319P/Catalina-McNaught
| 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) |
| 2026-02-03 00:00 |
09:52:47.15 |
+22:35:50.9 |
HIP 48462 |
1.68 |
| 2026-02-03 12:00 |
09:52:28.99 |
+22:37:53.5 |
HIP 48462 |
5.22 |
| 2026-02-04 00:00 |
09:52:10.76 |
+22:39:55.8 |
HIP 48462 |
9.77 |
| 2026-02-04 12:00 |
09:51:52.47 |
+22:41:57.7 |
HIP 48462 |
14.41 |
| 2026-02-05 00:00 |
09:51:34.12 |
+22:43:59.2 |
HIP 48398 |
17.37 |
| 2026-02-05 12:00 |
09:51:15.71 |
+22:46:00.4 |
HIP 48398 |
17.66 |
| 2026-02-06 00:00 |
09:50:57.24 |
+22:48:01.1 |
HIP 48398 |
19.15 |
| 2026-02-06 12:00 |
09:50:38.72 |
+22:50:01.3 |
HIP 48398 |
21.59 |
| 2026-02-07 00:00 |
09:50:20.15 |
+22:52:01.1 |
HIP 48398 |
24.71 |
| 2026-02-07 12:00 |
09:50:01.54 |
+22:54:00.5 |
HIP 48144 |
23.59 |
| 2026-02-08 00:00 |
09:49:42.88 |
+22:55:59.3 |
HIP 48144 |
22.61 |
| 2026-02-08 12:00 |
09:49:24.17 |
+22:57:57.6 |
HIP 48144 |
22.59 |
| 2026-02-09 00:00 |
09:49:05.43 |
+22:59:55.5 |
HIP 48144 |
23.54 |
| 2026-02-09 12:00 |
09:48:46.65 |
+23:01:52.7 |
HIP 48144 |
25.35 |
| 2026-02-10 00:00 |
09:48:27.84 |
+23:03:49.5 |
HIP 48144 |
27.85 |
| 2026-02-10 12:00 |
09:48:09.00 |
+23:05:45.6 |
HIP 48144 |
30.87 |
| 2026-02-11 00:00 |
09:47:50.13 |
+23:07:41.2 |
HIP 48023 |
31.83 |
| 2026-02-11 12:00 |
09:47:31.23 |
+23:09:36.1 |
HIP 48023 |
29.33 |
| 2026-02-12 00:00 |
09:47:12.32 |
+23:11:30.4 |
HIP 48023 |
27.45 |
| 2026-02-12 12:00 |
09:46:53.38 |
+23:13:24.1 |
HIP 48023 |
26.30 |
| 2026-02-13 00:00 |
09:46:34.43 |
+23:15:17.2 |
HIP 47853 |
22.55 |
| 2026-02-13 12:00 |
09:46:15.47 |
+23:17:09.5 |
HIP 47853 |
17.95 |
| 2026-02-14 00:00 |
09:45:56.49 |
+23:19:01.2 |
HIP 47853 |
13.46 |
| 2026-02-14 12:00 |
09:45:37.51 |
+23:20:52.2 |
HIP 47853 |
9.23 |
| 2026-02-15 00:00 |
09:45:18.53 |
+23:22:42.5 |
HIP 47853 |
5.83 |
| 2026-02-15 12:00 |
09:44:59.54 |
+23:24:32.0 |
HIP 47853 |
5.26 |
| 2026-02-16 00:00 |
09:44:40.56 |
+23:26:20.8 |
HIP 47853 |
8.12 |
| 2026-02-16 12:00 |
09:44:21.58 |
+23:28:08.8 |
HIP 47853 |
12.20 |
| 2026-02-17 00:00 |
09:44:02.61 |
+23:29:56.1 |
HIP 47853 |
16.60 |
| 2026-02-17 12:00 |
09:43:43.65 |
+23:31:42.6 |
HIP 47644 |
13.15 |
| 2026-02-18 00:00 |
09:43:24.71 |
+23:33:28.2 |
HIP 47644 |
8.47 |
| 2026-02-18 12:00 |
09:43:05.78 |
+23:35:13.1 |
HIP 47644 |
3.82 |
| 2026-02-19 00:00 |
09:42:46.87 |
+23:36:57.1 |
HIP 47644 |
1.04 |
| 2026-02-19 12:00 |
09:42:27.99 |
+23:38:40.2 |
HIP 47644 |
5.56 |
| 2026-02-20 00:00 |
09:42:09.13 |
+23:40:22.5 |
HIP 47644 |
10.19 |
| 2026-02-20 12:00 |
09:41:50.31 |
+23:42:04.0 |
HIP 47644 |
14.82 |
| 2026-02-21 00:00 |
09:41:31.51 |
+23:43:44.5 |
HIP 47644 |
19.43 |
| 2026-02-21 12:00 |
09:41:12.75 |
+23:45:24.2 |
HIP 47644 |
24.03 |
| 2026-02-22 00:00 |
09:40:54.03 |
+23:47:02.9 |
HIP 47644 |
28.62 |
| 2026-02-22 12:00 |
09:40:35.36 |
+23:48:40.7 |
HIP 47644 |
33.19 |
| 2026-02-23 00:00 |
09:40:16.72 |
+23:50:17.6 |
HIP 47288 |
33.20 |
| 2026-02-23 12:00 |
09:39:58.13 |
+23:51:53.6 |
HIP 47258 |
30.37 |
| 2026-02-24 00:00 |
09:39:39.60 |
+23:53:28.6 |
HIP 47258 |
25.86 |