| Parameter |
Value |
| Designation |
C/2001 Q1 (NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2001-09-20T20:53:33.852480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:10Z |
| Obs used |
77 |
| NEO |
- |
| M1 |
11.900 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2001-09-28.0000000 |
| e |
0.96593590 |
| q (au) |
5.833970 |
| a (au) |
171.264460 |
| i (deg) |
66.950479 |
| Ω (om, deg) |
139.261335 |
| ω (w, deg) |
175.461635 |
| M (ma, deg) |
0.003135 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.300 + 3.360\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.300 |
| n |
3.360 |
| gf |
0.882 |
| gb |
-0.935 |
| k |
1.000 |
| δ90 |
4.098 |
| 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 |
07:18:36.07 |
-20:18:28.7 |
HIP 35413 |
10.69 |
| 2026-03-26 12:00 |
07:18:35.52 |
-20:17:56.3 |
HIP 35413 |
10.18 |
| 2026-03-27 00:00 |
07:18:35.00 |
-20:17:24.0 |
HIP 35413 |
9.66 |
| 2026-03-27 12:00 |
07:18:34.51 |
-20:16:51.6 |
HIP 35413 |
9.15 |
| 2026-03-28 00:00 |
07:18:34.04 |
-20:16:19.2 |
HIP 35413 |
8.64 |
| 2026-03-28 12:00 |
07:18:33.60 |
-20:15:46.9 |
HIP 35413 |
8.13 |
| 2026-03-29 00:00 |
07:18:33.19 |
-20:15:14.5 |
HIP 35413 |
7.63 |
| 2026-03-29 12:00 |
07:18:32.80 |
-20:14:42.1 |
HIP 35413 |
7.14 |
| 2026-03-30 00:00 |
07:18:32.44 |
-20:14:09.8 |
HIP 35413 |
6.65 |
| 2026-03-30 12:00 |
07:18:32.10 |
-20:13:37.5 |
HIP 35413 |
6.17 |
| 2026-03-31 00:00 |
07:18:31.79 |
-20:13:05.1 |
HIP 35413 |
5.69 |
| 2026-03-31 12:00 |
07:18:31.51 |
-20:12:32.8 |
HIP 35413 |
5.23 |
| 2026-04-01 00:00 |
07:18:31.25 |
-20:12:00.5 |
HIP 35413 |
4.79 |
| 2026-04-01 12:00 |
07:18:31.02 |
-20:11:28.2 |
HIP 35413 |
4.36 |
| 2026-04-02 00:00 |
07:18:30.81 |
-20:10:56.0 |
HIP 35413 |
3.96 |
| 2026-04-02 12:00 |
07:18:30.63 |
-20:10:23.7 |
HIP 35413 |
3.58 |
| 2026-04-03 00:00 |
07:18:30.48 |
-20:09:51.5 |
HIP 35413 |
3.25 |
| 2026-04-03 12:00 |
07:18:30.35 |
-20:09:19.3 |
HIP 35413 |
2.98 |
| 2026-04-04 00:00 |
07:18:30.25 |
-20:08:47.2 |
HIP 35413 |
2.78 |
| 2026-04-04 12:00 |
07:18:30.18 |
-20:08:15.0 |
HIP 35413 |
2.67 |
| 2026-04-05 00:00 |
07:18:30.13 |
-20:07:42.9 |
HIP 35413 |
2.65 |
| 2026-04-05 12:00 |
07:18:30.11 |
-20:07:10.9 |
HIP 35413 |
2.74 |
| 2026-04-06 00:00 |
07:18:30.11 |
-20:06:38.8 |
HIP 35413 |
2.91 |
| 2026-04-06 12:00 |
07:18:30.14 |
-20:06:06.8 |
HIP 35413 |
3.17 |
| 2026-04-07 00:00 |
07:18:30.20 |
-20:05:34.9 |
HIP 35413 |
3.48 |
| 2026-04-07 12:00 |
07:18:30.28 |
-20:05:03.0 |
HIP 35413 |
3.83 |
| 2026-04-08 00:00 |
07:18:30.39 |
-20:04:31.1 |
HIP 35413 |
4.22 |
| 2026-04-08 12:00 |
07:18:30.52 |
-20:03:59.3 |
HIP 35413 |
4.64 |
| 2026-04-09 00:00 |
07:18:30.69 |
-20:03:27.5 |
HIP 35413 |
5.07 |
| 2026-04-09 12:00 |
07:18:30.87 |
-20:02:55.8 |
HIP 35413 |
5.51 |
| 2026-04-10 00:00 |
07:18:31.08 |
-20:02:24.1 |
HIP 35413 |
5.97 |
| 2026-04-10 12:00 |
07:18:31.32 |
-20:01:52.5 |
HIP 35413 |
6.43 |
| 2026-04-11 00:00 |
07:18:31.59 |
-20:01:21.0 |
HIP 35413 |
6.90 |
| 2026-04-11 12:00 |
07:18:31.88 |
-20:00:49.5 |
HIP 35413 |
7.38 |
| 2026-04-12 00:00 |
07:18:32.20 |
-20:00:18.0 |
HIP 35413 |
7.86 |
| 2026-04-12 12:00 |
07:18:32.54 |
-19:59:46.7 |
HIP 35413 |
8.34 |
| 2026-04-13 00:00 |
07:18:32.91 |
-19:59:15.4 |
HIP 35413 |
8.83 |
| 2026-04-13 12:00 |
07:18:33.30 |
-19:58:44.1 |
HIP 35413 |
9.32 |
| 2026-04-14 00:00 |
07:18:33.72 |
-19:58:13.0 |
HIP 35413 |
9.81 |
| 2026-04-14 12:00 |
07:18:34.17 |
-19:57:41.9 |
HIP 35413 |
10.30 |
| 2026-04-15 00:00 |
07:18:34.64 |
-19:57:10.8 |
HIP 35413 |
10.79 |
| 2026-04-15 12:00 |
07:18:35.14 |
-19:56:39.9 |
HIP 35413 |
11.29 |
| 2026-04-16 00:00 |
07:18:35.66 |
-19:56:09.0 |
HIP 35413 |
11.78 |