| Parameter |
Value |
| Designation |
293P/Spacewatch |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-01-10T06:55:08.644800Z |
| Orbit solution date (soln_date, UTC) |
2022-06-12T21:06:40Z |
| Obs used |
463 |
| NEO |
- |
| M1 |
15.800 |
| K1 |
7.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-01-02.0000000 |
| e |
0.41974111 |
| q (au) |
2.111752 |
| a (au) |
3.639328 |
| i (deg) |
9.064844 |
| Ω (om, deg) |
78.437790 |
| ω (w, deg) |
41.152848 |
| M (ma, deg) |
358.823377 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.488 + 2.988\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.488 |
| n |
2.988 |
| gf |
1.000 |
| gb |
-0.716 |
| k |
0.994 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
01:17:27.04 |
-02:39:28.6 |
HIP 5958 |
12.06 |
| 2026-07-29 12:00 |
01:17:34.72 |
-02:39:55.8 |
HIP 5958 |
13.92 |
| 2026-07-30 00:00 |
01:17:42.18 |
-02:40:24.4 |
HIP 5958 |
15.74 |
| 2026-07-30 12:00 |
01:17:49.42 |
-02:40:54.5 |
HIP 5958 |
17.53 |
| 2026-07-31 00:00 |
01:17:56.43 |
-02:41:26.2 |
HIP 5958 |
19.28 |
| 2026-07-31 12:00 |
01:18:03.21 |
-02:41:59.3 |
HIP 5958 |
20.99 |
| 2026-08-01 00:00 |
01:18:09.76 |
-02:42:33.9 |
HIP 5958 |
22.65 |
| 2026-08-01 12:00 |
01:18:16.08 |
-02:43:10.1 |
HIP 5958 |
24.27 |
| 2026-08-02 00:00 |
01:18:22.17 |
-02:43:47.7 |
HIP 5958 |
25.84 |
| 2026-08-02 12:00 |
01:18:28.03 |
-02:44:26.9 |
HIP 5958 |
27.37 |
| 2026-08-03 00:00 |
01:18:33.65 |
-02:45:07.6 |
HIP 6246 |
28.33 |
| 2026-08-03 12:00 |
01:18:39.03 |
-02:45:49.8 |
HIP 6246 |
27.63 |
| 2026-08-04 00:00 |
01:18:44.18 |
-02:46:33.5 |
HIP 6246 |
27.06 |
| 2026-08-04 12:00 |
01:18:49.09 |
-02:47:18.7 |
HIP 6246 |
26.62 |
| 2026-08-05 00:00 |
01:18:53.76 |
-02:48:05.5 |
HIP 6246 |
26.31 |
| 2026-08-05 12:00 |
01:18:58.18 |
-02:48:53.7 |
HIP 6246 |
26.14 |
| 2026-08-06 00:00 |
01:19:02.37 |
-02:49:43.5 |
HIP 6246 |
26.09 |
| 2026-08-06 12:00 |
01:19:06.31 |
-02:50:34.8 |
HIP 6246 |
26.17 |
| 2026-08-07 00:00 |
01:19:10.00 |
-02:51:27.7 |
HIP 6246 |
26.37 |
| 2026-08-07 12:00 |
01:19:13.45 |
-02:52:22.0 |
HIP 6246 |
26.68 |
| 2026-08-08 00:00 |
01:19:16.64 |
-02:53:17.9 |
HIP 6246 |
27.09 |
| 2026-08-08 12:00 |
01:19:19.59 |
-02:54:15.2 |
HIP 6246 |
27.61 |
| 2026-08-09 00:00 |
01:19:22.29 |
-02:55:14.1 |
HIP 6283 |
26.63 |
| 2026-08-09 12:00 |
01:19:24.73 |
-02:56:14.5 |
HIP 6283 |
25.48 |
| 2026-08-10 00:00 |
01:19:26.92 |
-02:57:16.4 |
HIP 6283 |
24.35 |
| 2026-08-10 12:00 |
01:19:28.86 |
-02:58:19.8 |
HIP 6283 |
23.26 |
| 2026-08-11 00:00 |
01:19:30.54 |
-02:59:24.8 |
HIP 6283 |
22.20 |
| 2026-08-11 12:00 |
01:19:31.96 |
-03:00:31.2 |
HIP 6283 |
21.19 |
| 2026-08-12 00:00 |
01:19:33.12 |
-03:01:39.1 |
HIP 6283 |
20.22 |
| 2026-08-12 12:00 |
01:19:34.03 |
-03:02:48.5 |
HIP 6283 |
19.31 |
| 2026-08-13 00:00 |
01:19:34.68 |
-03:03:59.3 |
HIP 6283 |
18.46 |
| 2026-08-13 12:00 |
01:19:35.06 |
-03:05:11.7 |
HIP 6283 |
17.70 |
| 2026-08-14 00:00 |
01:19:35.19 |
-03:06:25.5 |
HIP 6283 |
17.04 |
| 2026-08-14 12:00 |
01:19:35.05 |
-03:07:40.7 |
HIP 6283 |
16.48 |
| 2026-08-15 00:00 |
01:19:34.65 |
-03:08:57.5 |
HIP 6283 |
16.07 |
| 2026-08-15 12:00 |
01:19:33.99 |
-03:10:15.6 |
HIP 6283 |
15.80 |
| 2026-08-16 00:00 |
01:19:33.06 |
-03:11:35.2 |
HIP 6283 |
15.69 |
| 2026-08-16 12:00 |
01:19:31.87 |
-03:12:56.2 |
HIP 6283 |
15.76 |
| 2026-08-17 00:00 |
01:19:30.41 |
-03:14:18.7 |
HIP 6283 |
16.02 |
| 2026-08-17 12:00 |
01:19:28.69 |
-03:15:42.5 |
HIP 6283 |
16.47 |
| 2026-08-18 00:00 |
01:19:26.71 |
-03:17:07.8 |
HIP 6283 |
17.10 |
| 2026-08-18 12:00 |
01:19:24.45 |
-03:18:34.4 |
HIP 6283 |
17.90 |
| 2026-08-19 00:00 |
01:19:21.93 |
-03:20:02.5 |
HIP 6283 |
18.87 |