| Parameter |
Value |
| Designation |
494P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-05-31T00:08:54.064320Z |
| Orbit solution date (soln_date, UTC) |
2024-12-14T13:27:26Z |
| Obs used |
62 |
| NEO |
- |
| M1 |
15.900 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2010-10-08T09:52:34.550400Z |
| Discovery magnitude (MPC) |
23.38 G |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2023-05-16.0000000 |
| e |
0.35748875 |
| q (au) |
2.440228 |
| a (au) |
3.797954 |
| i (deg) |
7.788642 |
| Ω (om, deg) |
245.048909 |
| ω (w, deg) |
48.878232 |
| M (ma, deg) |
309.264539 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.901 + 5.392\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.901 |
| n |
5.392 |
| gf |
1.000 |
| gb |
-0.718 |
| 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 |
04:24:13.47 |
+21:22:02.6 |
HIP 20480 |
11.94 |
| 2026-06-01 12:00 |
04:24:46.08 |
+21:22:58.1 |
HIP 20480 |
19.51 |
| 2026-06-02 00:00 |
04:25:18.67 |
+21:23:53.1 |
HIP 20712 |
14.57 |
| 2026-06-02 12:00 |
04:25:51.24 |
+21:24:47.7 |
HIP 20712 |
7.20 |
| 2026-06-03 00:00 |
04:26:23.81 |
+21:25:41.9 |
HIP 20712 |
2.83 |
| 2026-06-03 12:00 |
04:26:56.35 |
+21:26:35.6 |
HIP 20712 |
8.97 |
| 2026-06-04 00:00 |
04:27:28.89 |
+21:27:28.8 |
HIP 20842 |
12.22 |
| 2026-06-04 12:00 |
04:28:01.40 |
+21:28:21.6 |
HIP 20842 |
8.84 |
| 2026-06-05 00:00 |
04:28:33.90 |
+21:29:14.0 |
HIP 20842 |
11.09 |
| 2026-06-05 12:00 |
04:29:06.39 |
+21:30:05.9 |
HIP 20842 |
16.84 |
| 2026-06-06 00:00 |
04:29:38.85 |
+21:30:57.3 |
HIP 20842 |
23.65 |
| 2026-06-06 12:00 |
04:30:11.30 |
+21:31:48.3 |
HIP 21158 |
27.79 |
| 2026-06-07 00:00 |
04:30:43.73 |
+21:32:38.9 |
HIP 21158 |
20.27 |
| 2026-06-07 12:00 |
04:31:16.14 |
+21:33:29.0 |
HIP 21158 |
12.83 |
| 2026-06-08 00:00 |
04:31:48.53 |
+21:34:18.6 |
HIP 21158 |
5.79 |
| 2026-06-08 12:00 |
04:32:20.90 |
+21:35:07.7 |
HIP 21158 |
4.13 |
| 2026-06-09 00:00 |
04:32:53.24 |
+21:35:56.4 |
HIP 21158 |
10.73 |
| 2026-06-09 12:00 |
04:33:25.57 |
+21:36:44.7 |
HIP 21158 |
18.09 |
| 2026-06-10 00:00 |
04:33:57.87 |
+21:37:32.4 |
HIP 21158 |
25.56 |
| 2026-06-10 12:00 |
04:34:30.15 |
+21:38:19.8 |
HIP 21436 |
24.89 |
| 2026-06-11 00:00 |
04:35:02.41 |
+21:39:06.6 |
HIP 21442 |
17.61 |
| 2026-06-11 12:00 |
04:35:34.64 |
+21:39:53.0 |
HIP 21442 |
10.08 |
| 2026-06-12 00:00 |
04:36:06.84 |
+21:40:38.9 |
HIP 21442 |
2.59 |
| 2026-06-12 12:00 |
04:36:39.02 |
+21:41:24.3 |
HIP 21442 |
4.99 |
| 2026-06-13 00:00 |
04:37:11.18 |
+21:42:09.3 |
HIP 21442 |
12.48 |
| 2026-06-13 12:00 |
04:37:43.30 |
+21:42:53.7 |
HIP 21442 |
19.97 |
| 2026-06-14 00:00 |
04:38:15.40 |
+21:43:37.8 |
HIP 21706 |
23.08 |
| 2026-06-14 12:00 |
04:38:47.46 |
+21:44:21.3 |
HIP 21706 |
17.85 |
| 2026-06-15 00:00 |
04:39:19.50 |
+21:45:04.4 |
HIP 21706 |
14.71 |
| 2026-06-15 12:00 |
04:39:51.51 |
+21:45:46.9 |
HIP 21706 |
15.03 |
| 2026-06-16 00:00 |
04:40:23.48 |
+21:46:29.0 |
HIP 21706 |
18.62 |
| 2026-06-16 12:00 |
04:40:55.42 |
+21:47:10.7 |
HIP 21856 |
22.35 |
| 2026-06-17 00:00 |
04:41:27.33 |
+21:47:51.8 |
HIP 21856 |
18.88 |
| 2026-06-17 12:00 |
04:41:59.20 |
+21:48:32.5 |
HIP 21856 |
18.00 |
| 2026-06-18 00:00 |
04:42:31.04 |
+21:49:12.7 |
HIP 21856 |
20.05 |
| 2026-06-18 12:00 |
04:43:02.85 |
+21:49:52.4 |
HIP 22042 |
21.29 |
| 2026-06-19 00:00 |
04:43:34.61 |
+21:50:31.6 |
HIP 22042 |
15.74 |
| 2026-06-19 12:00 |
04:44:06.34 |
+21:51:10.3 |
HIP 22042 |
12.32 |
| 2026-06-20 00:00 |
04:44:38.04 |
+21:51:48.6 |
HIP 22042 |
12.85 |
| 2026-06-20 12:00 |
04:45:09.69 |
+21:52:26.4 |
HIP 22042 |
16.94 |
| 2026-06-21 00:00 |
04:45:41.30 |
+21:53:03.7 |
HIP 22042 |
22.75 |
| 2026-06-21 12:00 |
04:46:12.88 |
+21:53:40.5 |
HIP 22118 |
27.40 |
| 2026-06-22 00:00 |
04:46:44.41 |
+21:54:16.8 |
HIP 22291 |
24.03 |