| 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) |
| 2026-05-12 00:00 |
13:44:56.06 |
-28:24:52.2 |
HIP 67006 |
19.95 |
| 2026-05-12 12:00 |
13:44:38.42 |
-28:22:01.4 |
HIP 67006 |
20.15 |
| 2026-05-13 00:00 |
13:44:20.95 |
-28:19:10.2 |
HIP 67006 |
21.47 |
| 2026-05-13 12:00 |
13:44:03.67 |
-28:16:18.8 |
HIP 67006 |
23.70 |
| 2026-05-14 00:00 |
13:43:46.58 |
-28:13:27.1 |
HIP 67006 |
26.60 |
| 2026-05-14 12:00 |
13:43:29.69 |
-28:10:35.1 |
HIP 67006 |
29.97 |
| 2026-05-15 00:00 |
13:43:12.98 |
-28:07:43.0 |
HIP 66742 |
32.84 |
| 2026-05-15 12:00 |
13:42:56.48 |
-28:04:50.7 |
HIP 66742 |
30.09 |
| 2026-05-16 00:00 |
13:42:40.17 |
-28:01:58.2 |
HIP 66742 |
27.89 |
| 2026-05-16 12:00 |
13:42:24.06 |
-27:59:05.7 |
HIP 66742 |
26.35 |
| 2026-05-17 00:00 |
13:42:08.16 |
-27:56:13.1 |
HIP 66742 |
25.57 |
| 2026-05-17 12:00 |
13:41:52.47 |
-27:53:20.4 |
HIP 66742 |
25.61 |
| 2026-05-18 00:00 |
13:41:36.98 |
-27:50:27.7 |
HIP 66679 |
25.11 |
| 2026-05-18 12:00 |
13:41:21.71 |
-27:47:35.1 |
HIP 66679 |
20.68 |
| 2026-05-19 00:00 |
13:41:06.65 |
-27:44:42.5 |
HIP 66679 |
16.28 |
| 2026-05-19 12:00 |
13:40:51.80 |
-27:41:50.1 |
HIP 66679 |
11.92 |
| 2026-05-20 00:00 |
13:40:37.17 |
-27:38:57.7 |
HIP 66679 |
7.62 |
| 2026-05-20 12:00 |
13:40:22.76 |
-27:36:05.5 |
HIP 66679 |
3.41 |
| 2026-05-21 00:00 |
13:40:08.56 |
-27:33:13.5 |
HIP 66679 |
1.44 |
| 2026-05-21 12:00 |
13:39:54.59 |
-27:30:21.6 |
HIP 66679 |
5.33 |
| 2026-05-22 00:00 |
13:39:40.84 |
-27:27:30.0 |
HIP 66679 |
9.47 |
| 2026-05-22 12:00 |
13:39:27.32 |
-27:24:38.7 |
HIP 66571 |
13.14 |
| 2026-05-23 00:00 |
13:39:14.02 |
-27:21:47.7 |
HIP 66571 |
9.03 |
| 2026-05-23 12:00 |
13:39:00.95 |
-27:18:57.0 |
HIP 66571 |
4.97 |
| 2026-05-24 00:00 |
13:38:48.11 |
-27:16:06.7 |
HIP 66571 |
0.96 |
| 2026-05-24 12:00 |
13:38:35.49 |
-27:13:16.7 |
HIP 66571 |
3.05 |
| 2026-05-25 00:00 |
13:38:23.11 |
-27:10:27.1 |
HIP 66571 |
7.00 |
| 2026-05-25 12:00 |
13:38:10.95 |
-27:07:37.9 |
HIP 66571 |
10.90 |
| 2026-05-26 00:00 |
13:37:59.03 |
-27:04:49.2 |
HIP 66550 |
12.69 |
| 2026-05-26 12:00 |
13:37:47.34 |
-27:02:01.0 |
HIP 66550 |
12.42 |
| 2026-05-27 00:00 |
13:37:35.88 |
-26:59:13.3 |
HIP 66550 |
13.25 |
| 2026-05-27 12:00 |
13:37:24.66 |
-26:56:26.1 |
HIP 66550 |
14.97 |
| 2026-05-28 00:00 |
13:37:13.68 |
-26:53:39.4 |
HIP 66550 |
17.29 |
| 2026-05-28 12:00 |
13:37:02.92 |
-26:50:53.3 |
HIP 66346 |
17.17 |
| 2026-05-29 00:00 |
13:36:52.41 |
-26:48:07.8 |
HIP 66346 |
16.66 |
| 2026-05-29 12:00 |
13:36:42.13 |
-26:45:23.0 |
HIP 66398 |
15.56 |
| 2026-05-30 00:00 |
13:36:32.09 |
-26:42:38.7 |
HIP 66398 |
13.27 |
| 2026-05-30 12:00 |
13:36:22.28 |
-26:39:55.1 |
HIP 66398 |
11.61 |
| 2026-05-31 00:00 |
13:36:12.72 |
-26:37:12.2 |
HIP 66398 |
10.83 |
| 2026-05-31 12:00 |
13:36:03.39 |
-26:34:30.0 |
HIP 66398 |
11.07 |
| 2026-06-01 00:00 |
13:35:54.30 |
-26:31:48.6 |
HIP 66398 |
12.25 |
| 2026-06-01 12:00 |
13:35:45.45 |
-26:29:07.8 |
HIP 66398 |
14.10 |
| 2026-06-02 00:00 |
13:35:36.84 |
-26:26:27.8 |
HIP 66400 |
16.37 |