| Parameter |
Value |
| Designation |
475P/Spacewatch-LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2004-09-20T05:48:26.389440Z |
| Orbit solution date (soln_date, UTC) |
2025-06-26T10:13:27Z |
| Obs used |
159 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
15.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2023-11-11T05:51:29.030400Z |
| Discovery magnitude (MPC) |
20.80 G |
| Discovery observatory (MPC) |
J04 · ESA Optical Ground Station, Tenerife |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-08-10.0000000 |
| e |
0.43983107 |
| q (au) |
4.088003 |
| a (au) |
7.297804 |
| i (deg) |
14.525819 |
| Ω (om, deg) |
147.492673 |
| ω (w, deg) |
40.536988 |
| M (ma, deg) |
144.019928 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.697 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.697 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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) |
| 2026-09-20 00:00 |
17:59:58.03 |
-12:21:53.1 |
HIP 88117 |
13.06 |
| 2026-09-20 12:00 |
18:00:06.23 |
-12:23:08.7 |
HIP 88117 |
14.77 |
| 2026-09-21 00:00 |
18:00:14.58 |
-12:24:24.0 |
HIP 88117 |
16.65 |
| 2026-09-21 12:00 |
18:00:23.07 |
-12:25:39.1 |
HIP 88117 |
18.66 |
| 2026-09-22 00:00 |
18:00:31.72 |
-12:26:53.9 |
HIP 88117 |
20.77 |
| 2026-09-22 12:00 |
18:00:40.51 |
-12:28:08.5 |
HIP 88117 |
22.97 |
| 2026-09-23 00:00 |
18:00:49.46 |
-12:29:22.9 |
HIP 88326 |
24.88 |
| 2026-09-23 12:00 |
18:00:58.55 |
-12:30:36.9 |
HIP 88326 |
23.45 |
| 2026-09-24 00:00 |
18:01:07.79 |
-12:31:50.8 |
HIP 88326 |
22.20 |
| 2026-09-24 12:00 |
18:01:17.18 |
-12:33:04.3 |
HIP 88326 |
21.15 |
| 2026-09-25 00:00 |
18:01:26.71 |
-12:34:17.6 |
HIP 88326 |
20.36 |
| 2026-09-25 12:00 |
18:01:36.38 |
-12:35:30.6 |
HIP 88326 |
19.86 |
| 2026-09-26 00:00 |
18:01:46.20 |
-12:36:43.4 |
HIP 88326 |
19.69 |
| 2026-09-26 12:00 |
18:01:56.17 |
-12:37:55.8 |
HIP 88326 |
19.87 |
| 2026-09-27 00:00 |
18:02:06.27 |
-12:39:08.0 |
HIP 88326 |
20.41 |
| 2026-09-27 12:00 |
18:02:16.52 |
-12:40:19.9 |
HIP 88326 |
21.28 |
| 2026-09-28 00:00 |
18:02:26.92 |
-12:41:31.5 |
HIP 88462 |
19.05 |
| 2026-09-28 12:00 |
18:02:37.45 |
-12:42:42.8 |
HIP 88462 |
16.28 |
| 2026-09-29 00:00 |
18:02:48.12 |
-12:43:53.8 |
HIP 88462 |
13.50 |
| 2026-09-29 12:00 |
18:02:58.93 |
-12:45:04.5 |
HIP 88462 |
10.72 |
| 2026-09-30 00:00 |
18:03:09.89 |
-12:46:15.0 |
HIP 88462 |
8.00 |
| 2026-09-30 12:00 |
18:03:20.98 |
-12:47:25.1 |
HIP 88462 |
5.44 |
| 2026-10-01 00:00 |
18:03:32.20 |
-12:48:34.9 |
HIP 88462 |
3.52 |
| 2026-10-01 12:00 |
18:03:43.57 |
-12:49:44.4 |
HIP 88462 |
3.58 |
| 2026-10-02 00:00 |
18:03:55.07 |
-12:50:53.5 |
HIP 88462 |
5.61 |
| 2026-10-02 12:00 |
18:04:06.71 |
-12:52:02.4 |
HIP 88462 |
8.30 |
| 2026-10-03 00:00 |
18:04:18.49 |
-12:53:10.9 |
HIP 88462 |
11.20 |
| 2026-10-03 12:00 |
18:04:30.40 |
-12:54:19.1 |
HIP 88462 |
14.20 |
| 2026-10-04 00:00 |
18:04:42.44 |
-12:55:27.0 |
HIP 88462 |
17.27 |
| 2026-10-04 12:00 |
18:04:54.62 |
-12:56:34.6 |
HIP 88462 |
20.39 |
| 2026-10-05 00:00 |
18:05:06.93 |
-12:57:41.8 |
HIP 88462 |
23.55 |
| 2026-10-05 12:00 |
18:05:19.38 |
-12:58:48.6 |
HIP 88462 |
26.74 |
| 2026-10-06 00:00 |
18:05:31.95 |
-12:59:55.2 |
HIP 88748 |
26.20 |
| 2026-10-06 12:00 |
18:05:44.66 |
-13:01:01.3 |
HIP 88748 |
23.02 |
| 2026-10-07 00:00 |
18:05:57.50 |
-13:02:07.2 |
HIP 88748 |
19.84 |
| 2026-10-07 12:00 |
18:06:10.47 |
-13:03:12.6 |
HIP 88748 |
16.70 |
| 2026-10-08 00:00 |
18:06:23.57 |
-13:04:17.7 |
HIP 88748 |
13.64 |
| 2026-10-08 12:00 |
18:06:36.79 |
-13:05:22.5 |
HIP 88748 |
10.75 |
| 2026-10-09 00:00 |
18:06:50.15 |
-13:06:26.9 |
HIP 88748 |
8.25 |
| 2026-10-09 12:00 |
18:07:03.63 |
-13:07:30.9 |
HIP 88748 |
6.65 |
| 2026-10-10 00:00 |
18:07:17.24 |
-13:08:34.5 |
HIP 88748 |
6.66 |
| 2026-10-10 12:00 |
18:07:30.97 |
-13:09:37.8 |
HIP 88748 |
8.32 |
| 2026-10-11 00:00 |
18:07:44.83 |
-13:10:40.7 |
HIP 88748 |
10.92 |