메타데이터
| 항목 |
값 |
| Designation |
C/2018 X2 (Fitzsimmons) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-07-08T12:50:12.180480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:48Z |
| Obs used |
390 |
| NEO |
- |
| M1 |
10.600 |
| K1 |
12.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2018-12-08T11:10:09.696000Z |
| Discovery magnitude (MPC) |
19.10 c |
| Discovery observatory (MPC) |
T05 · ATLAS-HKO, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2019-02-10.0000000 |
| e |
0.98628022 |
| q (au) |
2.125879 |
| a (au) |
154.949983 |
| i (deg) |
23.068234 |
| Ω (om, deg) |
340.833210 |
| ω (w, deg) |
162.047045 |
| M (ma, deg) |
359.924099 |
밝기
산란 + 전체 선형
$$
M_a = (10.225 + 5.892\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.225 |
| n |
5.892 |
| gf |
0.996 |
| gb |
-0.500 |
| k |
0.800 |
| δ90 |
2.692 |
| 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 |
19:10:31.93 |
-41:54:01.2 |
HIP 94157 |
6.40 |
| 2026-09-20 12:00 |
19:10:30.25 |
-41:53:30.5 |
HIP 94157 |
6.07 |
| 2026-09-21 00:00 |
19:10:28.65 |
-41:52:59.6 |
HIP 94157 |
5.79 |
| 2026-09-21 12:00 |
19:10:27.12 |
-41:52:28.6 |
HIP 94157 |
5.59 |
| 2026-09-22 00:00 |
19:10:25.67 |
-41:51:57.5 |
HIP 94157 |
5.45 |
| 2026-09-22 12:00 |
19:10:24.28 |
-41:51:26.2 |
HIP 94157 |
5.38 |
| 2026-09-23 00:00 |
19:10:22.96 |
-41:50:54.8 |
HIP 94157 |
5.39 |
| 2026-09-23 12:00 |
19:10:21.72 |
-41:50:23.3 |
HIP 94157 |
5.47 |
| 2026-09-24 00:00 |
19:10:20.55 |
-41:49:51.6 |
HIP 94157 |
5.63 |
| 2026-09-24 12:00 |
19:10:19.45 |
-41:49:19.9 |
HIP 94157 |
5.84 |
| 2026-09-25 00:00 |
19:10:18.41 |
-41:48:48.0 |
HIP 94157 |
6.11 |
| 2026-09-25 12:00 |
19:10:17.46 |
-41:48:15.9 |
HIP 94157 |
6.43 |
| 2026-09-26 00:00 |
19:10:16.57 |
-41:47:43.8 |
HIP 94157 |
6.79 |
| 2026-09-26 12:00 |
19:10:15.75 |
-41:47:11.5 |
HIP 94157 |
7.18 |
| 2026-09-27 00:00 |
19:10:15.01 |
-41:46:39.1 |
HIP 94157 |
7.60 |
| 2026-09-27 12:00 |
19:10:14.33 |
-41:46:06.6 |
HIP 94157 |
8.05 |
| 2026-09-28 00:00 |
19:10:13.73 |
-41:45:34.0 |
HIP 94157 |
8.51 |
| 2026-09-28 12:00 |
19:10:13.20 |
-41:45:01.3 |
HIP 94157 |
8.99 |
| 2026-09-29 00:00 |
19:10:12.74 |
-41:44:28.5 |
HIP 94157 |
9.48 |
| 2026-09-29 12:00 |
19:10:12.35 |
-41:43:55.6 |
HIP 94157 |
9.99 |
| 2026-09-30 00:00 |
19:10:12.03 |
-41:43:22.6 |
HIP 94157 |
10.50 |
| 2026-09-30 12:00 |
19:10:11.79 |
-41:42:49.5 |
HIP 94157 |
11.03 |
| 2026-10-01 00:00 |
19:10:11.61 |
-41:42:16.3 |
HIP 94157 |
11.56 |
| 2026-10-01 12:00 |
19:10:11.51 |
-41:41:42.9 |
HIP 94157 |
12.10 |
| 2026-10-02 00:00 |
19:10:11.48 |
-41:41:09.5 |
HIP 94157 |
12.64 |
| 2026-10-02 12:00 |
19:10:11.52 |
-41:40:36.1 |
HIP 94157 |
13.19 |
| 2026-10-03 00:00 |
19:10:11.63 |
-41:40:02.5 |
HIP 94157 |
13.74 |
| 2026-10-03 12:00 |
19:10:11.81 |
-41:39:28.8 |
HIP 94157 |
14.30 |
| 2026-10-04 00:00 |
19:10:12.06 |
-41:38:55.1 |
HIP 94157 |
14.86 |
| 2026-10-04 12:00 |
19:10:12.39 |
-41:38:21.2 |
HIP 94157 |
15.43 |
| 2026-10-05 00:00 |
19:10:12.78 |
-41:37:47.3 |
HIP 94157 |
16.00 |
| 2026-10-05 12:00 |
19:10:13.25 |
-41:37:13.3 |
HIP 94157 |
16.57 |
| 2026-10-06 00:00 |
19:10:13.79 |
-41:36:39.3 |
HIP 94157 |
17.15 |
| 2026-10-06 12:00 |
19:10:14.40 |
-41:36:05.1 |
HIP 94157 |
17.73 |
| 2026-10-07 00:00 |
19:10:15.08 |
-41:35:30.9 |
HIP 94157 |
18.31 |
| 2026-10-07 12:00 |
19:10:15.83 |
-41:34:56.7 |
HIP 94157 |
18.90 |
| 2026-10-08 00:00 |
19:10:16.65 |
-41:34:22.3 |
HIP 94157 |
19.49 |
| 2026-10-08 12:00 |
19:10:17.54 |
-41:33:47.9 |
HIP 94157 |
20.08 |
| 2026-10-09 00:00 |
19:10:18.51 |
-41:33:13.4 |
HIP 94116 |
19.91 |
| 2026-10-09 12:00 |
19:10:19.54 |
-41:32:38.9 |
HIP 94116 |
19.48 |
| 2026-10-10 00:00 |
19:10:20.65 |
-41:32:04.3 |
HIP 94116 |
19.06 |
| 2026-10-10 12:00 |
19:10:21.83 |
-41:31:29.7 |
HIP 94116 |
18.66 |
| 2026-10-11 00:00 |
19:10:23.07 |
-41:30:55.0 |
HIP 94116 |
18.28 |