메타데이터
| 항목 |
값 |
| Designation |
C/2018 N1 (NEOWISE) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-08-01T23:35:12.114240Z |
| Orbit solution date (soln_date, UTC) |
2022-06-20T23:12:32Z |
| Obs used |
263 |
| NEO |
- |
| M1 |
14.800 |
| K1 |
11.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2018-07-02T08:53:36.384000Z |
| Discovery magnitude (MPC) |
16.00 R |
| Discovery observatory (MPC) |
C51 · WISE |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2018-07-23.0000000 |
| e |
0.99690168 |
| q (au) |
1.307382 |
| a (au) |
421.964782 |
| i (deg) |
159.444331 |
| Ω (om, deg) |
292.438182 |
| ω (w, deg) |
354.558421 |
| M (ma, deg) |
359.998865 |
밝기
산란 + 전체 선형
$$
M_a = (13.856 + 5.455\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
13.856 |
| n |
5.455 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.957 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2017-12-15 |
2018-08-01 |
+5.8573 |
-2.511 |
| 2018-08-02 |
2018-10-06 |
-17.1024 |
-0.661 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
09:53:51.66 |
+24:40:46.7 |
HIP 48642 |
17.06 |
| 2026-06-01 12:00 |
09:53:52.61 |
+24:40:23.5 |
HIP 48642 |
16.80 |
| 2026-06-02 00:00 |
09:53:53.62 |
+24:40:00.2 |
HIP 48642 |
16.53 |
| 2026-06-02 12:00 |
09:53:54.66 |
+24:39:36.7 |
HIP 48642 |
16.25 |
| 2026-06-03 00:00 |
09:53:55.76 |
+24:39:13.1 |
HIP 48642 |
15.98 |
| 2026-06-03 12:00 |
09:53:56.90 |
+24:38:49.3 |
HIP 48642 |
15.70 |
| 2026-06-04 00:00 |
09:53:58.08 |
+24:38:25.3 |
HIP 48642 |
15.42 |
| 2026-06-04 12:00 |
09:53:59.31 |
+24:38:01.2 |
HIP 48642 |
15.14 |
| 2026-06-05 00:00 |
09:54:00.58 |
+24:37:37.0 |
HIP 48642 |
14.87 |
| 2026-06-05 12:00 |
09:54:01.90 |
+24:37:12.5 |
HIP 48642 |
14.59 |
| 2026-06-06 00:00 |
09:54:03.26 |
+24:36:48.0 |
HIP 48642 |
14.32 |
| 2026-06-06 12:00 |
09:54:04.66 |
+24:36:23.2 |
HIP 48642 |
14.05 |
| 2026-06-07 00:00 |
09:54:06.11 |
+24:35:58.3 |
HIP 48642 |
13.79 |
| 2026-06-07 12:00 |
09:54:07.61 |
+24:35:33.3 |
HIP 48642 |
13.53 |
| 2026-06-08 00:00 |
09:54:09.14 |
+24:35:08.1 |
HIP 48642 |
13.28 |
| 2026-06-08 12:00 |
09:54:10.72 |
+24:34:42.8 |
HIP 48642 |
13.04 |
| 2026-06-09 00:00 |
09:54:12.35 |
+24:34:17.4 |
HIP 48642 |
12.81 |
| 2026-06-09 12:00 |
09:54:14.01 |
+24:33:51.8 |
HIP 48642 |
12.59 |
| 2026-06-10 00:00 |
09:54:15.72 |
+24:33:26.0 |
HIP 48642 |
12.39 |
| 2026-06-10 12:00 |
09:54:17.47 |
+24:33:00.2 |
HIP 48642 |
12.20 |
| 2026-06-11 00:00 |
09:54:19.27 |
+24:32:34.1 |
HIP 48642 |
12.03 |
| 2026-06-11 12:00 |
09:54:21.10 |
+24:32:08.0 |
HIP 48642 |
11.89 |
| 2026-06-12 00:00 |
09:54:22.98 |
+24:31:41.7 |
HIP 48642 |
11.76 |
| 2026-06-12 12:00 |
09:54:24.90 |
+24:31:15.3 |
HIP 48642 |
11.66 |
| 2026-06-13 00:00 |
09:54:26.86 |
+24:30:48.8 |
HIP 48642 |
11.59 |
| 2026-06-13 12:00 |
09:54:28.87 |
+24:30:22.1 |
HIP 48642 |
11.54 |
| 2026-06-14 00:00 |
09:54:30.91 |
+24:29:55.3 |
HIP 48642 |
11.52 |
| 2026-06-14 12:00 |
09:54:33.00 |
+24:29:28.4 |
HIP 48642 |
11.54 |
| 2026-06-15 00:00 |
09:54:35.12 |
+24:29:01.4 |
HIP 48642 |
11.59 |
| 2026-06-15 12:00 |
09:54:37.29 |
+24:28:34.2 |
HIP 48642 |
11.67 |
| 2026-06-16 00:00 |
09:54:39.50 |
+24:28:06.9 |
HIP 48642 |
11.78 |
| 2026-06-16 12:00 |
09:54:41.74 |
+24:27:39.6 |
HIP 48642 |
11.93 |
| 2026-06-17 00:00 |
09:54:44.03 |
+24:27:12.1 |
HIP 48642 |
12.12 |
| 2026-06-17 12:00 |
09:54:46.35 |
+24:26:44.5 |
HIP 48642 |
12.34 |
| 2026-06-18 00:00 |
09:54:48.72 |
+24:26:16.7 |
HIP 48642 |
12.59 |
| 2026-06-18 12:00 |
09:54:51.12 |
+24:25:48.9 |
HIP 48642 |
12.88 |
| 2026-06-19 00:00 |
09:54:53.56 |
+24:25:21.0 |
HIP 48642 |
13.20 |
| 2026-06-19 12:00 |
09:54:56.04 |
+24:24:53.0 |
HIP 48642 |
13.55 |
| 2026-06-20 00:00 |
09:54:58.56 |
+24:24:24.8 |
HIP 48642 |
13.94 |
| 2026-06-20 12:00 |
09:55:01.12 |
+24:23:56.6 |
HIP 48642 |
14.35 |
| 2026-06-21 00:00 |
09:55:03.71 |
+24:23:28.3 |
HIP 48642 |
14.79 |
| 2026-06-21 12:00 |
09:55:06.34 |
+24:22:59.9 |
HIP 48642 |
15.25 |
| 2026-06-22 00:00 |
09:55:09.01 |
+24:22:31.4 |
HIP 48642 |
15.74 |