| 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) |
| 2026-09-20 00:00 |
12:43:06.07 |
-00:11:59.0 |
HIP 61992 |
13.74 |
| 2026-09-20 12:00 |
12:43:30.63 |
-00:14:58.7 |
HIP 61992 |
18.58 |
| 2026-09-21 00:00 |
12:43:55.21 |
-00:17:58.1 |
HIP 61992 |
24.39 |
| 2026-09-21 12:00 |
12:44:19.78 |
-00:20:57.4 |
HIP 61992 |
30.63 |
| 2026-09-22 00:00 |
12:44:44.36 |
-00:23:56.5 |
HIP 62238 |
32.82 |
| 2026-09-22 12:00 |
12:45:08.94 |
-00:26:55.3 |
HIP 62348 |
30.59 |
| 2026-09-23 00:00 |
12:45:33.52 |
-00:29:53.9 |
HIP 62348 |
24.35 |
| 2026-09-23 12:00 |
12:45:58.10 |
-00:32:52.3 |
HIP 62348 |
18.52 |
| 2026-09-24 00:00 |
12:46:22.69 |
-00:35:50.5 |
HIP 62348 |
13.67 |
| 2026-09-24 12:00 |
12:46:47.27 |
-00:38:48.4 |
HIP 62348 |
11.13 |
| 2026-09-25 00:00 |
12:47:11.86 |
-00:41:46.2 |
HIP 62348 |
12.41 |
| 2026-09-25 12:00 |
12:47:36.44 |
-00:44:43.6 |
HIP 62348 |
16.65 |
| 2026-09-26 00:00 |
12:48:01.02 |
-00:47:40.9 |
HIP 62348 |
22.21 |
| 2026-09-26 12:00 |
12:48:25.60 |
-00:50:37.9 |
HIP 62348 |
28.33 |
| 2026-09-27 00:00 |
12:48:50.18 |
-00:53:34.7 |
HIP 62687 |
29.34 |
| 2026-09-27 12:00 |
12:49:14.76 |
-00:56:31.2 |
HIP 62687 |
24.56 |
| 2026-09-28 00:00 |
12:49:39.34 |
-00:59:27.5 |
HIP 62687 |
20.93 |
| 2026-09-28 12:00 |
12:50:03.91 |
-01:02:23.6 |
HIP 62687 |
19.13 |
| 2026-09-29 00:00 |
12:50:28.47 |
-01:05:19.4 |
HIP 62687 |
19.66 |
| 2026-09-29 12:00 |
12:50:53.04 |
-01:08:14.9 |
HIP 62687 |
22.34 |
| 2026-09-30 00:00 |
12:51:17.60 |
-01:11:10.2 |
HIP 62808 |
20.60 |
| 2026-09-30 12:00 |
12:51:42.15 |
-01:14:05.2 |
HIP 62808 |
19.82 |
| 2026-10-01 00:00 |
12:52:06.70 |
-01:17:00.0 |
HIP 62808 |
21.30 |
| 2026-10-01 12:00 |
12:52:31.25 |
-01:19:54.5 |
HIP 62808 |
24.63 |
| 2026-10-02 00:00 |
12:52:55.78 |
-01:22:48.7 |
HIP 62963 |
18.96 |
| 2026-10-02 12:00 |
12:53:20.31 |
-01:25:42.7 |
HIP 62963 |
12.30 |
| 2026-10-03 00:00 |
12:53:44.84 |
-01:28:36.4 |
HIP 62963 |
5.91 |
| 2026-10-03 12:00 |
12:54:09.35 |
-01:31:29.8 |
HIP 62963 |
3.22 |
| 2026-10-04 00:00 |
12:54:33.86 |
-01:34:22.9 |
HIP 62963 |
8.81 |
| 2026-10-04 12:00 |
12:54:58.36 |
-01:37:15.8 |
HIP 63098 |
12.09 |
| 2026-10-05 00:00 |
12:55:22.84 |
-01:40:08.3 |
HIP 63098 |
5.37 |
| 2026-10-05 12:00 |
12:55:47.32 |
-01:43:00.6 |
HIP 63098 |
1.71 |
| 2026-10-06 00:00 |
12:56:11.79 |
-01:45:52.6 |
HIP 63098 |
8.27 |
| 2026-10-06 12:00 |
12:56:36.25 |
-01:48:44.2 |
HIP 63098 |
14.99 |
| 2026-10-07 00:00 |
12:57:00.69 |
-01:51:35.6 |
HIP 63269 |
17.68 |
| 2026-10-07 12:00 |
12:57:25.13 |
-01:54:26.6 |
HIP 63269 |
11.35 |
| 2026-10-08 00:00 |
12:57:49.55 |
-01:57:17.4 |
HIP 63269 |
6.00 |
| 2026-10-08 12:00 |
12:58:13.95 |
-02:00:07.8 |
HIP 63269 |
5.81 |
| 2026-10-09 00:00 |
12:58:38.34 |
-02:02:57.9 |
HIP 63361 |
5.62 |
| 2026-10-09 12:00 |
12:59:02.72 |
-02:05:47.7 |
HIP 63361 |
1.21 |
| 2026-10-10 00:00 |
12:59:27.08 |
-02:08:37.1 |
HIP 63361 |
7.84 |
| 2026-10-10 12:00 |
12:59:51.43 |
-02:11:26.2 |
HIP 63361 |
14.53 |
| 2026-10-11 00:00 |
13:00:15.75 |
-02:14:15.0 |
HIP 63496 |
20.35 |