| Parameter |
Value |
| Designation |
508P/McNaught |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-01-15T03:13:20.297280Z |
| Orbit solution date (soln_date, UTC) |
2026-03-12T02:49:59Z |
| Obs used |
115 |
| NEO |
- |
| M1 |
14.400 |
| K1 |
23.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2005-05-03T17:19:54.624000Z |
| Discovery magnitude (MPC) |
17.60 T |
| Discovery observatory (MPC) |
E12 · Siding Spring Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2008-12-17.0000000 |
| e |
0.57045556 |
| q (au) |
1.533483 |
| a (au) |
3.570023 |
| i (deg) |
31.765073 |
| Ω (om, deg) |
268.821639 |
| ω (w, deg) |
339.031332 |
| M (ma, deg) |
195.746050 |
Magnitude
Scatter + Global Linear
$$
M_a = (19.357 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
19.357 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
10.000 |
| 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) |
| 2026-06-01 00:00 |
00:28:24.93 |
+32:52:39.9 |
HIP 2324 |
16.89 |
| 2026-06-01 12:00 |
00:28:55.23 |
+32:58:23.2 |
HIP 2324 |
9.24 |
| 2026-06-02 00:00 |
00:29:25.37 |
+33:04:06.2 |
HIP 2324 |
5.66 |
| 2026-06-02 12:00 |
00:29:55.36 |
+33:09:48.7 |
HIP 2324 |
11.12 |
| 2026-06-03 00:00 |
00:30:25.19 |
+33:15:30.9 |
HIP 2324 |
18.93 |
| 2026-06-03 12:00 |
00:30:54.86 |
+33:21:12.7 |
HIP 2475 |
15.12 |
| 2026-06-04 00:00 |
00:31:24.38 |
+33:26:54.1 |
HIP 2475 |
8.00 |
| 2026-06-04 12:00 |
00:31:53.73 |
+33:32:35.1 |
HIP 2475 |
6.30 |
| 2026-06-05 00:00 |
00:32:22.91 |
+33:38:15.6 |
HIP 2545 |
11.11 |
| 2026-06-05 12:00 |
00:32:51.94 |
+33:43:55.8 |
HIP 2603 |
7.24 |
| 2026-06-06 00:00 |
00:33:20.80 |
+33:49:35.5 |
HIP 2603 |
3.80 |
| 2026-06-06 12:00 |
00:33:49.49 |
+33:55:14.8 |
HIP 2603 |
10.57 |
| 2026-06-07 00:00 |
00:34:18.02 |
+34:00:53.7 |
HIP 2603 |
18.50 |
| 2026-06-07 12:00 |
00:34:46.37 |
+34:06:32.2 |
HIP 2801 |
24.80 |
| 2026-06-08 00:00 |
00:35:14.56 |
+34:12:10.3 |
HIP 2801 |
17.38 |
| 2026-06-08 12:00 |
00:35:42.58 |
+34:17:47.9 |
HIP 2801 |
11.00 |
| 2026-06-09 00:00 |
00:36:10.42 |
+34:23:25.1 |
HIP 2801 |
8.33 |
| 2026-06-09 12:00 |
00:36:38.09 |
+34:29:01.8 |
HIP 2823 |
11.77 |
| 2026-06-10 00:00 |
00:37:05.58 |
+34:34:38.1 |
HIP 2823 |
15.19 |
| 2026-06-10 12:00 |
00:37:32.90 |
+34:40:13.9 |
HIP 2823 |
21.17 |
| 2026-06-11 00:00 |
00:38:00.03 |
+34:45:49.3 |
HIP 2823 |
28.08 |
| 2026-06-11 12:00 |
00:38:26.99 |
+34:51:24.2 |
HIP 3074 |
32.97 |
| 2026-06-12 00:00 |
00:38:53.77 |
+34:56:58.7 |
HIP 2942 |
32.96 |
| 2026-06-12 12:00 |
00:39:20.36 |
+35:02:32.6 |
HIP 2942 |
32.42 |
| 2026-06-13 00:00 |
00:39:46.77 |
+35:08:06.1 |
HIP 2942 |
33.68 |
| 2026-06-13 12:00 |
00:40:12.99 |
+35:13:39.1 |
HIP 2942 |
36.53 |
| 2026-06-14 00:00 |
00:40:39.03 |
+35:19:11.6 |
HIP 3362 |
29.65 |
| 2026-06-14 12:00 |
00:41:04.87 |
+35:24:43.6 |
HIP 3362 |
22.55 |
| 2026-06-15 00:00 |
00:41:30.53 |
+35:30:15.1 |
HIP 3362 |
16.00 |
| 2026-06-15 12:00 |
00:41:55.99 |
+35:35:46.1 |
HIP 3362 |
10.97 |
| 2026-06-16 00:00 |
00:42:21.26 |
+35:41:16.5 |
HIP 3362 |
9.98 |
| 2026-06-16 12:00 |
00:42:46.34 |
+35:46:46.4 |
HIP 3362 |
13.86 |
| 2026-06-17 00:00 |
00:43:11.21 |
+35:52:15.8 |
HIP 3362 |
19.91 |
| 2026-06-17 12:00 |
00:43:35.89 |
+35:57:44.7 |
HIP 3362 |
26.66 |
| 2026-06-18 00:00 |
00:44:00.37 |
+36:03:12.9 |
HIP 3362 |
33.66 |
| 2026-06-18 12:00 |
00:44:24.65 |
+36:08:40.6 |
HIP 3498 |
27.63 |
| 2026-06-19 00:00 |
00:44:48.73 |
+36:14:07.8 |
HIP 3498 |
22.11 |
| 2026-06-19 12:00 |
00:45:12.60 |
+36:19:34.4 |
HIP 3498 |
17.90 |
| 2026-06-20 00:00 |
00:45:36.27 |
+36:25:00.4 |
HIP 3498 |
16.02 |
| 2026-06-20 12:00 |
00:45:59.74 |
+36:30:25.8 |
HIP 3498 |
17.19 |
| 2026-06-21 00:00 |
00:46:22.99 |
+36:35:50.6 |
HIP 3740 |
20.68 |
| 2026-06-21 12:00 |
00:46:46.04 |
+36:41:14.9 |
HIP 3740 |
19.19 |
| 2026-06-22 00:00 |
00:47:08.88 |
+36:46:38.5 |
HIP 3740 |
20.27 |