| 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) |
| 2026-03-26 00:00 |
23:29:36.79 |
-02:49:04.6 |
HIP 115862 |
20.02 |
| 2026-03-26 12:00 |
23:29:48.18 |
-02:47:49.1 |
HIP 115862 |
22.02 |
| 2026-03-27 00:00 |
23:29:59.56 |
-02:46:33.7 |
HIP 115862 |
24.25 |
| 2026-03-27 12:00 |
23:30:10.92 |
-02:45:18.4 |
HIP 115862 |
26.65 |
| 2026-03-28 00:00 |
23:30:22.27 |
-02:44:03.1 |
HIP 115862 |
29.18 |
| 2026-03-28 12:00 |
23:30:33.60 |
-02:42:47.9 |
HIP 116159 |
30.34 |
| 2026-03-29 00:00 |
23:30:44.91 |
-02:41:32.9 |
HIP 116159 |
29.04 |
| 2026-03-29 12:00 |
23:30:56.20 |
-02:40:17.9 |
HIP 116159 |
28.02 |
| 2026-03-30 00:00 |
23:31:07.48 |
-02:39:03.0 |
HIP 116159 |
27.32 |
| 2026-03-30 12:00 |
23:31:18.74 |
-02:37:48.2 |
HIP 116159 |
26.95 |
| 2026-03-31 00:00 |
23:31:29.97 |
-02:36:33.5 |
HIP 116159 |
26.93 |
| 2026-03-31 12:00 |
23:31:41.19 |
-02:35:18.9 |
HIP 116159 |
27.26 |
| 2026-04-01 00:00 |
23:31:52.39 |
-02:34:04.5 |
HIP 116159 |
27.92 |
| 2026-04-01 12:00 |
23:32:03.57 |
-02:32:50.1 |
HIP 116159 |
28.89 |
| 2026-04-02 00:00 |
23:32:14.72 |
-02:31:35.9 |
HIP 116290 |
27.51 |
| 2026-04-02 12:00 |
23:32:25.86 |
-02:30:21.7 |
HIP 116290 |
24.57 |
| 2026-04-03 00:00 |
23:32:36.97 |
-02:29:07.7 |
HIP 116290 |
21.66 |
| 2026-04-03 12:00 |
23:32:48.06 |
-02:27:53.8 |
HIP 116290 |
18.80 |
| 2026-04-04 00:00 |
23:32:59.13 |
-02:26:40.1 |
HIP 116290 |
16.00 |
| 2026-04-04 12:00 |
23:33:10.18 |
-02:25:26.4 |
HIP 116290 |
13.32 |
| 2026-04-05 00:00 |
23:33:21.20 |
-02:24:12.9 |
HIP 116290 |
10.81 |
| 2026-04-05 12:00 |
23:33:32.19 |
-02:22:59.6 |
HIP 116290 |
8.64 |
| 2026-04-06 00:00 |
23:33:43.17 |
-02:21:46.4 |
HIP 116290 |
7.12 |
| 2026-04-06 12:00 |
23:33:54.11 |
-02:20:33.3 |
HIP 116290 |
6.67 |
| 2026-04-07 00:00 |
23:34:05.04 |
-02:19:20.3 |
HIP 116290 |
7.50 |
| 2026-04-07 12:00 |
23:34:15.93 |
-02:18:07.5 |
HIP 116290 |
9.27 |
| 2026-04-08 00:00 |
23:34:26.80 |
-02:16:54.9 |
HIP 116290 |
11.53 |
| 2026-04-08 12:00 |
23:34:37.64 |
-02:15:42.4 |
HIP 116290 |
14.06 |
| 2026-04-09 00:00 |
23:34:48.45 |
-02:14:30.1 |
HIP 116290 |
16.72 |
| 2026-04-09 12:00 |
23:34:59.24 |
-02:13:17.9 |
HIP 116290 |
19.46 |
| 2026-04-10 00:00 |
23:35:10.00 |
-02:12:05.9 |
HIP 116290 |
22.25 |
| 2026-04-10 12:00 |
23:35:20.73 |
-02:10:54.1 |
HIP 116290 |
25.07 |
| 2026-04-11 00:00 |
23:35:31.42 |
-02:09:42.4 |
HIP 116290 |
27.90 |
| 2026-04-11 12:00 |
23:35:42.09 |
-02:08:31.0 |
HIP 116290 |
30.74 |
| 2026-04-12 00:00 |
23:35:52.73 |
-02:07:19.6 |
HIP 116290 |
33.59 |
| 2026-04-12 12:00 |
23:36:03.34 |
-02:06:08.5 |
HIP 116290 |
36.44 |
| 2026-04-13 00:00 |
23:36:13.91 |
-02:04:57.6 |
HIP 116559 |
37.31 |
| 2026-04-13 12:00 |
23:36:24.45 |
-02:03:46.8 |
HIP 116559 |
35.17 |
| 2026-04-14 00:00 |
23:36:34.96 |
-02:02:36.3 |
HIP 116559 |
33.15 |
| 2026-04-14 12:00 |
23:36:45.44 |
-02:01:25.9 |
HIP 116559 |
31.28 |
| 2026-04-15 00:00 |
23:36:55.88 |
-02:00:15.7 |
HIP 116559 |
29.57 |
| 2026-04-15 12:00 |
23:37:06.29 |
-01:59:05.8 |
HIP 116559 |
28.04 |
| 2026-04-16 00:00 |
23:37:16.66 |
-01:57:56.0 |
HIP 116559 |
26.75 |