| Parameter |
Value |
| Designation |
C/1996 Q1 (Tabur) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1996-11-03T12:46:28.758720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:49Z |
| Obs used |
214 |
| NEO |
- |
| M1 |
11.000 |
| K1 |
10.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1996-09-15.0000000 |
| e |
0.99861194 |
| q (au) |
0.839803 |
| a (au) |
605.019223 |
| i (deg) |
73.355632 |
| Ω (om, deg) |
31.399626 |
| ω (w, deg) |
57.412892 |
| M (ma, deg) |
359.996720 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.550 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.550 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
1.000 |
| 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 |
| 1996-08-21 |
1996-09-14 |
+20.1110 |
-2.149 |
| 1996-09-14 |
1996-10-11 |
-2.1380 |
-0.247 |
| 1996-10-11 |
1996-11-03 |
-32.9959 |
-1.069 |
| 1996-11-03 |
1997-10-05 |
-3.4416 |
+1.689 |
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 |
13:32:40.16 |
-54:36:51.2 |
HIP 65988 |
9.82 |
| 2026-07-29 12:00 |
13:32:40.85 |
-54:36:30.7 |
HIP 65988 |
9.69 |
| 2026-07-30 00:00 |
13:32:41.57 |
-54:36:10.3 |
HIP 65988 |
9.58 |
| 2026-07-30 12:00 |
13:32:42.32 |
-54:35:50.1 |
HIP 65988 |
9.48 |
| 2026-07-31 00:00 |
13:32:43.10 |
-54:35:29.9 |
HIP 65988 |
9.40 |
| 2026-07-31 12:00 |
13:32:43.90 |
-54:35:09.9 |
HIP 65988 |
9.34 |
| 2026-08-01 00:00 |
13:32:44.74 |
-54:34:49.9 |
HIP 65988 |
9.30 |
| 2026-08-01 12:00 |
13:32:45.60 |
-54:34:30.2 |
HIP 65988 |
9.27 |
| 2026-08-02 00:00 |
13:32:46.49 |
-54:34:10.5 |
HIP 65988 |
9.27 |
| 2026-08-02 12:00 |
13:32:47.41 |
-54:33:50.9 |
HIP 65988 |
9.28 |
| 2026-08-03 00:00 |
13:32:48.36 |
-54:33:31.5 |
HIP 66126 |
8.99 |
| 2026-08-03 12:00 |
13:32:49.34 |
-54:33:12.2 |
HIP 66126 |
8.64 |
| 2026-08-04 00:00 |
13:32:50.34 |
-54:32:53.0 |
HIP 66126 |
8.29 |
| 2026-08-04 12:00 |
13:32:51.38 |
-54:32:34.0 |
HIP 66126 |
7.94 |
| 2026-08-05 00:00 |
13:32:52.44 |
-54:32:15.1 |
HIP 66126 |
7.60 |
| 2026-08-05 12:00 |
13:32:53.53 |
-54:31:56.3 |
HIP 66126 |
7.25 |
| 2026-08-06 00:00 |
13:32:54.65 |
-54:31:37.7 |
HIP 66126 |
6.90 |
| 2026-08-06 12:00 |
13:32:55.80 |
-54:31:19.2 |
HIP 66126 |
6.55 |
| 2026-08-07 00:00 |
13:32:56.97 |
-54:31:00.8 |
HIP 66126 |
6.20 |
| 2026-08-07 12:00 |
13:32:58.18 |
-54:30:42.6 |
HIP 66126 |
5.85 |
| 2026-08-08 00:00 |
13:32:59.41 |
-54:30:24.5 |
HIP 66126 |
5.50 |
| 2026-08-08 12:00 |
13:33:00.66 |
-54:30:06.5 |
HIP 66126 |
5.15 |
| 2026-08-09 00:00 |
13:33:01.95 |
-54:29:48.7 |
HIP 66126 |
4.80 |
| 2026-08-09 12:00 |
13:33:03.26 |
-54:29:31.1 |
HIP 66126 |
4.45 |
| 2026-08-10 00:00 |
13:33:04.60 |
-54:29:13.6 |
HIP 66126 |
4.10 |
| 2026-08-10 12:00 |
13:33:05.97 |
-54:28:56.2 |
HIP 66126 |
3.75 |
| 2026-08-11 00:00 |
13:33:07.37 |
-54:28:39.0 |
HIP 66126 |
3.40 |
| 2026-08-11 12:00 |
13:33:08.79 |
-54:28:21.9 |
HIP 66126 |
3.05 |
| 2026-08-12 00:00 |
13:33:10.24 |
-54:28:05.0 |
HIP 66126 |
2.70 |
| 2026-08-12 12:00 |
13:33:11.72 |
-54:27:48.2 |
HIP 66126 |
2.34 |
| 2026-08-13 00:00 |
13:33:13.22 |
-54:27:31.6 |
HIP 66126 |
1.99 |
| 2026-08-13 12:00 |
13:33:14.75 |
-54:27:15.1 |
HIP 66126 |
1.64 |
| 2026-08-14 00:00 |
13:33:16.31 |
-54:26:58.8 |
HIP 66126 |
1.29 |
| 2026-08-14 12:00 |
13:33:17.89 |
-54:26:42.6 |
HIP 66126 |
0.94 |
| 2026-08-15 00:00 |
13:33:19.50 |
-54:26:26.6 |
HIP 66126 |
0.60 |
| 2026-08-15 12:00 |
13:33:21.13 |
-54:26:10.8 |
HIP 66126 |
0.29 |
| 2026-08-16 00:00 |
13:33:22.79 |
-54:25:55.1 |
HIP 66126 |
0.26 |
| 2026-08-16 12:00 |
13:33:24.48 |
-54:25:39.6 |
HIP 66126 |
0.56 |
| 2026-08-17 00:00 |
13:33:26.19 |
-54:25:24.2 |
HIP 66126 |
0.90 |
| 2026-08-17 12:00 |
13:33:27.93 |
-54:25:09.0 |
HIP 66126 |
1.25 |
| 2026-08-18 00:00 |
13:33:29.70 |
-54:24:54.0 |
HIP 66126 |
1.60 |
| 2026-08-18 12:00 |
13:33:31.49 |
-54:24:39.2 |
HIP 66126 |
1.96 |
| 2026-08-19 00:00 |
13:33:33.30 |
-54:24:24.5 |
HIP 66126 |
2.32 |