026-09-22 00:00 |
10:40:54.91 |
+17:22:20.8 |
HIP 52295 |
30.10 |
| 2026-09-22 12:00 |
10:41:16.79 |
+17:20:44.7 |
HIP 52408 |
25.41 |
| 2026-09-23 00:00 |
10:41:38.63 |
+17:19:09.0 |
HIP 52408 |
20.17 |
| 2026-09-23 12:00 |
10:42:00.44 |
+17:17:33.6 |
HIP 52408 |
15.10 |
| 2026-09-24 00:00 |
10:42:22.23 |
+17:15:58.7 |
HIP 52408 |
10.43 |
| 2026-09-24 12:00 |
10:42:43.98 |
+17:14:24.1 |
HIP 52408 |
6.97 |
| 2026-09-25 00:00 |
10:43:05.71 |
+17:12:49.8 |
HIP 52408 |
6.89 |
| 2026-09-25 12:00 |
10:43:27.40 |
+17:11:16.0 |
HIP 52408 |
10.25 |
| 2026-09-26 00:00 |
10:43:49.06 |
+17:09:42.6 |
HIP 52408 |
14.86 |
| 2026-09-26 12:00 |
10:44:10.69 |
+17:08:09.6 |
HIP 52408 |
19.88 |
| 2026-09-27 00:00 |
10:44:32.28 |
+17:06:37.0 |
HIP 52408 |
25.04 |
| 2026-09-27 12:00 |
10:44:53.84 |
+17:05:04.8 |
HIP 52703 |
26.93 |
| 2026-09-28 00:00 |
10:45:15.37 |
+17:03:33.0 |
HIP 52703 |
21.71 |
| 2026-09-28 12:00 |
10:45:36.86 |
+17:02:01.6 |
HIP 52703 |
16.60 |
| 2026-09-29 00:00 |
10:45:58.31 |
+17:00:30.7 |
HIP 52703 |
11.71 |
| 2026-09-29 12:00 |
10:46:19.73 |
+16:59:00.2 |
HIP 52703 |
7.50 |
| 2026-09-30 00:00 |
10:46:41.12 |
+16:57:30.1 |
HIP 52703 |
5.69 |
| 2026-09-30 12:00 |
10:47:02.46 |
+16:56:00.5 |
HIP 52768 |
4.76 |
| 2026-10-01 00:00 |
10:47:23.77 |
+16:54:31.3 |
HIP 52768 |
0.91 |
| 2026-10-01 12:00 |
10:47:45.04 |
+16:53:02.6 |
HIP 52768 |
5.93 |
| 2026-10-02 00:00 |
10:48:06.27 |
+16:51:34.4 |
HIP 52768 |
11.20 |
| 2026-10-02 12:00 |
10:48:27.46 |
+16:50:06.6 |
HIP 52768 |
16.47 |
| 2026-10-03 00:00 |
10:48:48.61 |
+16:48:39.3 |
HIP 52938 |
21.26 |
| 2026-10-03 12:00 |
10:49:09.72 |
+16:47:12.4 |
HIP 52938 |
17.80 |
| 2026-10-04 00:00 |
10:49:30.78 |
+16:45:46.1 |
HIP 52938 |
15.39 |
| 2026-10-04 12:00 |
10:49:51.81 |
+16:44:20.2 |
HIP 52938 |
14.56 |
| 2026-10-05 00:00 |
10:50:12.79 |
+16:42:54.9 |
HIP 52938 |
15.56 |
| 2026-10-05 12:00 |
10:50:33.72 |
+16:41:30.0 |
HIP 52938 |
18.08 |
| 2026-10-06 00:00 |
10:50:54.61 |
+16:40:05.7 |
HIP 52938 |
21.58 |
| 2026-10-06 12:00 |
10:51:15.46 |
+16:38:41.9 |
HIP 53208 |
24.68 |
| 2026-10-07 00:00 |
10:51:36.26 |
+16:37:18.6 |
HIP 53208 |
19.91 |
| 2026-10-07 12:00 |
10:51:57.01 |
+16:35:55.8 |
HIP 53208 |
15.42 |
| 2026-10-08 00:00 |
10:52:17.71 |
+16:34:33.6 |
HIP 53208 |
11.50 |
| 2026-10-08 12:00 |
10:52:38.36 |
+16:33:12.0 |
HIP 53208 |
8.93 |
| 2026-10-09 00:00 |
10:52:58.96 |
+16:31:50.8 |
HIP 53208 |
8.92 |
| 2026-10-09 12:00 |
10:53:19.52 |
+16:30:30.3 |
HIP 53208 |
11.47 |
| 2026-10-10 00:00 |
10:53:40.02 |
+16:29:10.3 |
HIP 53208 |
15.34 |
| 2026-10-10 12:00 |
10:54:00.47 |
+16:27:50.9 |
HIP 53208 |
19.75 |
| 2026-10-11 00:00 |
10:54:20.86 |
+16:26:32.1 |
HIP 53208 |
24.41 |