| Parameter |
Value |
| Designation |
C/1997 N1 (Tabur) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1997-08-15T11:29:17.433600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:51Z |
| Obs used |
65 |
| NEO |
- |
| M1 |
12.100 |
| K1 |
6.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1997-07-13.0000000 |
| e |
1.00016168 |
| q (au) |
0.395723 |
| a (au) |
-2447.496553 |
| i (deg) |
85.962975 |
| Ω (om, deg) |
147.610977 |
| ω (w, deg) |
344.181841 |
| M (ma, deg) |
-0.000273 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.434 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.434 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.920 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
21:14:34.71 |
+11:25:29.7 |
HIP 104991 |
19.23 |
| 2026-09-20 12:00 |
21:14:33.09 |
+11:25:12.0 |
HIP 104991 |
19.68 |
| 2026-09-21 00:00 |
21:14:31.47 |
+11:24:54.3 |
HIP 104991 |
20.12 |
| 2026-09-21 12:00 |
21:14:29.88 |
+11:24:36.6 |
HIP 104759 |
20.40 |
| 2026-09-22 00:00 |
21:14:28.29 |
+11:24:18.8 |
HIP 104759 |
19.91 |
| 2026-09-22 12:00 |
21:14:26.72 |
+11:24:00.9 |
HIP 104759 |
19.42 |
| 2026-09-23 00:00 |
21:14:25.16 |
+11:23:43.1 |
HIP 104759 |
18.94 |
| 2026-09-23 12:00 |
21:14:23.61 |
+11:23:25.1 |
HIP 104759 |
18.46 |
| 2026-09-24 00:00 |
21:14:22.08 |
+11:23:07.2 |
HIP 104759 |
17.98 |
| 2026-09-24 12:00 |
21:14:20.56 |
+11:22:49.2 |
HIP 104759 |
17.50 |
| 2026-09-25 00:00 |
21:14:19.06 |
+11:22:31.2 |
HIP 104759 |
17.02 |
| 2026-09-25 12:00 |
21:14:17.56 |
+11:22:13.1 |
HIP 104759 |
16.55 |
| 2026-09-26 00:00 |
21:14:16.09 |
+11:21:55.0 |
HIP 104759 |
16.08 |
| 2026-09-26 12:00 |
21:14:14.62 |
+11:21:36.9 |
HIP 104759 |
15.62 |
| 2026-09-27 00:00 |
21:14:13.18 |
+11:21:18.7 |
HIP 104759 |
15.15 |
| 2026-09-27 12:00 |
21:14:11.74 |
+11:21:00.5 |
HIP 104759 |
14.69 |
| 2026-09-28 00:00 |
21:14:10.32 |
+11:20:42.3 |
HIP 104759 |
14.23 |
| 2026-09-28 12:00 |
21:14:08.91 |
+11:20:24.1 |
HIP 104759 |
13.78 |
| 2026-09-29 00:00 |
21:14:07.52 |
+11:20:05.8 |
HIP 104759 |
13.32 |
| 2026-09-29 12:00 |
21:14:06.15 |
+11:19:47.5 |
HIP 104759 |
12.87 |
| 2026-09-30 00:00 |
21:14:04.78 |
+11:19:29.2 |
HIP 104759 |
12.43 |
| 2026-09-30 12:00 |
21:14:03.44 |
+11:19:10.9 |
HIP 104759 |
11.98 |
| 2026-10-01 00:00 |
21:14:02.11 |
+11:18:52.5 |
HIP 104759 |
11.54 |
| 2026-10-01 12:00 |
21:14:00.79 |
+11:18:34.1 |
HIP 104759 |
11.11 |
| 2026-10-02 00:00 |
21:13:59.49 |
+11:18:15.7 |
HIP 104759 |
10.67 |
| 2026-10-02 12:00 |
21:13:58.20 |
+11:17:57.3 |
HIP 104759 |
10.25 |
| 2026-10-03 00:00 |
21:13:56.93 |
+11:17:38.9 |
HIP 104759 |
9.82 |
| 2026-10-03 12:00 |
21:13:55.67 |
+11:17:20.4 |
HIP 104759 |
9.40 |
| 2026-10-04 00:00 |
21:13:54.43 |
+11:17:02.0 |
HIP 104759 |
8.98 |
| 2026-10-04 12:00 |
21:13:53.21 |
+11:16:43.5 |
HIP 104759 |
8.57 |
| 2026-10-05 00:00 |
21:13:52.00 |
+11:16:25.0 |
HIP 104759 |
8.17 |
| 2026-10-05 12:00 |
21:13:50.81 |
+11:16:06.6 |
HIP 104759 |
7.77 |
| 2026-10-06 00:00 |
21:13:49.63 |
+11:15:48.1 |
HIP 104759 |
7.38 |
| 2026-10-06 12:00 |
21:13:48.47 |
+11:15:29.6 |
HIP 104759 |
6.99 |
| 2026-10-07 00:00 |
21:13:47.33 |
+11:15:11.1 |
HIP 104759 |
6.61 |
| 2026-10-07 12:00 |
21:13:46.20 |
+11:14:52.6 |
HIP 104759 |
6.24 |
| 2026-10-08 00:00 |
21:13:45.09 |
+11:14:34.0 |
HIP 104759 |
5.88 |
| 2026-10-08 12:00 |
21:13:44.00 |
+11:14:15.5 |
HIP 104759 |
5.53 |
| 2026-10-09 00:00 |
21:13:42.92 |
+11:13:57.0 |
HIP 104759 |
5.20 |
| 2026-10-09 12:00 |
21:13:41.86 |
+11:13:38.5 |
HIP 104759 |
4.88 |
| 2026-10-10 00:00 |
21:13:40.81 |
+11:13:20.0 |
HIP 104759 |
4.57 |
| 2026-10-10 12:00 |
21:13:39.79 |
+11:13:01.5 |
HIP 104759 |
4.29 |
| 2026-10-11 00:00 |
21:13:38.78 |
+11:12:43.1 |
HIP 104759 |
4.03 |