| 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) |
| 2026-03-26 00:00 |
21:20:22.25 |
+11:10:08.8 |
HIP 105224 |
22.22 |
| 2026-03-26 12:00 |
21:20:23.75 |
+11:10:25.6 |
HIP 105224 |
22.57 |
| 2026-03-27 00:00 |
21:20:25.24 |
+11:10:42.4 |
HIP 105224 |
22.91 |
| 2026-03-27 12:00 |
21:20:26.71 |
+11:10:59.2 |
HIP 105224 |
23.26 |
| 2026-03-28 00:00 |
21:20:28.17 |
+11:11:16.1 |
HIP 105224 |
23.60 |
| 2026-03-28 12:00 |
21:20:29.62 |
+11:11:33.0 |
HIP 105224 |
23.95 |
| 2026-03-29 00:00 |
21:20:31.05 |
+11:11:49.9 |
HIP 105365 |
24.18 |
| 2026-03-29 12:00 |
21:20:32.47 |
+11:12:06.8 |
HIP 105365 |
23.90 |
| 2026-03-30 00:00 |
21:20:33.88 |
+11:12:23.7 |
HIP 105365 |
23.63 |
| 2026-03-30 12:00 |
21:20:35.27 |
+11:12:40.7 |
HIP 105365 |
23.36 |
| 2026-03-31 00:00 |
21:20:36.64 |
+11:12:57.7 |
HIP 105365 |
23.10 |
| 2026-03-31 12:00 |
21:20:38.00 |
+11:13:14.7 |
HIP 105365 |
22.84 |
| 2026-04-01 00:00 |
21:20:39.35 |
+11:13:31.7 |
HIP 105365 |
22.58 |
| 2026-04-01 12:00 |
21:20:40.68 |
+11:13:48.8 |
HIP 105365 |
22.33 |
| 2026-04-02 00:00 |
21:20:42.00 |
+11:14:05.8 |
HIP 105365 |
22.09 |
| 2026-04-02 12:00 |
21:20:43.30 |
+11:14:22.9 |
HIP 105365 |
21.85 |
| 2026-04-03 00:00 |
21:20:44.59 |
+11:14:40.0 |
HIP 105365 |
21.62 |
| 2026-04-03 12:00 |
21:20:45.86 |
+11:14:57.1 |
HIP 105365 |
21.39 |
| 2026-04-04 00:00 |
21:20:47.12 |
+11:15:14.2 |
HIP 105365 |
21.16 |
| 2026-04-04 12:00 |
21:20:48.36 |
+11:15:31.3 |
HIP 105365 |
20.94 |
| 2026-04-05 00:00 |
21:20:49.59 |
+11:15:48.4 |
HIP 105365 |
20.73 |
| 2026-04-05 12:00 |
21:20:50.80 |
+11:16:05.6 |
HIP 105365 |
20.52 |
| 2026-04-06 00:00 |
21:20:51.99 |
+11:16:22.7 |
HIP 105365 |
20.32 |
| 2026-04-06 12:00 |
21:20:53.17 |
+11:16:39.8 |
HIP 105365 |
20.12 |
| 2026-04-07 00:00 |
21:20:54.34 |
+11:16:57.0 |
HIP 105365 |
19.93 |
| 2026-04-07 12:00 |
21:20:55.49 |
+11:17:14.1 |
HIP 105365 |
19.74 |
| 2026-04-08 00:00 |
21:20:56.62 |
+11:17:31.3 |
HIP 105365 |
19.55 |
| 2026-04-08 12:00 |
21:20:57.74 |
+11:17:48.4 |
HIP 105365 |
19.38 |
| 2026-04-09 00:00 |
21:20:58.84 |
+11:18:05.6 |
HIP 105365 |
19.20 |
| 2026-04-09 12:00 |
21:20:59.92 |
+11:18:22.7 |
HIP 105365 |
19.04 |
| 2026-04-10 00:00 |
21:21:00.99 |
+11:18:39.9 |
HIP 105365 |
18.87 |
| 2026-04-10 12:00 |
21:21:02.05 |
+11:18:57.0 |
HIP 105365 |
18.72 |
| 2026-04-11 00:00 |
21:21:03.08 |
+11:19:14.2 |
HIP 105365 |
18.56 |
| 2026-04-11 12:00 |
21:21:04.10 |
+11:19:31.3 |
HIP 105365 |
18.42 |
| 2026-04-12 00:00 |
21:21:05.11 |
+11:19:48.4 |
HIP 105365 |
18.27 |
| 2026-04-12 12:00 |
21:21:06.09 |
+11:20:05.5 |
HIP 105365 |
18.13 |
| 2026-04-13 00:00 |
21:21:07.06 |
+11:20:22.6 |
HIP 105365 |
18.00 |
| 2026-04-13 12:00 |
21:21:08.02 |
+11:20:39.7 |
HIP 105365 |
17.87 |
| 2026-04-14 00:00 |
21:21:08.96 |
+11:20:56.8 |
HIP 105365 |
17.75 |
| 2026-04-14 12:00 |
21:21:09.88 |
+11:21:13.8 |
HIP 105365 |
17.63 |
| 2026-04-15 00:00 |
21:21:10.78 |
+11:21:30.9 |
HIP 105365 |
17.52 |
| 2026-04-15 12:00 |
21:21:11.67 |
+11:21:47.9 |
HIP 105365 |
17.41 |
| 2026-04-16 00:00 |
21:21:12.54 |
+11:22:04.9 |
HIP 105365 |
17.30 |