| Parameter |
Value |
| Designation |
C/2001 B2 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-09-01T18:12:53.487360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:08Z |
| Obs used |
553 |
| NEO |
- |
| M1 |
5.300 |
| K1 |
9.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2001-12-15.0000000 |
| e |
1.00174829 |
| q (au) |
5.306801 |
| a (au) |
-3035.429915 |
| i (deg) |
150.601545 |
| Ω (om, deg) |
145.094774 |
| ω (w, deg) |
304.757037 |
| M (ma, deg) |
0.002765 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.024 + 4.043\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.024 |
| n |
4.043 |
| gf |
0.871 |
| gb |
-0.949 |
| k |
1.000 |
| δ90 |
4.990 |
| 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) |
| 2026-05-12 00:00 |
03:22:50.08 |
+48:08:36.9 |
HIP 15684 |
14.75 |
| 2026-05-12 12:00 |
03:22:53.56 |
+48:08:43.9 |
HIP 15684 |
15.16 |
| 2026-05-13 00:00 |
03:22:57.05 |
+48:08:51.1 |
HIP 15684 |
15.59 |
| 2026-05-13 12:00 |
03:23:00.54 |
+48:08:58.4 |
HIP 15684 |
16.03 |
| 2026-05-14 00:00 |
03:23:04.02 |
+48:09:05.9 |
HIP 15684 |
16.48 |
| 2026-05-14 12:00 |
03:23:07.51 |
+48:09:13.6 |
HIP 15684 |
16.94 |
| 2026-05-15 00:00 |
03:23:10.99 |
+48:09:21.4 |
HIP 15684 |
17.42 |
| 2026-05-15 12:00 |
03:23:14.48 |
+48:09:29.4 |
HIP 15684 |
17.90 |
| 2026-05-16 00:00 |
03:23:17.97 |
+48:09:37.5 |
HIP 15684 |
18.39 |
| 2026-05-16 12:00 |
03:23:21.45 |
+48:09:45.8 |
HIP 15684 |
18.89 |
| 2026-05-17 00:00 |
03:23:24.93 |
+48:09:54.2 |
HIP 15684 |
19.39 |
| 2026-05-17 12:00 |
03:23:28.41 |
+48:10:02.8 |
HIP 15898 |
19.65 |
| 2026-05-18 00:00 |
03:23:31.89 |
+48:10:11.6 |
HIP 15898 |
19.16 |
| 2026-05-18 12:00 |
03:23:35.37 |
+48:10:20.5 |
HIP 15898 |
18.67 |
| 2026-05-19 00:00 |
03:23:38.85 |
+48:10:29.5 |
HIP 15898 |
18.19 |
| 2026-05-19 12:00 |
03:23:42.32 |
+48:10:38.7 |
HIP 15898 |
17.71 |
| 2026-05-20 00:00 |
03:23:45.79 |
+48:10:48.0 |
HIP 15898 |
17.24 |
| 2026-05-20 12:00 |
03:23:49.26 |
+48:10:57.5 |
HIP 15898 |
16.77 |
| 2026-05-21 00:00 |
03:23:52.72 |
+48:11:07.2 |
HIP 15898 |
16.32 |
| 2026-05-21 12:00 |
03:23:56.18 |
+48:11:17.0 |
HIP 15898 |
15.87 |
| 2026-05-22 00:00 |
03:23:59.64 |
+48:11:26.9 |
HIP 15898 |
15.42 |
| 2026-05-22 12:00 |
03:24:03.09 |
+48:11:37.0 |
HIP 15898 |
14.99 |
| 2026-05-23 00:00 |
03:24:06.54 |
+48:11:47.2 |
HIP 15898 |
14.57 |
| 2026-05-23 12:00 |
03:24:09.98 |
+48:11:57.6 |
HIP 15898 |
14.16 |
| 2026-05-24 00:00 |
03:24:13.42 |
+48:12:08.1 |
HIP 15898 |
13.76 |
| 2026-05-24 12:00 |
03:24:16.85 |
+48:12:18.7 |
HIP 15898 |
13.37 |
| 2026-05-25 00:00 |
03:24:20.28 |
+48:12:29.5 |
HIP 15898 |
13.00 |
| 2026-05-25 12:00 |
03:24:23.70 |
+48:12:40.5 |
HIP 15898 |
12.64 |
| 2026-05-26 00:00 |
03:24:27.12 |
+48:12:51.5 |
HIP 15898 |
12.30 |
| 2026-05-26 12:00 |
03:24:30.53 |
+48:13:02.7 |
HIP 15898 |
11.98 |
| 2026-05-27 00:00 |
03:24:33.93 |
+48:13:14.1 |
HIP 15898 |
11.67 |
| 2026-05-27 12:00 |
03:24:37.33 |
+48:13:25.6 |
HIP 15898 |
11.39 |
| 2026-05-28 00:00 |
03:24:40.72 |
+48:13:37.2 |
HIP 15898 |
11.13 |
| 2026-05-28 12:00 |
03:24:44.11 |
+48:13:49.0 |
HIP 15898 |
10.90 |
| 2026-05-29 00:00 |
03:24:47.49 |
+48:14:00.8 |
HIP 15898 |
10.69 |
| 2026-05-29 12:00 |
03:24:50.86 |
+48:14:12.9 |
HIP 15898 |
10.51 |
| 2026-05-30 00:00 |
03:24:54.22 |
+48:14:25.0 |
HIP 15898 |
10.35 |
| 2026-05-30 12:00 |
03:24:57.57 |
+48:14:37.3 |
HIP 15898 |
10.23 |
| 2026-05-31 00:00 |
03:25:00.92 |
+48:14:49.7 |
HIP 15898 |
10.14 |
| 2026-05-31 12:00 |
03:25:04.26 |
+48:15:02.3 |
HIP 15898 |
10.08 |
| 2026-06-01 00:00 |
03:25:07.59 |
+48:15:14.9 |
HIP 15898 |
10.05 |
| 2026-06-01 12:00 |
03:25:10.91 |
+48:15:27.8 |
HIP 15898 |
10.05 |
| 2026-06-02 00:00 |
03:25:14.22 |
+48:15:40.7 |
HIP 15898 |
10.09 |