| Parameter |
Value |
| Designation |
C/1999 T3 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-08-30T08:59:22.329600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:02Z |
| Obs used |
227 |
| NEO |
- |
| M1 |
10.800 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2000-02-09.0000000 |
| e |
1.00305659 |
| q (au) |
5.368403 |
| a (au) |
-1756.337617 |
| i (deg) |
104.759114 |
| Ω (om, deg) |
223.515431 |
| ω (w, deg) |
211.096887 |
| M (ma, deg) |
-0.002723 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.494 + 4.236\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.494 |
| n |
4.236 |
| gf |
0.998 |
| gb |
-0.963 |
| k |
1.000 |
| δ90 |
9.999 |
| 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) |
| 2026-05-12 00:00 |
14:41:40.87 |
-25:14:43.5 |
HIP 71970 |
21.75 |
| 2026-05-12 12:00 |
14:41:38.04 |
-25:14:27.4 |
HIP 71970 |
22.25 |
| 2026-05-13 00:00 |
14:41:35.20 |
-25:14:11.2 |
HIP 71970 |
22.76 |
| 2026-05-13 12:00 |
14:41:32.38 |
-25:13:55.1 |
HIP 71970 |
23.28 |
| 2026-05-14 00:00 |
14:41:29.56 |
-25:13:38.8 |
HIP 71970 |
23.81 |
| 2026-05-14 12:00 |
14:41:26.74 |
-25:13:22.6 |
HIP 71970 |
24.34 |
| 2026-05-15 00:00 |
14:41:23.93 |
-25:13:06.3 |
HIP 71970 |
24.88 |
| 2026-05-15 12:00 |
14:41:21.12 |
-25:12:49.9 |
HIP 71970 |
25.43 |
| 2026-05-16 00:00 |
14:41:18.32 |
-25:12:33.5 |
HIP 71970 |
25.98 |
| 2026-05-16 12:00 |
14:41:15.52 |
-25:12:17.1 |
HIP 71970 |
26.54 |
| 2026-05-17 00:00 |
14:41:12.73 |
-25:12:00.7 |
HIP 71970 |
27.10 |
| 2026-05-17 12:00 |
14:41:09.94 |
-25:11:44.2 |
HIP 71652 |
26.41 |
| 2026-05-18 00:00 |
14:41:07.17 |
-25:11:27.7 |
HIP 71652 |
25.73 |
| 2026-05-18 12:00 |
14:41:04.40 |
-25:11:11.1 |
HIP 71652 |
25.04 |
| 2026-05-19 00:00 |
14:41:01.63 |
-25:10:54.5 |
HIP 71652 |
24.36 |
| 2026-05-19 12:00 |
14:40:58.87 |
-25:10:37.9 |
HIP 71652 |
23.68 |
| 2026-05-20 00:00 |
14:40:56.12 |
-25:10:21.3 |
HIP 71652 |
23.00 |
| 2026-05-20 12:00 |
14:40:53.38 |
-25:10:04.6 |
HIP 71652 |
22.32 |
| 2026-05-21 00:00 |
14:40:50.65 |
-25:09:48.0 |
HIP 71652 |
21.64 |
| 2026-05-21 12:00 |
14:40:47.92 |
-25:09:31.2 |
HIP 71652 |
20.96 |
| 2026-05-22 00:00 |
14:40:45.20 |
-25:09:14.5 |
HIP 71652 |
20.29 |
| 2026-05-22 12:00 |
14:40:42.49 |
-25:08:57.8 |
HIP 71652 |
19.61 |
| 2026-05-23 00:00 |
14:40:39.79 |
-25:08:41.0 |
HIP 71652 |
18.94 |
| 2026-05-23 12:00 |
14:40:37.09 |
-25:08:24.2 |
HIP 71652 |
18.27 |
| 2026-05-24 00:00 |
14:40:34.41 |
-25:08:07.4 |
HIP 71652 |
17.60 |
| 2026-05-24 12:00 |
14:40:31.73 |
-25:07:50.5 |
HIP 71652 |
16.94 |
| 2026-05-25 00:00 |
14:40:29.07 |
-25:07:33.7 |
HIP 71652 |
16.27 |
| 2026-05-25 12:00 |
14:40:26.41 |
-25:07:16.8 |
HIP 71652 |
15.61 |
| 2026-05-26 00:00 |
14:40:23.76 |
-25:07:00.0 |
HIP 71652 |
14.95 |
| 2026-05-26 12:00 |
14:40:21.13 |
-25:06:43.0 |
HIP 71652 |
14.29 |
| 2026-05-27 00:00 |
14:40:18.50 |
-25:06:26.1 |
HIP 71652 |
13.64 |
| 2026-05-27 12:00 |
14:40:15.88 |
-25:06:09.2 |
HIP 71652 |
12.99 |
| 2026-05-28 00:00 |
14:40:13.27 |
-25:05:52.3 |
HIP 71652 |
12.34 |
| 2026-05-28 12:00 |
14:40:10.68 |
-25:05:35.4 |
HIP 71652 |
11.69 |
| 2026-05-29 00:00 |
14:40:08.09 |
-25:05:18.4 |
HIP 71652 |
11.04 |
| 2026-05-29 12:00 |
14:40:05.52 |
-25:05:01.5 |
HIP 71652 |
10.40 |
| 2026-05-30 00:00 |
14:40:02.96 |
-25:04:44.5 |
HIP 71652 |
9.76 |
| 2026-05-30 12:00 |
14:40:00.40 |
-25:04:27.5 |
HIP 71652 |
9.12 |
| 2026-05-31 00:00 |
14:39:57.86 |
-25:04:10.6 |
HIP 71652 |
8.49 |
| 2026-05-31 12:00 |
14:39:55.33 |
-25:03:53.6 |
HIP 71652 |
7.86 |
| 2026-06-01 00:00 |
14:39:52.82 |
-25:03:36.6 |
HIP 71652 |
7.23 |
| 2026-06-01 12:00 |
14:39:50.31 |
-25:03:19.7 |
HIP 71652 |
6.61 |
| 2026-06-02 00:00 |
14:39:47.82 |
-25:03:02.7 |
HIP 71652 |
6.00 |