메타데이터
| 항목 |
값 |
| Designation |
P/2018 L4 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-07-31T20:14:06.267840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:44Z |
| Obs used |
129 |
| NEO |
- |
| M1 |
15.000 |
| K1 |
21.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2018-06-08T12:14:11.040000Z |
| Discovery magnitude (MPC) |
21.00 i |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2018-06-29.0000000 |
| e |
0.66033053 |
| q (au) |
1.676234 |
| a (au) |
4.934898 |
| i (deg) |
26.625477 |
| Ω (om, deg) |
145.193041 |
| ω (w, deg) |
140.432575 |
| M (ma, deg) |
357.047219 |
밝기
산란 + 전체 선형
$$
M_a = (17.644 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
17.644 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.692 |
| k |
0.800 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
09:19:45.99 |
+10:18:23.5 |
HIP 45691 |
27.92 |
| 2026-09-20 12:00 |
09:20:01.61 |
+10:17:23.7 |
HIP 45691 |
30.74 |
| 2026-09-21 00:00 |
09:20:17.18 |
+10:16:23.9 |
HIP 45740 |
31.18 |
| 2026-09-21 12:00 |
09:20:32.69 |
+10:15:24.3 |
HIP 45740 |
31.90 |
| 2026-09-22 00:00 |
09:20:48.15 |
+10:14:24.8 |
HIP 45740 |
33.08 |
| 2026-09-22 12:00 |
09:21:03.54 |
+10:13:25.3 |
HIP 45740 |
34.65 |
| 2026-09-23 00:00 |
09:21:18.88 |
+10:12:26.0 |
HIP 45740 |
36.57 |
| 2026-09-23 12:00 |
09:21:34.16 |
+10:11:26.9 |
HIP 45740 |
38.78 |
| 2026-09-24 00:00 |
09:21:49.37 |
+10:10:27.8 |
HIP 46106 |
41.04 |
| 2026-09-24 12:00 |
09:22:04.53 |
+10:09:28.8 |
HIP 46106 |
38.56 |
| 2026-09-25 00:00 |
09:22:19.62 |
+10:08:30.0 |
HIP 46106 |
36.32 |
| 2026-09-25 12:00 |
09:22:34.66 |
+10:07:31.4 |
HIP 46106 |
34.38 |
| 2026-09-26 00:00 |
09:22:49.63 |
+10:06:32.8 |
HIP 46106 |
32.78 |
| 2026-09-26 12:00 |
09:23:04.53 |
+10:05:34.4 |
HIP 46106 |
31.56 |
| 2026-09-27 00:00 |
09:23:19.38 |
+10:04:36.2 |
HIP 46106 |
30.77 |
| 2026-09-27 12:00 |
09:23:34.16 |
+10:03:38.1 |
HIP 46189 |
30.37 |
| 2026-09-28 00:00 |
09:23:48.87 |
+10:02:40.2 |
HIP 46189 |
28.65 |
| 2026-09-28 12:00 |
09:24:03.52 |
+10:01:42.4 |
HIP 46189 |
27.34 |
| 2026-09-29 00:00 |
09:24:18.10 |
+10:00:44.8 |
HIP 46189 |
26.50 |
| 2026-09-29 12:00 |
09:24:32.61 |
+09:59:47.4 |
HIP 46189 |
26.16 |
| 2026-09-30 00:00 |
09:24:47.06 |
+09:58:50.1 |
HIP 46189 |
26.34 |
| 2026-09-30 12:00 |
09:25:01.44 |
+09:57:53.1 |
HIP 46160 |
26.56 |
| 2026-10-01 00:00 |
09:25:15.74 |
+09:56:56.2 |
HIP 46160 |
26.27 |
| 2026-10-01 12:00 |
09:25:29.98 |
+09:55:59.5 |
HIP 46160 |
26.47 |
| 2026-10-02 00:00 |
09:25:44.15 |
+09:55:03.0 |
HIP 46160 |
27.17 |
| 2026-10-02 12:00 |
09:25:58.25 |
+09:54:06.7 |
HIP 46197 |
28.06 |
| 2026-10-03 00:00 |
09:26:12.27 |
+09:53:10.6 |
HIP 46197 |
28.91 |
| 2026-10-03 12:00 |
09:26:26.22 |
+09:52:14.7 |
HIP 46197 |
30.15 |
| 2026-10-04 00:00 |
09:26:40.10 |
+09:51:19.1 |
HIP 46431 |
30.53 |
| 2026-10-04 12:00 |
09:26:53.90 |
+09:50:23.6 |
HIP 46431 |
28.97 |
| 2026-10-05 00:00 |
09:27:07.63 |
+09:49:28.4 |
HIP 46431 |
27.77 |
| 2026-10-05 12:00 |
09:27:21.28 |
+09:48:33.5 |
HIP 46431 |
26.99 |
| 2026-10-06 00:00 |
09:27:34.86 |
+09:47:38.8 |
HIP 46431 |
26.64 |
| 2026-10-06 12:00 |
09:27:48.35 |
+09:46:44.3 |
HIP 46431 |
26.74 |
| 2026-10-07 00:00 |
09:28:01.77 |
+09:45:50.1 |
HIP 46568 |
26.83 |
| 2026-10-07 12:00 |
09:28:15.11 |
+09:44:56.1 |
HIP 46568 |
23.75 |
| 2026-10-08 00:00 |
09:28:28.37 |
+09:44:02.4 |
HIP 46568 |
20.79 |
| 2026-10-08 12:00 |
09:28:41.55 |
+09:43:09.0 |
HIP 46568 |
18.00 |
| 2026-10-09 00:00 |
09:28:54.65 |
+09:42:15.8 |
HIP 46568 |
15.46 |
| 2026-10-09 12:00 |
09:29:07.66 |
+09:41:23.0 |
HIP 46568 |
13.30 |
| 2026-10-10 00:00 |
09:29:20.59 |
+09:40:30.4 |
HIP 46568 |
11.69 |
| 2026-10-10 12:00 |
09:29:33.44 |
+09:39:38.1 |
HIP 46568 |
10.89 |
| 2026-10-11 00:00 |
09:29:46.20 |
+09:38:46.2 |
HIP 46568 |
11.04 |