| Parameter |
Value |
| Designation |
497P/Spacewatch-PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2011-12-07T03:44:27.081600Z |
| Orbit solution date (soln_date, UTC) |
2025-04-17T11:12:20Z |
| Obs used |
174 |
| NEO |
- |
| M1 |
8.800 |
| K1 |
32.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2024-10-05T07:22:55.862400Z |
| Discovery magnitude (MPC) |
21.76 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-05-28.0000000 |
| e |
0.63206766 |
| q (au) |
2.055492 |
| a (au) |
5.586604 |
| i (deg) |
10.531278 |
| Ω (om, deg) |
40.651360 |
| ω (w, deg) |
32.434528 |
| M (ma, deg) |
67.389928 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.595 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.595 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.970 |
| δ90 |
1.000 |
| 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 |
11:33:17.17 |
+10:16:47.9 |
HIP 56491 |
27.31 |
| 2026-06-01 12:00 |
11:33:23.84 |
+10:14:45.6 |
HIP 56491 |
24.86 |
| 2026-06-02 00:00 |
11:33:30.70 |
+10:12:42.5 |
HIP 56491 |
22.40 |
| 2026-06-02 12:00 |
11:33:37.74 |
+10:10:38.4 |
HIP 56491 |
19.94 |
| 2026-06-03 00:00 |
11:33:44.96 |
+10:08:33.6 |
HIP 56491 |
17.51 |
| 2026-06-03 12:00 |
11:33:52.36 |
+10:06:27.8 |
HIP 56491 |
15.14 |
| 2026-06-04 00:00 |
11:33:59.95 |
+10:04:21.3 |
HIP 56491 |
12.87 |
| 2026-06-04 12:00 |
11:34:07.71 |
+10:02:13.9 |
HIP 56491 |
10.83 |
| 2026-06-05 00:00 |
11:34:15.64 |
+10:00:05.6 |
HIP 56491 |
9.19 |
| 2026-06-05 12:00 |
11:34:23.76 |
+09:57:56.6 |
HIP 56491 |
8.24 |
| 2026-06-06 00:00 |
11:34:32.05 |
+09:55:46.8 |
HIP 56491 |
8.27 |
| 2026-06-06 12:00 |
11:34:40.51 |
+09:53:36.1 |
HIP 56491 |
9.30 |
| 2026-06-07 00:00 |
11:34:49.15 |
+09:51:24.7 |
HIP 56491 |
11.09 |
| 2026-06-07 12:00 |
11:34:57.95 |
+09:49:12.4 |
HIP 56491 |
13.37 |
| 2026-06-08 00:00 |
11:35:06.93 |
+09:46:59.4 |
HIP 56542 |
14.30 |
| 2026-06-08 12:00 |
11:35:16.08 |
+09:44:45.6 |
HIP 56542 |
11.24 |
| 2026-06-09 00:00 |
11:35:25.40 |
+09:42:31.0 |
HIP 56542 |
8.24 |
| 2026-06-09 12:00 |
11:35:34.88 |
+09:40:15.7 |
HIP 56542 |
5.46 |
| 2026-06-10 00:00 |
11:35:44.54 |
+09:37:59.6 |
HIP 56542 |
3.61 |
| 2026-06-10 12:00 |
11:35:54.35 |
+09:35:42.8 |
HIP 56542 |
4.25 |
| 2026-06-11 00:00 |
11:36:04.33 |
+09:33:25.2 |
HIP 56542 |
6.77 |
| 2026-06-11 12:00 |
11:36:14.48 |
+09:31:06.9 |
HIP 56542 |
9.85 |
| 2026-06-12 00:00 |
11:36:24.79 |
+09:28:47.8 |
HIP 56542 |
13.13 |
| 2026-06-12 12:00 |
11:36:35.25 |
+09:26:28.0 |
HIP 56663 |
14.89 |
| 2026-06-13 00:00 |
11:36:45.88 |
+09:24:07.5 |
HIP 56663 |
15.93 |
| 2026-06-13 12:00 |
11:36:56.67 |
+09:21:46.3 |
HIP 56663 |
17.62 |
| 2026-06-14 00:00 |
11:37:07.62 |
+09:19:24.4 |
HIP 56663 |
19.83 |
| 2026-06-14 12:00 |
11:37:18.72 |
+09:17:01.8 |
HIP 56663 |
22.41 |
| 2026-06-15 00:00 |
11:37:29.98 |
+09:14:38.5 |
HIP 56756 |
23.75 |
| 2026-06-15 12:00 |
11:37:41.40 |
+09:12:14.6 |
HIP 56756 |
20.46 |
| 2026-06-16 00:00 |
11:37:52.97 |
+09:09:49.9 |
HIP 56756 |
17.32 |
| 2026-06-16 12:00 |
11:38:04.69 |
+09:07:24.6 |
HIP 56756 |
14.44 |
| 2026-06-17 00:00 |
11:38:16.56 |
+09:04:58.6 |
HIP 56756 |
12.06 |
| 2026-06-17 12:00 |
11:38:28.58 |
+09:02:32.0 |
HIP 56756 |
10.57 |
| 2026-06-18 00:00 |
11:38:40.75 |
+09:00:04.7 |
HIP 56756 |
10.39 |
| 2026-06-18 12:00 |
11:38:53.07 |
+08:57:36.8 |
HIP 56756 |
11.61 |
| 2026-06-19 00:00 |
11:39:05.53 |
+08:55:08.2 |
HIP 56756 |
13.91 |
| 2026-06-19 12:00 |
11:39:18.14 |
+08:52:39.1 |
HIP 56756 |
16.87 |
| 2026-06-20 00:00 |
11:39:30.90 |
+08:50:09.3 |
HIP 56968 |
20.04 |
| 2026-06-20 12:00 |
11:39:43.79 |
+08:47:38.9 |
HIP 56968 |
16.04 |
| 2026-06-21 00:00 |
11:39:56.83 |
+08:45:08.0 |
HIP 56968 |
12.05 |
| 2026-06-21 12:00 |
11:40:10.01 |
+08:42:36.4 |
HIP 56968 |
8.13 |
| 2026-06-22 00:00 |
11:40:23.32 |
+08:40:04.3 |
HIP 56968 |
4.52 |