498P/LINEAR
| 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) |
| 2026-02-03 00:00 |
14:24:24.56 |
-29:24:58.2 |
HIP 70375 |
16.82 |
| 2026-02-03 12:00 |
14:24:34.93 |
-29:27:19.6 |
HIP 70375 |
15.76 |
| 2026-02-04 00:00 |
14:24:45.03 |
-29:29:39.9 |
HIP 70375 |
15.30 |
| 2026-02-04 12:00 |
14:24:54.87 |
-29:31:59.2 |
HIP 70375 |
15.46 |
| 2026-02-05 00:00 |
14:25:04.43 |
-29:34:17.3 |
HIP 70375 |
16.20 |
| 2026-02-05 12:00 |
14:25:13.72 |
-29:36:34.3 |
HIP 70375 |
17.41 |
| 2026-02-06 00:00 |
14:25:22.74 |
-29:38:50.3 |
HIP 70375 |
18.98 |
| 2026-02-06 12:00 |
14:25:31.48 |
-29:41:05.1 |
HIP 70375 |
20.81 |
| 2026-02-07 00:00 |
14:25:39.95 |
-29:43:18.7 |
HIP 70375 |
22.80 |
| 2026-02-07 12:00 |
14:25:48.14 |
-29:45:31.2 |
HIP 70375 |
24.90 |
| 2026-02-08 00:00 |
14:25:56.05 |
-29:47:42.6 |
HIP 70375 |
27.08 |
| 2026-02-08 12:00 |
14:26:03.69 |
-29:49:52.8 |
HIP 70561 |
27.30 |
| 2026-02-09 00:00 |
14:26:11.04 |
-29:52:01.9 |
HIP 70561 |
25.24 |
| 2026-02-09 12:00 |
14:26:18.12 |
-29:54:09.7 |
HIP 70561 |
23.33 |
| 2026-02-10 00:00 |
14:26:24.91 |
-29:56:16.4 |
HIP 70561 |
21.57 |
| 2026-02-10 12:00 |
14:26:31.42 |
-29:58:21.8 |
HIP 70561 |
19.98 |
| 2026-02-11 00:00 |
14:26:37.64 |
-30:00:26.1 |
HIP 70561 |
18.59 |
| 2026-02-11 12:00 |
14:26:43.58 |
-30:02:29.1 |
HIP 70561 |
17.42 |
| 2026-02-12 00:00 |
14:26:49.23 |
-30:04:30.9 |
HIP 70561 |
16.50 |
| 2026-02-12 12:00 |
14:26:54.60 |
-30:06:31.4 |
HIP 70561 |
15.86 |
| 2026-02-13 00:00 |
14:26:59.67 |
-30:08:30.7 |
HIP 70561 |
15.49 |
| 2026-02-13 12:00 |
14:27:04.46 |
-30:10:28.6 |
HIP 70561 |
15.41 |
| 2026-02-14 00:00 |
14:27:08.95 |
-30:12:25.3 |
HIP 70561 |
15.59 |
| 2026-02-14 12:00 |
14:27:13.15 |
-30:14:20.8 |
HIP 70561 |
16.01 |
| 2026-02-15 00:00 |
14:27:17.06 |
-30:16:14.9 |
HIP 70561 |
16.62 |
| 2026-02-15 12:00 |
14:27:20.68 |
-30:18:07.6 |
HIP 70561 |
17.40 |
| 2026-02-16 00:00 |
14:27:24.01 |
-30:19:59.1 |
HIP 70561 |
18.31 |
| 2026-02-16 12:00 |
14:27:27.04 |
-30:21:49.2 |
HIP 70561 |
19.31 |
| 2026-02-17 00:00 |
14:27:29.77 |
-30:23:38.0 |
HIP 70561 |
20.38 |
| 2026-02-17 12:00 |
14:27:32.21 |
-30:25:25.4 |
HIP 70561 |
21.50 |
| 2026-02-18 00:00 |
14:27:34.36 |
-30:27:11.4 |
HIP 70561 |
22.65 |
| 2026-02-18 12:00 |
14:27:36.20 |
-30:28:56.0 |
HIP 70561 |
23.82 |
| 2026-02-19 00:00 |
14:27:37.75 |
-30:30:39.2 |
HIP 70561 |
24.99 |
| 2026-02-19 12:00 |
14:27:39.01 |
-30:32:21.0 |
HIP 70561 |
26.16 |
| 2026-02-20 00:00 |
14:27:39.96 |
-30:34:01.4 |
HIP 70561 |
27.33 |
| 2026-02-20 12:00 |
14:27:40.62 |
-30:35:40.3 |
HIP 70561 |
28.48 |
| 2026-02-21 00:00 |
14:27:40.98 |
-30:37:17.8 |
HIP 70561 |
29.62 |
| 2026-02-21 12:00 |
14:27:41.04 |
-30:38:53.8 |
HIP 70525 |
29.94 |
| 2026-02-22 00:00 |
14:27:40.80 |
-30:40:28.3 |
HIP 70525 |
29.24 |
| 2026-02-22 12:00 |
14:27:40.27 |
-30:42:01.4 |
HIP 70525 |
28.56 |
| 2026-02-23 00:00 |
14:27:39.44 |
-30:43:33.0 |
HIP 70525 |
27.90 |
| 2026-02-23 12:00 |
14:27:38.30 |
-30:45:03.0 |
HIP 70525 |
27.25 |
| 2026-02-24 00:00 |
14:27:36.88 |
-30:46:31.6 |
HIP 70525 |
26.62 |