| 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) |
| 2026-05-12 00:00 |
04:02:25.01 |
+20:39:18.8 |
HIP 18792 |
12.16 |
| 2026-05-12 12:00 |
04:02:57.65 |
+20:40:30.6 |
HIP 19002 |
18.96 |
| 2026-05-13 00:00 |
04:03:30.31 |
+20:41:41.9 |
HIP 19002 |
11.36 |
| 2026-05-13 12:00 |
04:04:02.97 |
+20:42:52.9 |
HIP 19002 |
4.25 |
| 2026-05-14 00:00 |
04:04:35.65 |
+20:44:03.5 |
HIP 19002 |
5.16 |
| 2026-05-14 12:00 |
04:05:08.34 |
+20:45:13.8 |
HIP 19054 |
6.76 |
| 2026-05-15 00:00 |
04:05:41.04 |
+20:46:23.7 |
HIP 19146 |
9.57 |
| 2026-05-15 12:00 |
04:06:13.75 |
+20:47:33.2 |
HIP 19146 |
7.47 |
| 2026-05-16 00:00 |
04:06:46.47 |
+20:48:42.4 |
HIP 19146 |
11.82 |
| 2026-05-16 12:00 |
04:07:19.19 |
+20:49:51.2 |
HIP 19146 |
18.52 |
| 2026-05-17 00:00 |
04:07:51.92 |
+20:50:59.6 |
HIP 19262 |
24.86 |
| 2026-05-17 12:00 |
04:08:24.66 |
+20:52:07.6 |
HIP 19262 |
25.56 |
| 2026-05-18 00:00 |
04:08:57.40 |
+20:53:15.2 |
HIP 19262 |
28.42 |
| 2026-05-18 12:00 |
04:09:30.15 |
+20:54:22.5 |
HIP 19367 |
32.25 |
| 2026-05-19 00:00 |
04:10:02.90 |
+20:55:29.3 |
HIP 19616 |
32.19 |
| 2026-05-19 12:00 |
04:10:35.65 |
+20:56:35.8 |
HIP 19616 |
25.60 |
| 2026-05-20 00:00 |
04:11:08.41 |
+20:57:41.8 |
HIP 19616 |
19.86 |
| 2026-05-20 12:00 |
04:11:41.16 |
+20:58:47.5 |
HIP 19616 |
15.89 |
| 2026-05-21 00:00 |
04:12:13.92 |
+20:59:52.7 |
HIP 19616 |
15.17 |
| 2026-05-21 12:00 |
04:12:46.68 |
+21:00:57.6 |
HIP 19665 |
16.85 |
| 2026-05-22 00:00 |
04:13:19.44 |
+21:02:02.0 |
HIP 19665 |
19.38 |
| 2026-05-22 12:00 |
04:13:52.19 |
+21:03:06.1 |
HIP 19665 |
24.21 |
| 2026-05-23 00:00 |
04:14:24.94 |
+21:04:09.7 |
HIP 19870 |
23.47 |
| 2026-05-23 12:00 |
04:14:57.69 |
+21:05:12.9 |
HIP 19870 |
19.12 |
| 2026-05-24 00:00 |
04:15:30.44 |
+21:06:15.7 |
HIP 19870 |
17.29 |
| 2026-05-24 12:00 |
04:16:03.18 |
+21:07:18.1 |
HIP 19870 |
18.75 |
| 2026-05-25 00:00 |
04:16:35.92 |
+21:08:20.0 |
HIP 19870 |
22.86 |
| 2026-05-25 12:00 |
04:17:08.66 |
+21:09:21.6 |
HIP 20136 |
27.60 |
| 2026-05-26 00:00 |
04:17:41.38 |
+21:10:22.7 |
HIP 20136 |
20.08 |
| 2026-05-26 12:00 |
04:18:14.10 |
+21:11:23.4 |
HIP 20136 |
12.79 |
| 2026-05-27 00:00 |
04:18:46.82 |
+21:12:23.7 |
HIP 20136 |
6.50 |
| 2026-05-27 12:00 |
04:19:19.53 |
+21:13:23.5 |
HIP 20171 |
5.08 |
| 2026-05-28 00:00 |
04:19:52.23 |
+21:14:22.9 |
HIP 20171 |
8.44 |
| 2026-05-28 12:00 |
04:20:24.92 |
+21:15:21.9 |
HIP 20171 |
15.32 |
| 2026-05-29 00:00 |
04:20:57.60 |
+21:16:20.4 |
HIP 20349 |
16.04 |
| 2026-05-29 12:00 |
04:21:30.27 |
+21:17:18.6 |
HIP 20349 |
14.91 |
| 2026-05-30 00:00 |
04:22:02.93 |
+21:18:16.2 |
HIP 20349 |
17.47 |
| 2026-05-30 12:00 |
04:22:35.58 |
+21:19:13.5 |
HIP 20480 |
11.43 |
| 2026-05-31 00:00 |
04:23:08.23 |
+21:20:10.3 |
HIP 20480 |
4.16 |
| 2026-05-31 12:00 |
04:23:40.85 |
+21:21:06.7 |
HIP 20480 |
4.63 |
| 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 |