475P/Spacewatch-LINEAR
| 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 |
0.999 |
| 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) |
| 2026-02-03 00:00 |
17:58:59.67 |
-11:40:13.1 |
HIP 88016 |
13.09 |
| 2026-02-03 12:00 |
17:59:23.64 |
-11:39:47.5 |
HIP 88016 |
16.49 |
| 2026-02-04 00:00 |
17:59:47.51 |
-11:39:21.3 |
HIP 88016 |
21.00 |
| 2026-02-04 12:00 |
18:00:11.28 |
-11:38:54.6 |
HIP 88158 |
23.43 |
| 2026-02-05 00:00 |
18:00:34.96 |
-11:38:27.3 |
HIP 88158 |
23.17 |
| 2026-02-05 12:00 |
18:00:58.54 |
-11:37:59.5 |
HIP 88158 |
24.32 |
| 2026-02-06 00:00 |
18:01:22.02 |
-11:37:31.1 |
HIP 88158 |
26.70 |
| 2026-02-06 12:00 |
18:01:45.40 |
-11:37:02.3 |
HIP 88158 |
29.98 |
| 2026-02-07 00:00 |
18:02:08.68 |
-11:36:32.9 |
HIP 88158 |
33.90 |
| 2026-02-07 12:00 |
18:02:31.86 |
-11:36:02.9 |
HIP 88158 |
38.26 |
| 2026-02-08 00:00 |
18:02:54.94 |
-11:35:32.5 |
HIP 88158 |
42.91 |
| 2026-02-08 12:00 |
18:03:17.92 |
-11:35:01.5 |
HIP 88502 |
43.21 |
| 2026-02-09 00:00 |
18:03:40.79 |
-11:34:30.1 |
HIP 88502 |
41.04 |
| 2026-02-09 12:00 |
18:04:03.56 |
-11:33:58.1 |
HIP 88608 |
39.19 |
| 2026-02-10 00:00 |
18:04:26.23 |
-11:33:25.6 |
HIP 88719 |
34.47 |
| 2026-02-10 12:00 |
18:04:48.78 |
-11:32:52.6 |
HIP 88719 |
28.92 |
| 2026-02-11 00:00 |
18:05:11.23 |
-11:32:19.1 |
HIP 88719 |
23.40 |
| 2026-02-11 12:00 |
18:05:33.58 |
-11:31:45.1 |
HIP 88719 |
17.90 |
| 2026-02-12 00:00 |
18:05:55.81 |
-11:31:10.7 |
HIP 88719 |
12.44 |
| 2026-02-12 12:00 |
18:06:17.93 |
-11:30:35.7 |
HIP 88719 |
7.02 |
| 2026-02-13 00:00 |
18:06:39.95 |
-11:30:00.3 |
HIP 88719 |
1.79 |
| 2026-02-13 12:00 |
18:07:01.85 |
-11:29:24.3 |
HIP 88719 |
3.98 |
| 2026-02-14 00:00 |
18:07:23.64 |
-11:28:47.9 |
HIP 88719 |
9.29 |
| 2026-02-14 12:00 |
18:07:45.32 |
-11:28:11.1 |
HIP 88719 |
14.61 |
| 2026-02-15 00:00 |
18:08:06.88 |
-11:27:33.8 |
HIP 88719 |
19.92 |
| 2026-02-15 12:00 |
18:08:28.32 |
-11:26:56.0 |
HIP 88916 |
19.31 |
| 2026-02-16 00:00 |
18:08:49.66 |
-11:26:17.7 |
HIP 88916 |
18.50 |
| 2026-02-16 12:00 |
18:09:10.87 |
-11:25:39.0 |
HIP 88916 |
19.16 |
| 2026-02-17 00:00 |
18:09:31.97 |
-11:24:59.9 |
HIP 88984 |
18.77 |
| 2026-02-17 12:00 |
18:09:52.94 |
-11:24:20.3 |
HIP 88984 |
19.23 |
| 2026-02-18 00:00 |
18:10:13.80 |
-11:23:40.3 |
HIP 89136 |
18.91 |
| 2026-02-18 12:00 |
18:10:34.54 |
-11:22:59.8 |
HIP 89136 |
13.85 |
| 2026-02-19 00:00 |
18:10:55.16 |
-11:22:19.0 |
HIP 89136 |
8.90 |
| 2026-02-19 12:00 |
18:11:15.65 |
-11:21:37.7 |
HIP 89136 |
4.32 |
| 2026-02-20 00:00 |
18:11:36.02 |
-11:20:55.9 |
HIP 89136 |
3.07 |
| 2026-02-20 12:00 |
18:11:56.27 |
-11:20:13.8 |
HIP 89136 |
7.11 |
| 2026-02-21 00:00 |
18:12:16.39 |
-11:19:31.3 |
HIP 89136 |
11.88 |
| 2026-02-21 12:00 |
18:12:36.39 |
-11:18:48.3 |
HIP 89136 |
16.75 |
| 2026-02-22 00:00 |
18:12:56.26 |
-11:18:05.0 |
HIP 89136 |
21.62 |
| 2026-02-22 12:00 |
18:13:16.01 |
-11:17:21.3 |
HIP 89136 |
26.49 |
| 2026-02-23 00:00 |
18:13:35.62 |
-11:16:37.2 |
HIP 89136 |
31.33 |
| 2026-02-23 12:00 |
18:13:55.11 |
-11:15:52.7 |
HIP 89524 |
32.17 |
| 2026-02-24 00:00 |
18:14:14.47 |
-11:15:07.8 |
HIP 89524 |
27.36 |