| 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) |
| 2026-05-12 00:00 |
13:26:20.44 |
-16:46:55.9 |
HIP 65532 |
5.71 |
| 2026-05-12 12:00 |
13:26:17.91 |
-16:46:40.8 |
HIP 65532 |
5.59 |
| 2026-05-13 00:00 |
13:26:15.40 |
-16:46:25.7 |
HIP 65532 |
5.54 |
| 2026-05-13 12:00 |
13:26:12.89 |
-16:46:10.7 |
HIP 65532 |
5.57 |
| 2026-05-14 00:00 |
13:26:10.40 |
-16:45:55.7 |
HIP 65532 |
5.68 |
| 2026-05-14 12:00 |
13:26:07.92 |
-16:45:40.7 |
HIP 65552 |
5.79 |
| 2026-05-15 00:00 |
13:26:05.46 |
-16:45:25.8 |
HIP 65552 |
5.88 |
| 2026-05-15 12:00 |
13:26:03.00 |
-16:45:10.9 |
HIP 65552 |
6.03 |
| 2026-05-16 00:00 |
13:26:00.56 |
-16:44:56.0 |
HIP 65552 |
6.25 |
| 2026-05-16 12:00 |
13:25:58.14 |
-16:44:41.1 |
HIP 65552 |
6.52 |
| 2026-05-17 00:00 |
13:25:55.73 |
-16:44:26.3 |
HIP 65552 |
6.83 |
| 2026-05-17 12:00 |
13:25:53.33 |
-16:44:11.5 |
HIP 65552 |
7.18 |
| 2026-05-18 00:00 |
13:25:50.94 |
-16:43:56.8 |
HIP 65552 |
7.57 |
| 2026-05-18 12:00 |
13:25:48.58 |
-16:43:42.1 |
HIP 65552 |
7.98 |
| 2026-05-19 00:00 |
13:25:46.22 |
-16:43:27.4 |
HIP 65552 |
8.41 |
| 2026-05-19 12:00 |
13:25:43.88 |
-16:43:12.7 |
HIP 65552 |
8.86 |
| 2026-05-20 00:00 |
13:25:41.56 |
-16:42:58.2 |
HIP 65552 |
9.33 |
| 2026-05-20 12:00 |
13:25:39.25 |
-16:42:43.6 |
HIP 65552 |
9.81 |
| 2026-05-21 00:00 |
13:25:36.95 |
-16:42:29.1 |
HIP 65552 |
10.30 |
| 2026-05-21 12:00 |
13:25:34.67 |
-16:42:14.6 |
HIP 65552 |
10.79 |
| 2026-05-22 00:00 |
13:25:32.41 |
-16:42:00.2 |
HIP 65552 |
11.30 |
| 2026-05-22 12:00 |
13:25:30.16 |
-16:41:45.9 |
HIP 65552 |
11.80 |
| 2026-05-23 00:00 |
13:25:27.93 |
-16:41:31.5 |
HIP 65552 |
12.32 |
| 2026-05-23 12:00 |
13:25:25.72 |
-16:41:17.3 |
HIP 65552 |
12.83 |
| 2026-05-24 00:00 |
13:25:23.52 |
-16:41:03.1 |
HIP 65552 |
13.34 |
| 2026-05-24 12:00 |
13:25:21.34 |
-16:40:48.9 |
HIP 65552 |
13.86 |
| 2026-05-25 00:00 |
13:25:19.17 |
-16:40:34.8 |
HIP 65552 |
14.38 |
| 2026-05-25 12:00 |
13:25:17.02 |
-16:40:20.7 |
HIP 65552 |
14.89 |
| 2026-05-26 00:00 |
13:25:14.89 |
-16:40:06.8 |
HIP 65552 |
15.41 |
| 2026-05-26 12:00 |
13:25:12.77 |
-16:39:52.8 |
HIP 65552 |
15.92 |
| 2026-05-27 00:00 |
13:25:10.68 |
-16:39:38.9 |
HIP 65552 |
16.44 |
| 2026-05-27 12:00 |
13:25:08.59 |
-16:39:25.1 |
HIP 65552 |
16.95 |
| 2026-05-28 00:00 |
13:25:06.53 |
-16:39:11.4 |
HIP 65552 |
17.46 |
| 2026-05-28 12:00 |
13:25:04.48 |
-16:38:57.7 |
HIP 65552 |
17.97 |
| 2026-05-29 00:00 |
13:25:02.46 |
-16:38:44.0 |
HIP 65552 |
18.47 |
| 2026-05-29 12:00 |
13:25:00.44 |
-16:38:30.5 |
HIP 65552 |
18.97 |
| 2026-05-30 00:00 |
13:24:58.45 |
-16:38:17.0 |
HIP 65552 |
19.47 |
| 2026-05-30 12:00 |
13:24:56.48 |
-16:38:03.5 |
HIP 65552 |
19.97 |
| 2026-05-31 00:00 |
13:24:54.52 |
-16:37:50.1 |
HIP 65344 |
19.56 |
| 2026-05-31 12:00 |
13:24:52.58 |
-16:37:36.8 |
HIP 65344 |
19.13 |
| 2026-06-01 00:00 |
13:24:50.66 |
-16:37:23.6 |
HIP 65344 |
18.70 |
| 2026-06-01 12:00 |
13:24:48.76 |
-16:37:10.4 |
HIP 65344 |
18.28 |
| 2026-06-02 00:00 |
13:24:46.87 |
-16:36:57.3 |
HIP 65344 |
17.87 |