C/2018 N2 (ASASSN)
메타데이터
| 항목 | 값 |
|---|---|
| Designation | C/2018 N2 (ASASSN) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2019-11-10T23:08:28.780800Z |
| Orbit solution date (soln_date, UTC) | 2022-12-31T16:12:33Z |
| Obs used | 4653 |
| NEO | - |
| M1 | 9.600 |
| K1 | 4.500 |
| PC | - |
| Discovery observation (MPC, UTC) | 2018-07-07T09:19:02.208000Z |
| Discovery magnitude (MPC) | 16.40 V |
| Discovery observatory (MPC) | W87 · Cerro Tololo-LCO C |
Osculating 궤도요소
| 항목 | 값 |
|---|---|
| Epoch (epoch_cal, TDB) | 2020-02-26.0000000 |
| e | 1.00018357 |
| q (au) | 3.124659 |
| a (au) | -17021.931787 |
| i (deg) | 77.530043 |
| Ω (om, deg) | 25.257801 |
| ω (w, deg) | 24.397034 |
| M (ma, deg) | 0.000048 |
밝기
산란 + 전체 선형
$$ M_a = (8.257 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
모델 상수
| 항목 | 값 |
|---|---|
| H0 | 8.257 |
| n | 2.000 |
| gf | 1.000 |
| gb | -0.503 |
| k | 1.000 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) | 끝 (UTC) | a | b |
|---|---|---|---|
| 2017-10-27 | 2019-11-10 | -2.4742 | +1.036 |
| 2019-11-11 | 2021-04-20 | +0.5916 | -0.832 |
| 2021-04-20 | 2022-05-28 | +2.9514 | -2.352 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
찾아보기
천체력
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-06-01 00:00 | 13:40:53.56 | +18:01:45.5 | HIP 66792 | 7.20 |
| 2026-06-01 12:00 | 13:40:48.42 | +18:01:19.3 | HIP 66792 | 8.31 |
| 2026-06-02 00:00 | 13:40:43.32 | +18:00:52.6 | HIP 66792 | 9.44 |
| 2026-06-02 12:00 | 13:40:38.27 | +18:00:25.4 | HIP 66792 | 10.61 |
| 2026-06-03 00:00 | 13:40:33.26 | +17:59:57.7 | HIP 66792 | 11.79 |
| 2026-06-03 12:00 | 13:40:28.30 | +17:59:29.6 | HIP 66745 | 12.37 |
| 2026-06-04 00:00 | 13:40:23.39 | +17:59:00.9 | HIP 66745 | 12.43 |
| 2026-06-04 12:00 | 13:40:18.53 | +17:58:31.9 | HIP 66745 | 12.61 |
| 2026-06-05 00:00 | 13:40:13.71 | +17:58:02.3 | HIP 66745 | 12.90 |
| 2026-06-05 12:00 | 13:40:08.94 | +17:57:32.3 | HIP 66745 | 13.28 |
| 2026-06-06 00:00 | 13:40:04.22 | +17:57:01.8 | HIP 66745 | 13.75 |
| 2026-06-06 12:00 | 13:39:59.55 | +17:56:30.8 | HIP 66745 | 14.30 |
| 2026-06-07 00:00 | 13:39:54.93 | +17:55:59.4 | HIP 66745 | 14.92 |
| 2026-06-07 12:00 | 13:39:50.36 | +17:55:27.5 | HIP 66745 | 15.59 |
| 2026-06-08 00:00 | 13:39:45.83 | +17:54:55.1 | HIP 66745 | 16.31 |
| 2026-06-08 12:00 | 13:39:41.36 | +17:54:22.3 | HIP 66745 | 17.07 |
| 2026-06-09 00:00 | 13:39:36.93 | +17:53:49.1 | HIP 66745 | 17.87 |
| 2026-06-09 12:00 | 13:39:32.56 | +17:53:15.4 | HIP 66628 | 17.62 |
| 2026-06-10 00:00 | 13:39:28.24 | +17:52:41.2 | HIP 66628 | 16.98 |
| 2026-06-10 12:00 | 13:39:23.96 | +17:52:06.6 | HIP 66628 | 16.40 |
| 2026-06-11 00:00 | 13:39:19.74 | +17:51:31.6 | HIP 66628 | 15.87 |
| 2026-06-11 12:00 | 13:39:15.57 | +17:50:56.1 | HIP 66628 | 15.40 |
| 2026-06-12 00:00 | 13:39:11.45 | +17:50:20.1 | HIP 66628 | 15.00 |
| 2026-06-12 12:00 | 13:39:07.38 | +17:49:43.7 | HIP 66628 | 14.66 |
| 2026-06-13 00:00 | 13:39:03.36 | +17:49:06.9 | HIP 66628 | 14.40 |
| 2026-06-13 12:00 | 13:38:59.40 | +17:48:29.7 | HIP 66628 | 14.21 |
| 2026-06-14 00:00 | 13:38:55.49 | +17:47:52.0 | HIP 66628 | 14.09 |
| 2026-06-14 12:00 | 13:38:51.63 | +17:47:13.9 | HIP 66628 | 14.05 |
| 2026-06-15 00:00 | 13:38:47.83 | +17:46:35.3 | HIP 66628 | 14.09 |
| 2026-06-15 12:00 | 13:38:44.07 | +17:45:56.3 | HIP 66628 | 14.20 |
| 2026-06-16 00:00 | 13:38:40.37 | +17:45:17.0 | HIP 66628 | 14.38 |
| 2026-06-16 12:00 | 13:38:36.73 | +17:44:37.2 | HIP 66628 | 14.63 |
| 2026-06-17 00:00 | 13:38:33.14 | +17:43:56.9 | HIP 66628 | 14.94 |
| 2026-06-17 12:00 | 13:38:29.60 | +17:43:16.3 | HIP 66628 | 15.30 |
| 2026-06-18 00:00 | 13:38:26.12 | +17:42:35.3 | HIP 66628 | 15.72 |
| 2026-06-18 12:00 | 13:38:22.69 | +17:41:53.8 | HIP 66628 | 16.18 |
| 2026-06-19 00:00 | 13:38:19.31 | +17:41:12.0 | HIP 66628 | 16.69 |
| 2026-06-19 12:00 | 13:38:15.99 | +17:40:29.7 | HIP 66628 | 17.23 |
| 2026-06-20 00:00 | 13:38:12.73 | +17:39:47.1 | HIP 66628 | 17.80 |
| 2026-06-20 12:00 | 13:38:09.51 | +17:39:04.1 | HIP 66628 | 18.40 |
| 2026-06-21 00:00 | 13:38:06.36 | +17:38:20.7 | HIP 66628 | 19.03 |
| 2026-06-21 12:00 | 13:38:03.26 | +17:37:36.9 | HIP 66628 | 19.68 |
| 2026-06-22 00:00 | 13:38:00.21 | +17:36:52.7 | HIP 66628 | 20.35 |