| 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) |
| 2026-06-01 00:00 |
18:25:43.47 |
-08:52:22.6 |
HIP 90436 |
21.06 |
| 2026-06-01 12:00 |
18:25:31.48 |
-08:52:18.4 |
HIP 90436 |
24.02 |
| 2026-06-02 00:00 |
18:25:19.39 |
-08:52:15.0 |
HIP 90135 |
24.95 |
| 2026-06-02 12:00 |
18:25:07.20 |
-08:52:12.4 |
HIP 90135 |
21.99 |
| 2026-06-03 00:00 |
18:24:54.92 |
-08:52:10.4 |
HIP 90135 |
19.02 |
| 2026-06-03 12:00 |
18:24:42.54 |
-08:52:09.2 |
HIP 90135 |
16.04 |
| 2026-06-04 00:00 |
18:24:30.07 |
-08:52:08.8 |
HIP 90135 |
13.08 |
| 2026-06-04 12:00 |
18:24:17.51 |
-08:52:09.1 |
HIP 90135 |
10.16 |
| 2026-06-05 00:00 |
18:24:04.86 |
-08:52:10.2 |
HIP 90135 |
7.37 |
| 2026-06-05 12:00 |
18:23:52.13 |
-08:52:12.0 |
HIP 90135 |
4.96 |
| 2026-06-06 00:00 |
18:23:39.31 |
-08:52:14.5 |
HIP 90135 |
3.83 |
| 2026-06-06 12:00 |
18:23:26.41 |
-08:52:17.8 |
HIP 90135 |
4.98 |
| 2026-06-07 00:00 |
18:23:13.43 |
-08:52:21.9 |
HIP 90135 |
7.44 |
| 2026-06-07 12:00 |
18:23:00.37 |
-08:52:26.7 |
HIP 90135 |
10.33 |
| 2026-06-08 00:00 |
18:22:47.24 |
-08:52:32.2 |
HIP 90135 |
13.40 |
| 2026-06-08 12:00 |
18:22:34.03 |
-08:52:38.6 |
HIP 90135 |
16.54 |
| 2026-06-09 00:00 |
18:22:20.75 |
-08:52:45.7 |
HIP 90135 |
19.74 |
| 2026-06-09 12:00 |
18:22:07.40 |
-08:52:53.5 |
HIP 90135 |
22.98 |
| 2026-06-10 00:00 |
18:21:53.99 |
-08:53:02.1 |
HIP 90135 |
26.25 |
| 2026-06-10 12:00 |
18:21:40.51 |
-08:53:11.5 |
HIP 90135 |
29.54 |
| 2026-06-11 00:00 |
18:21:26.96 |
-08:53:21.6 |
HIP 90135 |
32.86 |
| 2026-06-11 12:00 |
18:21:13.36 |
-08:53:32.5 |
HIP 90135 |
36.20 |
| 2026-06-12 00:00 |
18:20:59.70 |
-08:53:44.2 |
HIP 89973 |
37.36 |
| 2026-06-12 12:00 |
18:20:45.98 |
-08:53:56.6 |
HIP 89973 |
38.31 |
| 2026-06-13 00:00 |
18:20:32.21 |
-08:54:09.8 |
HIP 89686 |
39.01 |
| 2026-06-13 12:00 |
18:20:18.38 |
-08:54:23.8 |
HIP 89686 |
36.03 |
| 2026-06-14 00:00 |
18:20:04.51 |
-08:54:38.5 |
HIP 89686 |
33.14 |
| 2026-06-14 12:00 |
18:19:50.60 |
-08:54:54.0 |
HIP 89686 |
30.36 |
| 2026-06-15 00:00 |
18:19:36.64 |
-08:55:10.3 |
HIP 89686 |
27.72 |
| 2026-06-15 12:00 |
18:19:22.63 |
-08:55:27.4 |
HIP 89686 |
25.29 |
| 2026-06-16 00:00 |
18:19:08.59 |
-08:55:45.2 |
HIP 89686 |
23.13 |
| 2026-06-16 12:00 |
18:18:54.52 |
-08:56:03.7 |
HIP 89686 |
21.33 |
| 2026-06-17 00:00 |
18:18:40.41 |
-08:56:23.1 |
HIP 89686 |
19.99 |
| 2026-06-17 12:00 |
18:18:26.27 |
-08:56:43.2 |
HIP 89686 |
19.21 |
| 2026-06-18 00:00 |
18:18:12.10 |
-08:57:04.0 |
HIP 89686 |
19.07 |
| 2026-06-18 12:00 |
18:17:57.90 |
-08:57:25.6 |
HIP 89686 |
19.58 |
| 2026-06-19 00:00 |
18:17:43.69 |
-08:57:48.0 |
HIP 89686 |
20.71 |
| 2026-06-19 12:00 |
18:17:29.45 |
-08:58:11.1 |
HIP 89686 |
22.35 |
| 2026-06-20 00:00 |
18:17:15.19 |
-08:58:35.0 |
HIP 89646 |
24.22 |
| 2026-06-20 12:00 |
18:17:00.92 |
-08:58:59.6 |
HIP 89646 |
24.93 |
| 2026-06-21 00:00 |
18:16:46.63 |
-08:59:25.0 |
HIP 89646 |
26.10 |
| 2026-06-21 12:00 |
18:16:32.33 |
-08:59:51.1 |
HIP 89646 |
27.67 |
| 2026-06-22 00:00 |
18:16:18.03 |
-09:00:17.9 |
HIP 89646 |
29.58 |