| 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) |
| 2026-07-29 00:00 |
12:02:00.75 |
+05:12:07.4 |
HIP 58536 |
28.16 |
| 2026-07-29 12:00 |
12:02:21.62 |
+05:09:07.1 |
HIP 58809 |
31.93 |
| 2026-07-30 00:00 |
12:02:42.56 |
+05:06:06.7 |
HIP 58866 |
26.05 |
| 2026-07-30 12:00 |
12:03:03.57 |
+05:03:06.0 |
HIP 58866 |
20.07 |
| 2026-07-31 00:00 |
12:03:24.64 |
+05:00:05.2 |
HIP 58866 |
14.13 |
| 2026-07-31 12:00 |
12:03:45.78 |
+04:57:04.2 |
HIP 58866 |
8.31 |
| 2026-08-01 00:00 |
12:04:06.98 |
+04:54:03.1 |
HIP 58866 |
3.49 |
| 2026-08-01 12:00 |
12:04:28.25 |
+04:51:01.7 |
HIP 58866 |
5.42 |
| 2026-08-02 00:00 |
12:04:49.57 |
+04:48:00.2 |
HIP 58871 |
7.94 |
| 2026-08-02 12:00 |
12:05:10.97 |
+04:44:58.5 |
HIP 58871 |
11.60 |
| 2026-08-03 00:00 |
12:05:32.42 |
+04:41:56.7 |
HIP 58871 |
16.79 |
| 2026-08-03 12:00 |
12:05:53.94 |
+04:38:54.7 |
HIP 58871 |
22.48 |
| 2026-08-04 00:00 |
12:06:15.52 |
+04:35:52.5 |
HIP 59134 |
19.93 |
| 2026-08-04 12:00 |
12:06:37.15 |
+04:32:50.2 |
HIP 59134 |
14.03 |
| 2026-08-05 00:00 |
12:06:58.85 |
+04:29:47.7 |
HIP 59134 |
8.53 |
| 2026-08-05 12:00 |
12:07:20.61 |
+04:26:45.1 |
HIP 59134 |
5.06 |
| 2026-08-06 00:00 |
12:07:42.42 |
+04:23:42.3 |
HIP 59134 |
7.48 |
| 2026-08-06 12:00 |
12:08:04.29 |
+04:20:39.4 |
HIP 59134 |
12.81 |
| 2026-08-07 00:00 |
12:08:26.23 |
+04:17:36.4 |
HIP 59134 |
18.73 |
| 2026-08-07 12:00 |
12:08:48.21 |
+04:14:33.2 |
HIP 59321 |
21.17 |
| 2026-08-08 00:00 |
12:09:10.26 |
+04:11:29.9 |
HIP 59321 |
16.83 |
| 2026-08-08 12:00 |
12:09:32.36 |
+04:08:26.5 |
HIP 59321 |
14.05 |
| 2026-08-09 00:00 |
12:09:54.51 |
+04:05:22.9 |
HIP 59321 |
13.82 |
| 2026-08-09 12:00 |
12:10:16.72 |
+04:02:19.3 |
HIP 59321 |
16.25 |
| 2026-08-10 00:00 |
12:10:38.98 |
+03:59:15.5 |
HIP 59451 |
15.82 |
| 2026-08-10 12:00 |
12:11:01.30 |
+03:56:11.6 |
HIP 59451 |
12.07 |
| 2026-08-11 00:00 |
12:11:23.66 |
+03:53:07.6 |
HIP 59451 |
11.03 |
| 2026-08-11 12:00 |
12:11:46.08 |
+03:50:03.5 |
HIP 59451 |
13.37 |
| 2026-08-12 00:00 |
12:12:08.55 |
+03:46:59.3 |
HIP 59451 |
17.82 |
| 2026-08-12 12:00 |
12:12:31.07 |
+03:43:55.0 |
HIP 59536 |
19.68 |
| 2026-08-13 00:00 |
12:12:53.64 |
+03:40:50.6 |
HIP 59536 |
17.62 |
| 2026-08-13 12:00 |
12:13:16.26 |
+03:37:46.2 |
HIP 59536 |
17.79 |
| 2026-08-14 00:00 |
12:13:38.93 |
+03:34:41.6 |
HIP 59536 |
20.13 |
| 2026-08-14 12:00 |
12:14:01.64 |
+03:31:37.0 |
HIP 59536 |
24.04 |
| 2026-08-15 00:00 |
12:14:24.40 |
+03:28:32.4 |
HIP 59829 |
26.15 |
| 2026-08-15 12:00 |
12:14:47.21 |
+03:25:27.6 |
HIP 59829 |
21.56 |
| 2026-08-16 00:00 |
12:15:10.06 |
+03:22:22.8 |
HIP 59829 |
18.15 |
| 2026-08-16 12:00 |
12:15:32.96 |
+03:19:18.0 |
HIP 59829 |
16.66 |
| 2026-08-17 00:00 |
12:15:55.90 |
+03:16:13.1 |
HIP 59829 |
17.61 |
| 2026-08-17 12:00 |
12:16:18.88 |
+03:13:08.1 |
HIP 59829 |
20.67 |
| 2026-08-18 00:00 |
12:16:41.90 |
+03:10:03.2 |
HIP 59918 |
20.32 |
| 2026-08-18 12:00 |
12:17:04.97 |
+03:06:58.1 |
HIP 59918 |
14.83 |
| 2026-08-19 00:00 |
12:17:28.07 |
+03:03:53.1 |
HIP 59918 |
10.60 |