| 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
$$
M_a = (9.739 + 2.248\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.739 |
| n |
2.248 |
| gf |
1.000 |
| gb |
-0.999 |
| 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 |
+31.1170 |
-10.936 |
| 2004-12-06 |
2006-04-29 |
+3.5317 |
-2.323 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
13:23:35.04 |
-16:23:37.2 |
HIP 65344 |
16.34 |
| 2026-07-29 12:00 |
13:23:35.73 |
-16:23:37.5 |
HIP 65344 |
16.34 |
| 2026-07-30 00:00 |
13:23:36.45 |
-16:23:38.1 |
HIP 65344 |
16.34 |
| 2026-07-30 12:00 |
13:23:37.19 |
-16:23:38.7 |
HIP 65344 |
16.34 |
| 2026-07-31 00:00 |
13:23:37.95 |
-16:23:39.6 |
HIP 65344 |
16.34 |
| 2026-07-31 12:00 |
13:23:38.73 |
-16:23:40.5 |
HIP 65344 |
16.33 |
| 2026-08-01 00:00 |
13:23:39.54 |
-16:23:41.6 |
HIP 65344 |
16.33 |
| 2026-08-01 12:00 |
13:23:40.37 |
-16:23:42.8 |
HIP 65344 |
16.33 |
| 2026-08-02 00:00 |
13:23:41.22 |
-16:23:44.2 |
HIP 65344 |
16.33 |
| 2026-08-02 12:00 |
13:23:42.09 |
-16:23:45.7 |
HIP 65344 |
16.33 |
| 2026-08-03 00:00 |
13:23:42.98 |
-16:23:47.4 |
HIP 65344 |
16.33 |
| 2026-08-03 12:00 |
13:23:43.90 |
-16:23:49.2 |
HIP 65344 |
16.34 |
| 2026-08-04 00:00 |
13:23:44.83 |
-16:23:51.1 |
HIP 65344 |
16.34 |
| 2026-08-04 12:00 |
13:23:45.79 |
-16:23:53.2 |
HIP 65344 |
16.35 |
| 2026-08-05 00:00 |
13:23:46.77 |
-16:23:55.4 |
HIP 65344 |
16.36 |
| 2026-08-05 12:00 |
13:23:47.77 |
-16:23:57.7 |
HIP 65344 |
16.37 |
| 2026-08-06 00:00 |
13:23:48.80 |
-16:24:00.2 |
HIP 65344 |
16.38 |
| 2026-08-06 12:00 |
13:23:49.84 |
-16:24:02.9 |
HIP 65344 |
16.40 |
| 2026-08-07 00:00 |
13:23:50.91 |
-16:24:05.6 |
HIP 65344 |
16.41 |
| 2026-08-07 12:00 |
13:23:52.00 |
-16:24:08.6 |
HIP 65344 |
16.44 |
| 2026-08-08 00:00 |
13:23:53.10 |
-16:24:11.6 |
HIP 65344 |
16.46 |
| 2026-08-08 12:00 |
13:23:54.23 |
-16:24:14.8 |
HIP 65344 |
16.49 |
| 2026-08-09 00:00 |
13:23:55.39 |
-16:24:18.2 |
HIP 65344 |
16.52 |
| 2026-08-09 12:00 |
13:23:56.56 |
-16:24:21.6 |
HIP 65344 |
16.56 |
| 2026-08-10 00:00 |
13:23:57.75 |
-16:24:25.3 |
HIP 65344 |
16.60 |
| 2026-08-10 12:00 |
13:23:58.97 |
-16:24:29.0 |
HIP 65344 |
16.65 |
| 2026-08-11 00:00 |
13:24:00.20 |
-16:24:32.9 |
HIP 65344 |
16.70 |
| 2026-08-11 12:00 |
13:24:01.46 |
-16:24:37.0 |
HIP 65344 |
16.76 |
| 2026-08-12 00:00 |
13:24:02.73 |
-16:24:41.1 |
HIP 65344 |
16.82 |
| 2026-08-12 12:00 |
13:24:04.03 |
-16:24:45.4 |
HIP 65344 |
16.89 |
| 2026-08-13 00:00 |
13:24:05.35 |
-16:24:49.9 |
HIP 65344 |
16.96 |
| 2026-08-13 12:00 |
13:24:06.68 |
-16:24:54.5 |
HIP 65344 |
17.04 |
| 2026-08-14 00:00 |
13:24:08.04 |
-16:24:59.2 |
HIP 65344 |
17.13 |
| 2026-08-14 12:00 |
13:24:09.42 |
-16:25:04.1 |
HIP 65344 |
17.22 |
| 2026-08-15 00:00 |
13:24:10.82 |
-16:25:09.1 |
HIP 65344 |
17.32 |
| 2026-08-15 12:00 |
13:24:12.24 |
-16:25:14.3 |
HIP 65344 |
17.43 |
| 2026-08-16 00:00 |
13:24:13.67 |
-16:25:19.5 |
HIP 65344 |
17.54 |
| 2026-08-16 12:00 |
13:24:15.13 |
-16:25:25.0 |
HIP 65344 |
17.66 |
| 2026-08-17 00:00 |
13:24:16.61 |
-16:25:30.5 |
HIP 65344 |
17.79 |
| 2026-08-17 12:00 |
13:24:18.10 |
-16:25:36.2 |
HIP 65344 |
17.92 |
| 2026-08-18 00:00 |
13:24:19.62 |
-16:25:42.0 |
HIP 65344 |
18.07 |
| 2026-08-18 12:00 |
13:24:21.16 |
-16:25:48.0 |
HIP 65344 |
18.22 |
| 2026-08-19 00:00 |
13:24:22.71 |
-16:25:54.1 |
HIP 65344 |
18.38 |