| 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) |
| 2026-07-29 00:00 |
23:49:57.32 |
-00:22:38.5 |
HIP 117395 |
35.39 |
| 2026-07-29 12:00 |
23:49:52.23 |
-00:23:07.2 |
HIP 117395 |
34.14 |
| 2026-07-30 00:00 |
23:49:47.07 |
-00:23:36.5 |
HIP 117395 |
32.87 |
| 2026-07-30 12:00 |
23:49:41.81 |
-00:24:06.3 |
HIP 117395 |
31.58 |
| 2026-07-31 00:00 |
23:49:36.48 |
-00:24:36.7 |
HIP 117395 |
30.29 |
| 2026-07-31 12:00 |
23:49:31.06 |
-00:25:07.6 |
HIP 117395 |
28.99 |
| 2026-08-01 00:00 |
23:49:25.56 |
-00:25:39.1 |
HIP 117395 |
27.68 |
| 2026-08-01 12:00 |
23:49:19.97 |
-00:26:11.1 |
HIP 117395 |
26.37 |
| 2026-08-02 00:00 |
23:49:14.30 |
-00:26:43.7 |
HIP 117395 |
25.05 |
| 2026-08-02 12:00 |
23:49:08.55 |
-00:27:16.8 |
HIP 117395 |
23.75 |
| 2026-08-03 00:00 |
23:49:02.72 |
-00:27:50.4 |
HIP 117395 |
22.45 |
| 2026-08-03 12:00 |
23:48:56.81 |
-00:28:24.6 |
HIP 117395 |
21.18 |
| 2026-08-04 00:00 |
23:48:50.81 |
-00:28:59.3 |
HIP 117395 |
19.93 |
| 2026-08-04 12:00 |
23:48:44.74 |
-00:29:34.5 |
HIP 117395 |
18.72 |
| 2026-08-05 00:00 |
23:48:38.59 |
-00:30:10.3 |
HIP 117395 |
17.56 |
| 2026-08-05 12:00 |
23:48:32.35 |
-00:30:46.6 |
HIP 117395 |
16.46 |
| 2026-08-06 00:00 |
23:48:26.04 |
-00:31:23.4 |
HIP 117395 |
15.46 |
| 2026-08-06 12:00 |
23:48:19.64 |
-00:32:00.8 |
HIP 117395 |
14.58 |
| 2026-08-07 00:00 |
23:48:13.17 |
-00:32:38.6 |
HIP 117395 |
13.85 |
| 2026-08-07 12:00 |
23:48:06.63 |
-00:33:17.0 |
HIP 117395 |
13.29 |
| 2026-08-08 00:00 |
23:48:00.00 |
-00:33:55.9 |
HIP 117354 |
12.63 |
| 2026-08-08 12:00 |
23:47:53.30 |
-00:34:35.3 |
HIP 117354 |
11.49 |
| 2026-08-09 00:00 |
23:47:46.52 |
-00:35:15.2 |
HIP 117354 |
10.53 |
| 2026-08-09 12:00 |
23:47:39.66 |
-00:35:55.5 |
HIP 117354 |
9.82 |
| 2026-08-10 00:00 |
23:47:32.74 |
-00:36:36.4 |
HIP 117354 |
9.41 |
| 2026-08-10 12:00 |
23:47:25.73 |
-00:37:17.8 |
HIP 117354 |
9.36 |
| 2026-08-11 00:00 |
23:47:18.65 |
-00:37:59.7 |
HIP 117354 |
9.69 |
| 2026-08-11 12:00 |
23:47:11.50 |
-00:38:42.1 |
HIP 117354 |
10.37 |
| 2026-08-12 00:00 |
23:47:04.28 |
-00:39:24.9 |
HIP 117354 |
11.34 |
| 2026-08-12 12:00 |
23:46:56.99 |
-00:40:08.2 |
HIP 117354 |
12.56 |
| 2026-08-13 00:00 |
23:46:49.62 |
-00:40:52.0 |
HIP 117354 |
13.96 |
| 2026-08-13 12:00 |
23:46:42.19 |
-00:41:36.3 |
HIP 117354 |
15.51 |
| 2026-08-14 00:00 |
23:46:34.68 |
-00:42:21.0 |
HIP 117354 |
17.16 |
| 2026-08-14 12:00 |
23:46:27.11 |
-00:43:06.2 |
HIP 117354 |
18.90 |
| 2026-08-15 00:00 |
23:46:19.46 |
-00:43:51.8 |
HIP 117151 |
20.30 |
| 2026-08-15 12:00 |
23:46:11.76 |
-00:44:37.9 |
HIP 117151 |
18.61 |
| 2026-08-16 00:00 |
23:46:03.98 |
-00:45:24.4 |
HIP 117151 |
17.00 |
| 2026-08-16 12:00 |
23:45:56.14 |
-00:46:11.3 |
HIP 117151 |
15.48 |
| 2026-08-17 00:00 |
23:45:48.23 |
-00:46:58.7 |
HIP 117151 |
14.12 |
| 2026-08-17 12:00 |
23:45:40.26 |
-00:47:46.5 |
HIP 117151 |
12.95 |
| 2026-08-18 00:00 |
23:45:32.23 |
-00:48:34.8 |
HIP 117151 |
12.04 |
| 2026-08-18 12:00 |
23:45:24.14 |
-00:49:23.4 |
HIP 117151 |
11.48 |
| 2026-08-19 00:00 |
23:45:15.98 |
-00:50:12.5 |
HIP 117151 |
11.31 |