메타데이터
| 항목 |
값 |
| Designation |
C/2018 X3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-12-30T19:11:56.958720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:48Z |
| Obs used |
50 |
| NEO |
- |
| M1 |
16.900 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2018-12-12T11:04:53.472000Z |
| Discovery magnitude (MPC) |
20.50 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2018-12-10.0000000 |
| e |
0.78271953 |
| q (au) |
2.698917 |
| a (au) |
12.421353 |
| i (deg) |
43.369641 |
| Ω (om, deg) |
78.924758 |
| ω (w, deg) |
359.834482 |
| M (ma, deg) |
359.531712 |
밝기
산란 + 전체 선형
$$
M_a = (16.711 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
16.711 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.943 |
| δ90 |
1.000 |
| 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 |
15:42:10.13 |
-00:07:29.1 |
HIP 76913 |
17.98 |
| 2026-09-20 12:00 |
15:42:14.54 |
-00:08:26.6 |
HIP 76913 |
16.94 |
| 2026-09-21 00:00 |
15:42:19.00 |
-00:09:24.0 |
HIP 76913 |
15.97 |
| 2026-09-21 12:00 |
15:42:23.50 |
-00:10:21.5 |
HIP 76913 |
15.08 |
| 2026-09-22 00:00 |
15:42:28.06 |
-00:11:18.9 |
HIP 76913 |
14.29 |
| 2026-09-22 12:00 |
15:42:32.66 |
-00:12:16.2 |
HIP 76913 |
13.62 |
| 2026-09-23 00:00 |
15:42:37.32 |
-00:13:13.5 |
HIP 76913 |
13.09 |
| 2026-09-23 12:00 |
15:42:42.02 |
-00:14:10.7 |
HIP 76913 |
12.73 |
| 2026-09-24 00:00 |
15:42:46.77 |
-00:15:07.9 |
HIP 76913 |
12.54 |
| 2026-09-24 12:00 |
15:42:51.56 |
-00:16:05.0 |
HIP 76913 |
12.55 |
| 2026-09-25 00:00 |
15:42:56.41 |
-00:17:02.0 |
HIP 76913 |
12.76 |
| 2026-09-25 12:00 |
15:43:01.30 |
-00:17:59.0 |
HIP 76913 |
13.15 |
| 2026-09-26 00:00 |
15:43:06.24 |
-00:18:55.9 |
HIP 76913 |
13.72 |
| 2026-09-26 12:00 |
15:43:11.22 |
-00:19:52.7 |
HIP 76913 |
14.45 |
| 2026-09-27 00:00 |
15:43:16.25 |
-00:20:49.5 |
HIP 76913 |
15.31 |
| 2026-09-27 12:00 |
15:43:21.33 |
-00:21:46.2 |
HIP 76913 |
16.29 |
| 2026-09-28 00:00 |
15:43:26.45 |
-00:22:42.8 |
HIP 76913 |
17.37 |
| 2026-09-28 12:00 |
15:43:31.61 |
-00:23:39.4 |
HIP 76913 |
18.54 |
| 2026-09-29 00:00 |
15:43:36.82 |
-00:24:35.8 |
HIP 76913 |
19.78 |
| 2026-09-29 12:00 |
15:43:42.08 |
-00:25:32.2 |
HIP 76913 |
21.08 |
| 2026-09-30 00:00 |
15:43:47.38 |
-00:26:28.5 |
HIP 76913 |
22.43 |
| 2026-09-30 12:00 |
15:43:52.72 |
-00:27:24.7 |
HIP 76913 |
23.83 |
| 2026-10-01 00:00 |
15:43:58.11 |
-00:28:20.8 |
HIP 76913 |
25.26 |
| 2026-10-01 12:00 |
15:44:03.54 |
-00:29:16.9 |
HIP 76913 |
26.73 |
| 2026-10-02 00:00 |
15:44:09.02 |
-00:30:12.8 |
HIP 76913 |
28.23 |
| 2026-10-02 12:00 |
15:44:14.54 |
-00:31:08.6 |
HIP 76913 |
29.76 |
| 2026-10-03 00:00 |
15:44:20.10 |
-00:32:04.3 |
HIP 76913 |
31.31 |
| 2026-10-03 12:00 |
15:44:25.70 |
-00:33:00.0 |
HIP 76913 |
32.88 |
| 2026-10-04 00:00 |
15:44:31.34 |
-00:33:55.5 |
HIP 76913 |
34.47 |
| 2026-10-04 12:00 |
15:44:37.03 |
-00:34:50.9 |
HIP 76913 |
36.08 |
| 2026-10-05 00:00 |
15:44:42.76 |
-00:35:46.1 |
HIP 76913 |
37.71 |
| 2026-10-05 12:00 |
15:44:48.52 |
-00:36:41.3 |
HIP 76913 |
39.35 |
| 2026-10-06 00:00 |
15:44:54.33 |
-00:37:36.4 |
HIP 76913 |
41.01 |
| 2026-10-06 12:00 |
15:45:00.18 |
-00:38:31.3 |
HIP 77335 |
40.90 |
| 2026-10-07 00:00 |
15:45:06.07 |
-00:39:26.1 |
HIP 77335 |
40.19 |
| 2026-10-07 12:00 |
15:45:12.00 |
-00:40:20.8 |
HIP 77335 |
39.54 |
| 2026-10-08 00:00 |
15:45:17.97 |
-00:41:15.4 |
HIP 77348 |
38.78 |
| 2026-10-08 12:00 |
15:45:23.98 |
-00:42:09.8 |
HIP 77348 |
37.03 |
| 2026-10-09 00:00 |
15:45:30.02 |
-00:43:04.1 |
HIP 77348 |
35.28 |
| 2026-10-09 12:00 |
15:45:36.10 |
-00:43:58.3 |
HIP 77348 |
33.52 |
| 2026-10-10 00:00 |
15:45:42.23 |
-00:44:52.3 |
HIP 77348 |
31.75 |
| 2026-10-10 12:00 |
15:45:48.38 |
-00:45:46.2 |
HIP 77348 |
29.98 |
| 2026-10-11 00:00 |
15:45:54.58 |
-00:46:39.9 |
HIP 77348 |
28.20 |