140P/Bowell-Skiff
| 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) |
| 2026-02-03 00:00 |
23:10:30.88 |
-04:53:44.4 |
HIP 114493 |
16.77 |
| 2026-02-03 12:00 |
23:10:41.03 |
-04:52:39.1 |
HIP 114493 |
16.04 |
| 2026-02-04 00:00 |
23:10:51.23 |
-04:51:33.5 |
HIP 114493 |
15.75 |
| 2026-02-04 12:00 |
23:11:01.46 |
-04:50:27.6 |
HIP 114493 |
15.95 |
| 2026-02-05 00:00 |
23:11:11.74 |
-04:49:21.4 |
HIP 114493 |
16.62 |
| 2026-02-05 12:00 |
23:11:22.04 |
-04:48:15.0 |
HIP 114493 |
17.72 |
| 2026-02-06 00:00 |
23:11:32.39 |
-04:47:08.3 |
HIP 114493 |
19.17 |
| 2026-02-06 12:00 |
23:11:42.78 |
-04:46:01.4 |
HIP 114493 |
20.90 |
| 2026-02-07 00:00 |
23:11:53.20 |
-04:44:54.2 |
HIP 114493 |
22.86 |
| 2026-02-07 12:00 |
23:12:03.65 |
-04:43:46.8 |
HIP 114493 |
24.99 |
| 2026-02-08 00:00 |
23:12:14.14 |
-04:42:39.2 |
HIP 114677 |
25.38 |
| 2026-02-08 12:00 |
23:12:24.67 |
-04:41:31.2 |
HIP 114677 |
23.22 |
| 2026-02-09 00:00 |
23:12:35.23 |
-04:40:23.1 |
HIP 114677 |
21.23 |
| 2026-02-09 12:00 |
23:12:45.82 |
-04:39:14.7 |
HIP 114677 |
19.45 |
| 2026-02-10 00:00 |
23:12:56.45 |
-04:38:06.1 |
HIP 114677 |
17.95 |
| 2026-02-10 12:00 |
23:13:07.11 |
-04:36:57.3 |
HIP 114677 |
16.81 |
| 2026-02-11 00:00 |
23:13:17.80 |
-04:35:48.2 |
HIP 114677 |
16.12 |
| 2026-02-11 12:00 |
23:13:28.53 |
-04:34:38.9 |
HIP 114677 |
15.93 |
| 2026-02-12 00:00 |
23:13:39.28 |
-04:33:29.4 |
HIP 114677 |
16.27 |
| 2026-02-12 12:00 |
23:13:50.07 |
-04:32:19.7 |
HIP 114677 |
17.12 |
| 2026-02-13 00:00 |
23:14:00.88 |
-04:31:09.7 |
HIP 114677 |
18.40 |
| 2026-02-13 12:00 |
23:14:11.73 |
-04:29:59.6 |
HIP 114803 |
17.15 |
| 2026-02-14 00:00 |
23:14:22.60 |
-04:28:49.2 |
HIP 114803 |
14.67 |
| 2026-02-14 12:00 |
23:14:33.50 |
-04:27:38.7 |
HIP 114803 |
12.40 |
| 2026-02-15 00:00 |
23:14:44.43 |
-04:26:27.9 |
HIP 114803 |
10.48 |
| 2026-02-15 12:00 |
23:14:55.39 |
-04:25:17.0 |
HIP 114803 |
9.14 |
| 2026-02-16 00:00 |
23:15:06.37 |
-04:24:05.8 |
HIP 114803 |
8.65 |
| 2026-02-16 12:00 |
23:15:17.38 |
-04:22:54.5 |
HIP 114803 |
9.16 |
| 2026-02-17 00:00 |
23:15:28.41 |
-04:21:43.0 |
HIP 114803 |
10.54 |
| 2026-02-17 12:00 |
23:15:39.47 |
-04:20:31.3 |
HIP 114803 |
12.50 |
| 2026-02-18 00:00 |
23:15:50.55 |
-04:19:19.4 |
HIP 114803 |
14.82 |
| 2026-02-18 12:00 |
23:16:01.66 |
-04:18:07.4 |
HIP 114803 |
17.36 |
| 2026-02-19 00:00 |
23:16:12.79 |
-04:16:55.2 |
HIP 114977 |
18.04 |
| 2026-02-19 12:00 |
23:16:23.94 |
-04:15:42.8 |
HIP 114977 |
16.45 |
| 2026-02-20 00:00 |
23:16:35.12 |
-04:14:30.2 |
HIP 114977 |
15.29 |
| 2026-02-20 12:00 |
23:16:46.31 |
-04:13:17.5 |
HIP 114977 |
14.69 |
| 2026-02-21 00:00 |
23:16:57.53 |
-04:12:04.7 |
HIP 114977 |
14.70 |
| 2026-02-21 12:00 |
23:17:08.77 |
-04:10:51.7 |
HIP 114977 |
15.33 |
| 2026-02-22 00:00 |
23:17:20.02 |
-04:09:38.5 |
HIP 114977 |
16.52 |
| 2026-02-22 12:00 |
23:17:31.30 |
-04:08:25.2 |
HIP 114977 |
18.15 |
| 2026-02-23 00:00 |
23:17:42.59 |
-04:07:11.8 |
HIP 114977 |
20.12 |
| 2026-02-23 12:00 |
23:17:53.90 |
-04:05:58.3 |
HIP 114977 |
22.35 |
| 2026-02-24 00:00 |
23:18:05.23 |
-04:04:44.6 |
HIP 114977 |
24.76 |