| 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) |
| 2026-07-29 00:00 |
21:18:10.03 |
+11:48:19.7 |
HIP 105200 |
15.44 |
| 2026-07-29 12:00 |
21:18:07.89 |
+11:48:13.1 |
HIP 105200 |
15.55 |
| 2026-07-30 00:00 |
21:18:05.75 |
+11:48:06.5 |
HIP 105200 |
15.68 |
| 2026-07-30 12:00 |
21:18:03.61 |
+11:47:59.6 |
HIP 105200 |
15.83 |
| 2026-07-31 00:00 |
21:18:01.46 |
+11:47:52.7 |
HIP 105200 |
15.99 |
| 2026-07-31 12:00 |
21:17:59.31 |
+11:47:45.6 |
HIP 105200 |
16.17 |
| 2026-08-01 00:00 |
21:17:57.16 |
+11:47:38.3 |
HIP 105200 |
16.35 |
| 2026-08-01 12:00 |
21:17:55.00 |
+11:47:30.9 |
HIP 105200 |
16.56 |
| 2026-08-02 00:00 |
21:17:52.84 |
+11:47:23.4 |
HIP 105200 |
16.78 |
| 2026-08-02 12:00 |
21:17:50.68 |
+11:47:15.7 |
HIP 105200 |
17.01 |
| 2026-08-03 00:00 |
21:17:48.52 |
+11:47:07.9 |
HIP 105200 |
17.25 |
| 2026-08-03 12:00 |
21:17:46.35 |
+11:47:00.0 |
HIP 105200 |
17.51 |
| 2026-08-04 00:00 |
21:17:44.18 |
+11:46:51.8 |
HIP 105200 |
17.77 |
| 2026-08-04 12:00 |
21:17:42.01 |
+11:46:43.6 |
HIP 105200 |
18.05 |
| 2026-08-05 00:00 |
21:17:39.84 |
+11:46:35.2 |
HIP 105200 |
18.34 |
| 2026-08-05 12:00 |
21:17:37.67 |
+11:46:26.7 |
HIP 105200 |
18.64 |
| 2026-08-06 00:00 |
21:17:35.50 |
+11:46:18.0 |
HIP 105200 |
18.95 |
| 2026-08-06 12:00 |
21:17:33.32 |
+11:46:09.2 |
HIP 105200 |
19.27 |
| 2026-08-07 00:00 |
21:17:31.14 |
+11:46:00.2 |
HIP 105200 |
19.60 |
| 2026-08-07 12:00 |
21:17:28.96 |
+11:45:51.2 |
HIP 105200 |
19.94 |
| 2026-08-08 00:00 |
21:17:26.79 |
+11:45:42.0 |
HIP 105200 |
20.28 |
| 2026-08-08 12:00 |
21:17:24.61 |
+11:45:32.6 |
HIP 105200 |
20.64 |
| 2026-08-09 00:00 |
21:17:22.43 |
+11:45:23.1 |
HIP 105200 |
21.00 |
| 2026-08-09 12:00 |
21:17:20.25 |
+11:45:13.5 |
HIP 105200 |
21.37 |
| 2026-08-10 00:00 |
21:17:18.07 |
+11:45:03.7 |
HIP 105200 |
21.74 |
| 2026-08-10 12:00 |
21:17:15.89 |
+11:44:53.8 |
HIP 105200 |
22.13 |
| 2026-08-11 00:00 |
21:17:13.71 |
+11:44:43.8 |
HIP 105200 |
22.52 |
| 2026-08-11 12:00 |
21:17:11.53 |
+11:44:33.6 |
HIP 105200 |
22.91 |
| 2026-08-12 00:00 |
21:17:09.35 |
+11:44:23.4 |
HIP 105200 |
23.31 |
| 2026-08-12 12:00 |
21:17:07.17 |
+11:44:12.9 |
HIP 105200 |
23.72 |
| 2026-08-13 00:00 |
21:17:04.99 |
+11:44:02.4 |
HIP 104991 |
23.52 |
| 2026-08-13 12:00 |
21:17:02.82 |
+11:43:51.7 |
HIP 104991 |
23.00 |
| 2026-08-14 00:00 |
21:17:00.64 |
+11:43:40.9 |
HIP 104991 |
22.48 |
| 2026-08-14 12:00 |
21:16:58.47 |
+11:43:29.9 |
HIP 104991 |
21.96 |
| 2026-08-15 00:00 |
21:16:56.30 |
+11:43:18.9 |
HIP 104991 |
21.45 |
| 2026-08-15 12:00 |
21:16:54.13 |
+11:43:07.7 |
HIP 104991 |
20.93 |
| 2026-08-16 00:00 |
21:16:51.96 |
+11:42:56.4 |
HIP 104991 |
20.42 |
| 2026-08-16 12:00 |
21:16:49.80 |
+11:42:44.9 |
HIP 104991 |
19.91 |
| 2026-08-17 00:00 |
21:16:47.63 |
+11:42:33.3 |
HIP 104991 |
19.40 |
| 2026-08-17 12:00 |
21:16:45.47 |
+11:42:21.7 |
HIP 104991 |
18.89 |
| 2026-08-18 00:00 |
21:16:43.32 |
+11:42:09.8 |
HIP 104991 |
18.38 |
| 2026-08-18 12:00 |
21:16:41.16 |
+11:41:57.9 |
HIP 104991 |
17.88 |
| 2026-08-19 00:00 |
21:16:39.01 |
+11:41:45.9 |
HIP 104991 |
17.38 |