| Parameter |
Value |
| Designation |
498P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-12-19T02:34:38.876160Z |
| Orbit solution date (soln_date, UTC) |
2025-04-11T14:45:22Z |
| Obs used |
368 |
| NEO |
- |
| M1 |
6.200 |
| K1 |
40.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2015-02-13T02:33:34.560000Z |
| Discovery magnitude (MPC) |
19.90 r |
| Discovery observatory (MPC) |
G45 · Space Surveillance Telescope, Atom Site |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2024-02-04.0000000 |
| e |
0.57239000 |
| q (au) |
1.963512 |
| a (au) |
4.591829 |
| i (deg) |
14.479162 |
| Ω (om, deg) |
279.253586 |
| ω (w, deg) |
179.143815 |
| M (ma, deg) |
328.035909 |
Magnitude
Scatter + Global Linear
$$
M_a = (18.691 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
18.691 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.685 |
| k |
0.800 |
| δ90 |
10.000 |
| 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 |
14:21:02.03 |
-24:26:58.8 |
HIP 70092 |
6.86 |
| 2026-09-20 12:00 |
14:21:27.83 |
-24:28:07.9 |
HIP 70092 |
12.02 |
| 2026-09-21 00:00 |
14:21:53.69 |
-24:29:17.4 |
HIP 70092 |
17.73 |
| 2026-09-21 12:00 |
14:22:19.61 |
-24:30:27.4 |
HIP 70092 |
23.58 |
| 2026-09-22 00:00 |
14:22:45.59 |
-24:31:37.9 |
HIP 70092 |
29.52 |
| 2026-09-22 12:00 |
14:23:11.63 |
-24:32:48.8 |
HIP 70469 |
26.98 |
| 2026-09-23 00:00 |
14:23:37.72 |
-24:34:00.2 |
HIP 70469 |
21.59 |
| 2026-09-23 12:00 |
14:24:03.87 |
-24:35:11.9 |
HIP 70469 |
16.65 |
| 2026-09-24 00:00 |
14:24:30.07 |
-24:36:24.2 |
HIP 70469 |
12.70 |
| 2026-09-24 12:00 |
14:24:56.33 |
-24:37:36.8 |
HIP 70469 |
10.90 |
| 2026-09-25 00:00 |
14:25:22.64 |
-24:38:49.8 |
HIP 70469 |
12.27 |
| 2026-09-25 12:00 |
14:25:49.01 |
-24:40:03.3 |
HIP 70469 |
16.03 |
| 2026-09-26 00:00 |
14:26:15.43 |
-24:41:17.2 |
HIP 70469 |
20.94 |
| 2026-09-26 12:00 |
14:26:41.90 |
-24:42:31.4 |
HIP 70469 |
26.36 |
| 2026-09-27 00:00 |
14:27:08.42 |
-24:43:46.1 |
HIP 70777 |
26.18 |
| 2026-09-27 12:00 |
14:27:34.99 |
-24:45:01.1 |
HIP 70777 |
23.37 |
| 2026-09-28 00:00 |
14:28:01.62 |
-24:46:16.6 |
HIP 70777 |
21.98 |
| 2026-09-28 12:00 |
14:28:28.29 |
-24:47:32.4 |
HIP 70777 |
22.29 |
| 2026-09-29 00:00 |
14:28:55.01 |
-24:48:48.6 |
HIP 70777 |
24.25 |
| 2026-09-29 12:00 |
14:29:21.79 |
-24:50:05.1 |
HIP 70777 |
27.50 |
| 2026-09-30 00:00 |
14:29:48.61 |
-24:51:22.1 |
HIP 70777 |
31.67 |
| 2026-09-30 12:00 |
14:30:15.48 |
-24:52:39.3 |
HIP 70972 |
28.17 |
| 2026-10-01 00:00 |
14:30:42.40 |
-24:53:57.0 |
HIP 71045 |
25.14 |
| 2026-10-01 12:00 |
14:31:09.36 |
-24:55:14.9 |
HIP 71045 |
23.33 |
| 2026-10-02 00:00 |
14:31:36.37 |
-24:56:33.3 |
HIP 71045 |
23.14 |
| 2026-10-02 12:00 |
14:32:03.43 |
-24:57:51.9 |
HIP 71045 |
24.61 |
| 2026-10-03 00:00 |
14:32:30.53 |
-24:59:10.9 |
HIP 71045 |
27.48 |
| 2026-10-03 12:00 |
14:32:57.67 |
-25:00:30.3 |
HIP 71045 |
31.37 |
| 2026-10-04 00:00 |
14:33:24.87 |
-25:01:49.9 |
HIP 71045 |
35.96 |
| 2026-10-04 12:00 |
14:33:52.10 |
-25:03:09.9 |
HIP 71414 |
32.72 |
| 2026-10-05 00:00 |
14:34:19.38 |
-25:04:30.2 |
HIP 71414 |
26.43 |
| 2026-10-05 12:00 |
14:34:46.70 |
-25:05:50.8 |
HIP 71414 |
20.15 |
| 2026-10-06 00:00 |
14:35:14.06 |
-25:07:11.7 |
HIP 71414 |
13.90 |
| 2026-10-06 12:00 |
14:35:41.47 |
-25:08:32.9 |
HIP 71414 |
7.80 |
| 2026-10-07 00:00 |
14:36:08.91 |
-25:09:54.4 |
HIP 71414 |
3.02 |
| 2026-10-07 12:00 |
14:36:36.40 |
-25:11:16.2 |
HIP 71414 |
6.20 |
| 2026-10-08 00:00 |
14:37:03.92 |
-25:12:38.3 |
HIP 71414 |
12.20 |
| 2026-10-08 12:00 |
14:37:31.48 |
-25:14:00.6 |
HIP 71414 |
18.47 |
| 2026-10-09 00:00 |
14:37:59.09 |
-25:15:23.3 |
HIP 71652 |
23.22 |
| 2026-10-09 12:00 |
14:38:26.72 |
-25:16:46.2 |
HIP 71652 |
19.57 |
| 2026-10-10 00:00 |
14:38:54.40 |
-25:18:09.3 |
HIP 71652 |
17.59 |
| 2026-10-10 12:00 |
14:39:22.11 |
-25:19:32.8 |
HIP 71652 |
17.83 |
| 2026-10-11 00:00 |
14:39:49.85 |
-25:20:56.4 |
HIP 71652 |
20.23 |