| Parameter |
Value |
| Designation |
140P/Bowell-Skiff |
| Type |
P |
| Perihelion (tp_cal, UTC) |
1999-05-14T19:29:10.665600Z |
| Orbit solution date (soln_date, UTC) |
- |
| Obs used |
- |
| NEO |
- |
| M1 |
11.500 |
| K1 |
15.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1999-05-22.0000000 |
| e |
0.69176166 |
| q (au) |
1.971877 |
| a (au) |
6.397248 |
| i (deg) |
3.835828 |
| Ω (om, deg) |
343.456457 |
| ω (w, deg) |
173.086771 |
| M (ma, deg) |
0.437851 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.912 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.912 |
| 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) |
| 2026-05-12 00:00 |
23:45:15.94 |
-01:03:35.1 |
HIP 117151 |
24.29 |
| 2026-05-12 12:00 |
23:45:23.78 |
-01:02:40.9 |
HIP 117151 |
23.81 |
| 2026-05-13 00:00 |
23:45:31.57 |
-01:01:47.0 |
HIP 117151 |
23.52 |
| 2026-05-13 12:00 |
23:45:39.30 |
-01:00:53.5 |
HIP 117151 |
23.43 |
| 2026-05-14 00:00 |
23:45:46.96 |
-01:00:00.4 |
HIP 117151 |
23.52 |
| 2026-05-14 12:00 |
23:45:54.56 |
-00:59:07.7 |
HIP 117151 |
23.80 |
| 2026-05-15 00:00 |
23:46:02.10 |
-00:58:15.4 |
HIP 117151 |
24.25 |
| 2026-05-15 12:00 |
23:46:09.58 |
-00:57:23.4 |
HIP 117151 |
24.86 |
| 2026-05-16 00:00 |
23:46:17.00 |
-00:56:31.9 |
HIP 117354 |
23.84 |
| 2026-05-16 12:00 |
23:46:24.35 |
-00:55:40.7 |
HIP 117354 |
21.81 |
| 2026-05-17 00:00 |
23:46:31.64 |
-00:54:50.0 |
HIP 117354 |
19.80 |
| 2026-05-17 12:00 |
23:46:38.86 |
-00:53:59.6 |
HIP 117354 |
17.82 |
| 2026-05-18 00:00 |
23:46:46.02 |
-00:53:09.7 |
HIP 117354 |
15.84 |
| 2026-05-18 12:00 |
23:46:53.11 |
-00:52:20.2 |
HIP 117354 |
13.89 |
| 2026-05-19 00:00 |
23:47:00.14 |
-00:51:31.1 |
HIP 117354 |
11.96 |
| 2026-05-19 12:00 |
23:47:07.10 |
-00:50:42.4 |
HIP 117354 |
10.04 |
| 2026-05-20 00:00 |
23:47:14.00 |
-00:49:54.1 |
HIP 117354 |
8.15 |
| 2026-05-20 12:00 |
23:47:20.82 |
-00:49:06.3 |
HIP 117354 |
6.28 |
| 2026-05-21 00:00 |
23:47:27.58 |
-00:48:18.9 |
HIP 117354 |
4.44 |
| 2026-05-21 12:00 |
23:47:34.27 |
-00:47:31.9 |
HIP 117354 |
2.64 |
| 2026-05-22 00:00 |
23:47:40.90 |
-00:46:45.3 |
HIP 117354 |
1.06 |
| 2026-05-22 12:00 |
23:47:47.45 |
-00:45:59.2 |
HIP 117354 |
1.39 |
| 2026-05-23 00:00 |
23:47:53.94 |
-00:45:13.5 |
HIP 117354 |
3.03 |
| 2026-05-23 12:00 |
23:48:00.36 |
-00:44:28.2 |
HIP 117395 |
3.69 |
| 2026-05-24 00:00 |
23:48:06.70 |
-00:43:43.4 |
HIP 117395 |
3.15 |
| 2026-05-24 12:00 |
23:48:12.98 |
-00:42:59.1 |
HIP 117395 |
3.51 |
| 2026-05-25 00:00 |
23:48:19.19 |
-00:42:15.1 |
HIP 117395 |
4.54 |
| 2026-05-25 12:00 |
23:48:25.32 |
-00:41:31.6 |
HIP 117395 |
5.88 |
| 2026-05-26 00:00 |
23:48:31.39 |
-00:40:48.6 |
HIP 117395 |
7.36 |
| 2026-05-26 12:00 |
23:48:37.38 |
-00:40:06.0 |
HIP 117395 |
8.88 |
| 2026-05-27 00:00 |
23:48:43.30 |
-00:39:23.9 |
HIP 117395 |
10.43 |
| 2026-05-27 12:00 |
23:48:49.15 |
-00:38:42.2 |
HIP 117395 |
11.99 |
| 2026-05-28 00:00 |
23:48:54.93 |
-00:38:01.0 |
HIP 117395 |
13.54 |
| 2026-05-28 12:00 |
23:49:00.64 |
-00:37:20.3 |
HIP 117395 |
15.08 |
| 2026-05-29 00:00 |
23:49:06.27 |
-00:36:40.0 |
HIP 117395 |
16.61 |
| 2026-05-29 12:00 |
23:49:11.83 |
-00:36:00.1 |
HIP 117395 |
18.12 |
| 2026-05-30 00:00 |
23:49:17.31 |
-00:35:20.8 |
HIP 117395 |
19.62 |
| 2026-05-30 12:00 |
23:49:22.72 |
-00:34:41.9 |
HIP 117395 |
21.11 |
| 2026-05-31 00:00 |
23:49:28.06 |
-00:34:03.5 |
HIP 117395 |
22.57 |
| 2026-05-31 12:00 |
23:49:33.32 |
-00:33:25.5 |
HIP 117395 |
24.02 |
| 2026-06-01 00:00 |
23:49:38.50 |
-00:32:48.0 |
HIP 117395 |
25.45 |
| 2026-06-01 12:00 |
23:49:43.61 |
-00:32:11.1 |
HIP 117395 |
26.85 |
| 2026-06-02 00:00 |
23:49:48.64 |
-00:31:34.6 |
HIP 117395 |
28.24 |