| 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) |
| 2026-03-26 00:00 |
08:21:43.06 |
-21:15:25.1 |
HIP 40958 |
27.91 |
| 2026-03-26 12:00 |
08:21:41.11 |
-21:14:45.2 |
HIP 40958 |
27.20 |
| 2026-03-27 00:00 |
08:21:39.18 |
-21:14:05.3 |
HIP 40958 |
26.50 |
| 2026-03-27 12:00 |
08:21:37.29 |
-21:13:25.3 |
HIP 40958 |
25.80 |
| 2026-03-28 00:00 |
08:21:35.43 |
-21:12:45.2 |
HIP 40958 |
25.11 |
| 2026-03-28 12:00 |
08:21:33.61 |
-21:12:05.2 |
HIP 40958 |
24.43 |
| 2026-03-29 00:00 |
08:21:31.81 |
-21:11:25.0 |
HIP 40958 |
23.75 |
| 2026-03-29 12:00 |
08:21:30.05 |
-21:10:44.9 |
HIP 40958 |
23.08 |
| 2026-03-30 00:00 |
08:21:28.32 |
-21:10:04.6 |
HIP 40958 |
22.42 |
| 2026-03-30 12:00 |
08:21:26.62 |
-21:09:24.4 |
HIP 40958 |
21.76 |
| 2026-03-31 00:00 |
08:21:24.95 |
-21:08:44.1 |
HIP 40958 |
21.11 |
| 2026-03-31 12:00 |
08:21:23.31 |
-21:08:03.8 |
HIP 40958 |
20.46 |
| 2026-04-01 00:00 |
08:21:21.71 |
-21:07:23.5 |
HIP 40958 |
19.83 |
| 2026-04-01 12:00 |
08:21:20.14 |
-21:06:43.1 |
HIP 40958 |
19.20 |
| 2026-04-02 00:00 |
08:21:18.60 |
-21:06:02.7 |
HIP 40958 |
18.58 |
| 2026-04-02 12:00 |
08:21:17.09 |
-21:05:22.3 |
HIP 40958 |
17.97 |
| 2026-04-03 00:00 |
08:21:15.62 |
-21:04:41.9 |
HIP 40958 |
17.37 |
| 2026-04-03 12:00 |
08:21:14.18 |
-21:04:01.4 |
HIP 40958 |
16.79 |
| 2026-04-04 00:00 |
08:21:12.77 |
-21:03:21.0 |
HIP 40958 |
16.21 |
| 2026-04-04 12:00 |
08:21:11.39 |
-21:02:40.5 |
HIP 40958 |
15.65 |
| 2026-04-05 00:00 |
08:21:10.05 |
-21:02:00.1 |
HIP 40958 |
15.10 |
| 2026-04-05 12:00 |
08:21:08.73 |
-21:01:19.6 |
HIP 40958 |
14.56 |
| 2026-04-06 00:00 |
08:21:07.46 |
-21:00:39.1 |
HIP 40958 |
14.04 |
| 2026-04-06 12:00 |
08:21:06.21 |
-20:59:58.6 |
HIP 40958 |
13.54 |
| 2026-04-07 00:00 |
08:21:05.00 |
-20:59:18.2 |
HIP 40958 |
13.06 |
| 2026-04-07 12:00 |
08:21:03.82 |
-20:58:37.7 |
HIP 40958 |
12.59 |
| 2026-04-08 00:00 |
08:21:02.67 |
-20:57:57.3 |
HIP 40958 |
12.15 |
| 2026-04-08 12:00 |
08:21:01.56 |
-20:57:16.9 |
HIP 40958 |
11.73 |
| 2026-04-09 00:00 |
08:21:00.48 |
-20:56:36.5 |
HIP 40958 |
11.34 |
| 2026-04-09 12:00 |
08:20:59.43 |
-20:55:56.1 |
HIP 40958 |
10.98 |
| 2026-04-10 00:00 |
08:20:58.42 |
-20:55:15.7 |
HIP 40958 |
10.65 |
| 2026-04-10 12:00 |
08:20:57.44 |
-20:54:35.4 |
HIP 40958 |
10.35 |
| 2026-04-11 00:00 |
08:20:56.49 |
-20:53:55.0 |
HIP 40958 |
10.08 |
| 2026-04-11 12:00 |
08:20:55.57 |
-20:53:14.8 |
HIP 40958 |
9.86 |
| 2026-04-12 00:00 |
08:20:54.69 |
-20:52:34.5 |
HIP 40958 |
9.67 |
| 2026-04-12 12:00 |
08:20:53.85 |
-20:51:54.3 |
HIP 40958 |
9.52 |
| 2026-04-13 00:00 |
08:20:53.03 |
-20:51:14.1 |
HIP 40958 |
9.42 |
| 2026-04-13 12:00 |
08:20:52.25 |
-20:50:34.0 |
HIP 40958 |
9.36 |
| 2026-04-14 00:00 |
08:20:51.51 |
-20:49:53.9 |
HIP 40958 |
9.35 |
| 2026-04-14 12:00 |
08:20:50.79 |
-20:49:13.9 |
HIP 40958 |
9.38 |
| 2026-04-15 00:00 |
08:20:50.12 |
-20:48:33.9 |
HIP 40958 |
9.45 |
| 2026-04-15 12:00 |
08:20:49.47 |
-20:47:54.0 |
HIP 40958 |
9.56 |
| 2026-04-16 00:00 |
08:20:48.86 |
-20:47:14.1 |
HIP 40958 |
9.71 |