| Parameter |
Value |
| Designation |
C/2004 Q1 (Tucker) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2004-12-06T20:45:50.109120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:42Z |
| Obs used |
1972 |
| NEO |
- |
| M1 |
9.600 |
| K1 |
8.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2004-12-11.0000000 |
| e |
0.98903967 |
| q (au) |
2.046725 |
| a (au) |
186.739317 |
| i (deg) |
56.087689 |
| Ω (om, deg) |
22.130171 |
| ω (w, deg) |
32.968497 |
| M (ma, deg) |
0.001597 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.734 + 2.282\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.734 |
| n |
2.282 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2004-08-22 |
2004-12-06 |
+30.5056 |
-10.718 |
| 2004-12-06 |
2006-04-29 |
+3.6226 |
-2.377 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
13:30:43.34 |
-17:09:00.6 |
HIP 66078 |
46.82 |
| 2026-03-26 12:00 |
13:30:40.61 |
-17:08:49.4 |
HIP 66078 |
47.38 |
| 2026-03-27 00:00 |
13:30:37.87 |
-17:08:38.1 |
HIP 66078 |
47.94 |
| 2026-03-27 12:00 |
13:30:35.12 |
-17:08:26.6 |
HIP 65939 |
47.86 |
| 2026-03-28 00:00 |
13:30:32.36 |
-17:08:15.1 |
HIP 65939 |
47.77 |
| 2026-03-28 12:00 |
13:30:29.59 |
-17:08:03.5 |
HIP 65939 |
47.70 |
| 2026-03-29 00:00 |
13:30:26.82 |
-17:07:51.8 |
HIP 65939 |
47.63 |
| 2026-03-29 12:00 |
13:30:24.04 |
-17:07:40.0 |
HIP 65939 |
47.58 |
| 2026-03-30 00:00 |
13:30:21.25 |
-17:07:28.1 |
HIP 65939 |
47.53 |
| 2026-03-30 12:00 |
13:30:18.46 |
-17:07:16.1 |
HIP 65939 |
47.49 |
| 2026-03-31 00:00 |
13:30:15.66 |
-17:07:04.0 |
HIP 65939 |
47.46 |
| 2026-03-31 12:00 |
13:30:12.85 |
-17:06:51.8 |
HIP 65939 |
47.44 |
| 2026-04-01 00:00 |
13:30:10.04 |
-17:06:39.6 |
HIP 65939 |
47.43 |
| 2026-04-01 12:00 |
13:30:07.22 |
-17:06:27.2 |
HIP 65939 |
47.43 |
| 2026-04-02 00:00 |
13:30:04.40 |
-17:06:14.8 |
HIP 65939 |
47.43 |
| 2026-04-02 12:00 |
13:30:01.57 |
-17:06:02.3 |
HIP 65939 |
47.45 |
| 2026-04-03 00:00 |
13:29:58.73 |
-17:05:49.7 |
HIP 65939 |
47.48 |
| 2026-04-03 12:00 |
13:29:55.89 |
-17:05:37.0 |
HIP 65939 |
47.52 |
| 2026-04-04 00:00 |
13:29:53.05 |
-17:05:24.3 |
HIP 65939 |
47.56 |
| 2026-04-04 12:00 |
13:29:50.20 |
-17:05:11.4 |
HIP 65939 |
47.62 |
| 2026-04-05 00:00 |
13:29:47.35 |
-17:04:58.5 |
HIP 65939 |
47.69 |
| 2026-04-05 12:00 |
13:29:44.49 |
-17:04:45.5 |
HIP 65939 |
47.76 |
| 2026-04-06 00:00 |
13:29:41.63 |
-17:04:32.4 |
HIP 65939 |
47.85 |
| 2026-04-06 12:00 |
13:29:38.77 |
-17:04:19.3 |
HIP 65939 |
47.95 |
| 2026-04-07 00:00 |
13:29:35.90 |
-17:04:06.1 |
HIP 65939 |
48.05 |
| 2026-04-07 12:00 |
13:29:33.03 |
-17:03:52.8 |
HIP 65939 |
48.17 |
| 2026-04-08 00:00 |
13:29:30.15 |
-17:03:39.4 |
HIP 65939 |
48.29 |
| 2026-04-08 12:00 |
13:29:27.28 |
-17:03:26.0 |
HIP 65939 |
48.43 |
| 2026-04-09 00:00 |
13:29:24.40 |
-17:03:12.5 |
HIP 65939 |
48.57 |
| 2026-04-09 12:00 |
13:29:21.51 |
-17:02:58.9 |
HIP 65532 |
48.08 |
| 2026-04-10 00:00 |
13:29:18.63 |
-17:02:45.3 |
HIP 65532 |
47.36 |
| 2026-04-10 12:00 |
13:29:15.74 |
-17:02:31.6 |
HIP 65532 |
46.63 |
| 2026-04-11 00:00 |
13:29:12.86 |
-17:02:17.8 |
HIP 65532 |
45.91 |
| 2026-04-11 12:00 |
13:29:09.97 |
-17:02:04.0 |
HIP 65532 |
45.18 |
| 2026-04-12 00:00 |
13:29:07.08 |
-17:01:50.1 |
HIP 65532 |
44.46 |
| 2026-04-12 12:00 |
13:29:04.19 |
-17:01:36.2 |
HIP 65532 |
43.73 |
| 2026-04-13 00:00 |
13:29:01.30 |
-17:01:22.2 |
HIP 65532 |
43.01 |
| 2026-04-13 12:00 |
13:28:58.41 |
-17:01:08.1 |
HIP 65532 |
42.28 |
| 2026-04-14 00:00 |
13:28:55.51 |
-17:00:54.0 |
HIP 65532 |
41.55 |
| 2026-04-14 12:00 |
13:28:52.62 |
-17:00:39.8 |
HIP 65532 |
40.83 |
| 2026-04-15 00:00 |
13:28:49.73 |
-17:00:25.6 |
HIP 65532 |
40.10 |
| 2026-04-15 12:00 |
13:28:46.84 |
-17:00:11.3 |
HIP 65532 |
39.37 |
| 2026-04-16 00:00 |
13:28:43.95 |
-16:59:57.0 |
HIP 65532 |
38.65 |