| 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) |
| 2026-03-26 00:00 |
09:24:11.11 |
+24:55:42.2 |
HIP 46058 |
17.67 |
| 2026-03-26 12:00 |
09:24:00.00 |
+24:56:09.9 |
HIP 46058 |
16.12 |
| 2026-03-27 00:00 |
09:23:49.07 |
+24:56:36.5 |
HIP 46058 |
14.88 |
| 2026-03-27 12:00 |
09:23:38.31 |
+24:57:02.0 |
HIP 46058 |
14.01 |
| 2026-03-28 00:00 |
09:23:27.73 |
+24:57:26.3 |
HIP 46058 |
13.56 |
| 2026-03-28 12:00 |
09:23:17.33 |
+24:57:49.6 |
HIP 46058 |
13.55 |
| 2026-03-29 00:00 |
09:23:07.11 |
+24:58:11.7 |
HIP 46058 |
13.95 |
| 2026-03-29 12:00 |
09:22:57.07 |
+24:58:32.7 |
HIP 46058 |
14.71 |
| 2026-03-30 00:00 |
09:22:47.21 |
+24:58:52.7 |
HIP 46058 |
15.76 |
| 2026-03-30 12:00 |
09:22:37.53 |
+24:59:11.5 |
HIP 46058 |
17.03 |
| 2026-03-31 00:00 |
09:22:28.04 |
+24:59:29.3 |
HIP 46058 |
18.46 |
| 2026-03-31 12:00 |
09:22:18.72 |
+24:59:46.0 |
HIP 45869 |
18.42 |
| 2026-04-01 00:00 |
09:22:09.59 |
+25:00:01.6 |
HIP 45869 |
16.57 |
| 2026-04-01 12:00 |
09:22:00.64 |
+25:00:16.2 |
HIP 45869 |
14.82 |
| 2026-04-02 00:00 |
09:21:51.88 |
+25:00:29.7 |
HIP 45869 |
13.21 |
| 2026-04-02 12:00 |
09:21:43.30 |
+25:00:42.1 |
HIP 45869 |
11.75 |
| 2026-04-03 00:00 |
09:21:34.91 |
+25:00:53.5 |
HIP 45869 |
10.49 |
| 2026-04-03 12:00 |
09:21:26.71 |
+25:01:03.8 |
HIP 45869 |
9.48 |
| 2026-04-04 00:00 |
09:21:18.69 |
+25:01:13.0 |
HIP 45869 |
8.79 |
| 2026-04-04 12:00 |
09:21:10.85 |
+25:01:21.3 |
HIP 45869 |
8.46 |
| 2026-04-05 00:00 |
09:21:03.21 |
+25:01:28.4 |
HIP 45869 |
8.50 |
| 2026-04-05 12:00 |
09:20:55.75 |
+25:01:34.6 |
HIP 45869 |
8.89 |
| 2026-04-06 00:00 |
09:20:48.48 |
+25:01:39.7 |
HIP 45869 |
9.56 |
| 2026-04-06 12:00 |
09:20:41.40 |
+25:01:43.8 |
HIP 45869 |
10.44 |
| 2026-04-07 00:00 |
09:20:34.51 |
+25:01:46.9 |
HIP 45869 |
11.45 |
| 2026-04-07 12:00 |
09:20:27.81 |
+25:01:49.0 |
HIP 45869 |
12.56 |
| 2026-04-08 00:00 |
09:20:21.30 |
+25:01:50.1 |
HIP 45869 |
13.71 |
| 2026-04-08 12:00 |
09:20:14.98 |
+25:01:50.1 |
HIP 45739 |
13.66 |
| 2026-04-09 00:00 |
09:20:08.85 |
+25:01:49.2 |
HIP 45739 |
12.67 |
| 2026-04-09 12:00 |
09:20:02.91 |
+25:01:47.2 |
HIP 45739 |
11.80 |
| 2026-04-10 00:00 |
09:19:57.16 |
+25:01:44.3 |
HIP 45739 |
11.07 |
| 2026-04-10 12:00 |
09:19:51.60 |
+25:01:40.4 |
HIP 45739 |
10.48 |
| 2026-04-11 00:00 |
09:19:46.24 |
+25:01:35.5 |
HIP 45739 |
10.05 |
| 2026-04-11 12:00 |
09:19:41.06 |
+25:01:29.7 |
HIP 45739 |
9.78 |
| 2026-04-12 00:00 |
09:19:36.08 |
+25:01:22.8 |
HIP 45739 |
9.67 |
| 2026-04-12 12:00 |
09:19:31.29 |
+25:01:15.0 |
HIP 45739 |
9.71 |
| 2026-04-13 00:00 |
09:19:26.70 |
+25:01:06.3 |
HIP 45739 |
9.88 |
| 2026-04-13 12:00 |
09:19:22.29 |
+25:00:56.6 |
HIP 45739 |
10.16 |
| 2026-04-14 00:00 |
09:19:18.08 |
+25:00:45.9 |
HIP 45739 |
10.54 |
| 2026-04-14 12:00 |
09:19:14.06 |
+25:00:34.3 |
HIP 45739 |
11.00 |
| 2026-04-15 00:00 |
09:19:10.24 |
+25:00:21.8 |
HIP 45739 |
11.50 |
| 2026-04-15 12:00 |
09:19:06.60 |
+25:00:08.3 |
HIP 45739 |
12.05 |
| 2026-04-16 00:00 |
09:19:03.16 |
+24:59:53.9 |
HIP 45739 |
12.62 |