| Parameter |
Value |
| Designation |
C/2001 W2 (BATTERS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2001-12-23T22:02:21.914880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:11Z |
| Obs used |
350 |
| NEO |
Yes |
| M1 |
12.100 |
| K1 |
10.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2001-12-05.0000000 |
| e |
0.94137478 |
| q (au) |
1.051065 |
| a (au) |
17.928550 |
| i (deg) |
115.913079 |
| Ω (om, deg) |
113.355852 |
| ω (w, deg) |
142.085792 |
| M (ma, deg) |
359.754377 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.657 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.657 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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) |
| 2026-06-01 00:00 |
08:22:08.95 |
-19:55:48.0 |
HIP 40944 |
14.34 |
| 2026-06-01 12:00 |
08:22:11.15 |
-19:55:23.8 |
HIP 40944 |
15.00 |
| 2026-06-02 00:00 |
08:22:13.38 |
-19:54:59.8 |
HIP 40944 |
15.65 |
| 2026-06-02 12:00 |
08:22:15.63 |
-19:54:36.1 |
HIP 40944 |
16.32 |
| 2026-06-03 00:00 |
08:22:17.91 |
-19:54:12.6 |
HIP 40944 |
16.98 |
| 2026-06-03 12:00 |
08:22:20.21 |
-19:53:49.4 |
HIP 40944 |
17.64 |
| 2026-06-04 00:00 |
08:22:22.53 |
-19:53:26.4 |
HIP 40944 |
18.31 |
| 2026-06-04 12:00 |
08:22:24.87 |
-19:53:03.7 |
HIP 40944 |
18.97 |
| 2026-06-05 00:00 |
08:22:27.24 |
-19:52:41.2 |
HIP 40944 |
19.64 |
| 2026-06-05 12:00 |
08:22:29.63 |
-19:52:19.0 |
HIP 40944 |
20.31 |
| 2026-06-06 00:00 |
08:22:32.05 |
-19:51:57.1 |
HIP 40944 |
20.99 |
| 2026-06-06 12:00 |
08:22:34.48 |
-19:51:35.4 |
HIP 40944 |
21.66 |
| 2026-06-07 00:00 |
08:22:36.94 |
-19:51:14.0 |
HIP 40944 |
22.34 |
| 2026-06-07 12:00 |
08:22:39.43 |
-19:50:52.9 |
HIP 40944 |
23.02 |
| 2026-06-08 00:00 |
08:22:41.93 |
-19:50:32.0 |
HIP 40944 |
23.70 |
| 2026-06-08 12:00 |
08:22:44.45 |
-19:50:11.3 |
HIP 40944 |
24.38 |
| 2026-06-09 00:00 |
08:22:47.00 |
-19:49:51.0 |
HIP 40944 |
25.06 |
| 2026-06-09 12:00 |
08:22:49.57 |
-19:49:30.9 |
HIP 40944 |
25.75 |
| 2026-06-10 00:00 |
08:22:52.16 |
-19:49:11.1 |
HIP 40944 |
26.43 |
| 2026-06-10 12:00 |
08:22:54.77 |
-19:48:51.5 |
HIP 40944 |
27.12 |
| 2026-06-11 00:00 |
08:22:57.41 |
-19:48:32.2 |
HIP 40944 |
27.81 |
| 2026-06-11 12:00 |
08:23:00.06 |
-19:48:13.2 |
HIP 40944 |
28.50 |
| 2026-06-12 00:00 |
08:23:02.73 |
-19:47:54.5 |
HIP 40944 |
29.20 |
| 2026-06-12 12:00 |
08:23:05.43 |
-19:47:36.0 |
HIP 40944 |
29.89 |
| 2026-06-13 00:00 |
08:23:08.15 |
-19:47:17.9 |
HIP 40944 |
30.59 |
| 2026-06-13 12:00 |
08:23:10.88 |
-19:47:00.0 |
HIP 40944 |
31.29 |
| 2026-06-14 00:00 |
08:23:13.64 |
-19:46:42.3 |
HIP 40944 |
31.99 |
| 2026-06-14 12:00 |
08:23:16.41 |
-19:46:25.0 |
HIP 40944 |
32.69 |
| 2026-06-15 00:00 |
08:23:19.20 |
-19:46:07.9 |
HIP 40944 |
33.40 |
| 2026-06-15 12:00 |
08:23:22.02 |
-19:45:51.1 |
HIP 40944 |
34.10 |
| 2026-06-16 00:00 |
08:23:24.85 |
-19:45:34.6 |
HIP 40944 |
34.81 |
| 2026-06-16 12:00 |
08:23:27.70 |
-19:45:18.3 |
HIP 40944 |
35.52 |
| 2026-06-17 00:00 |
08:23:30.57 |
-19:45:02.4 |
HIP 40944 |
36.23 |
| 2026-06-17 12:00 |
08:23:33.46 |
-19:44:46.7 |
HIP 41339 |
36.53 |
| 2026-06-18 00:00 |
08:23:36.37 |
-19:44:31.3 |
HIP 41339 |
35.81 |
| 2026-06-18 12:00 |
08:23:39.29 |
-19:44:16.2 |
HIP 41339 |
35.08 |
| 2026-06-19 00:00 |
08:23:42.23 |
-19:44:01.4 |
HIP 41339 |
34.35 |
| 2026-06-19 12:00 |
08:23:45.19 |
-19:43:46.9 |
HIP 41339 |
33.62 |
| 2026-06-20 00:00 |
08:23:48.17 |
-19:43:32.7 |
HIP 41339 |
32.89 |
| 2026-06-20 12:00 |
08:23:51.16 |
-19:43:18.7 |
HIP 41339 |
32.15 |
| 2026-06-21 00:00 |
08:23:54.17 |
-19:43:05.0 |
HIP 41339 |
31.41 |
| 2026-06-21 12:00 |
08:23:57.20 |
-19:42:51.6 |
HIP 41339 |
30.67 |
| 2026-06-22 00:00 |
08:24:00.24 |
-19:42:38.5 |
HIP 41339 |
29.92 |