메타데이터
| 항목 |
값 |
| Designation |
284P/McNaught |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-09-14T05:45:32.915520Z |
| Orbit solution date (soln_date, UTC) |
2024-02-21T14:09:44Z |
| Obs used |
1370 |
| NEO |
- |
| M1 |
9.300 |
| K1 |
17.000 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2018-07-22.0000000 |
| e |
0.37568432 |
| q (au) |
2.292800 |
| a (au) |
3.672500 |
| i (deg) |
11.859915 |
| Ω (om, deg) |
144.293116 |
| ω (w, deg) |
202.773845 |
| M (ma, deg) |
198.916990 |
밝기
산란 + 전체 선형
$$
M_a = (11.012 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
11.012 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.551 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2020-04-17 |
2021-09-14 |
+3.2889 |
-0.825 |
| 2021-09-14 |
2024-02-04 |
-0.6016 |
-0.069 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
12:45:08.56 |
+07:22:30.0 |
HIP 62267 |
19.25 |
| 2026-05-12 12:00 |
12:44:57.41 |
+07:23:07.8 |
HIP 62267 |
19.88 |
| 2026-05-13 00:00 |
12:44:46.43 |
+07:23:43.9 |
HIP 62112 |
17.51 |
| 2026-05-13 12:00 |
12:44:35.62 |
+07:24:18.4 |
HIP 62112 |
15.00 |
| 2026-05-14 00:00 |
12:44:24.99 |
+07:24:51.3 |
HIP 62112 |
12.64 |
| 2026-05-14 12:00 |
12:44:14.53 |
+07:25:22.5 |
HIP 62112 |
10.49 |
| 2026-05-15 00:00 |
12:44:04.25 |
+07:25:52.1 |
HIP 62112 |
8.66 |
| 2026-05-15 12:00 |
12:43:54.15 |
+07:26:20.0 |
HIP 62112 |
7.35 |
| 2026-05-16 00:00 |
12:43:44.23 |
+07:26:46.3 |
HIP 62112 |
6.80 |
| 2026-05-16 12:00 |
12:43:34.49 |
+07:27:11.0 |
HIP 62112 |
7.14 |
| 2026-05-17 00:00 |
12:43:24.94 |
+07:27:34.0 |
HIP 62112 |
8.22 |
| 2026-05-17 12:00 |
12:43:15.56 |
+07:27:55.4 |
HIP 62112 |
9.76 |
| 2026-05-18 00:00 |
12:43:06.38 |
+07:28:15.2 |
HIP 62112 |
11.54 |
| 2026-05-18 12:00 |
12:42:57.38 |
+07:28:33.4 |
HIP 62112 |
13.45 |
| 2026-05-19 00:00 |
12:42:48.57 |
+07:28:49.9 |
HIP 61955 |
15.31 |
| 2026-05-19 12:00 |
12:42:39.94 |
+07:29:04.8 |
HIP 61955 |
13.41 |
| 2026-05-20 00:00 |
12:42:31.51 |
+07:29:18.0 |
HIP 61955 |
11.61 |
| 2026-05-20 12:00 |
12:42:23.27 |
+07:29:29.7 |
HIP 61955 |
9.97 |
| 2026-05-21 00:00 |
12:42:15.22 |
+07:29:39.7 |
HIP 61955 |
8.52 |
| 2026-05-21 12:00 |
12:42:07.35 |
+07:29:48.2 |
HIP 61955 |
7.34 |
| 2026-05-22 00:00 |
12:41:59.69 |
+07:29:55.0 |
HIP 61955 |
6.53 |
| 2026-05-22 12:00 |
12:41:52.21 |
+07:30:00.3 |
HIP 61955 |
6.20 |
| 2026-05-23 00:00 |
12:41:44.93 |
+07:30:03.9 |
HIP 61955 |
6.37 |
| 2026-05-23 12:00 |
12:41:37.84 |
+07:30:06.0 |
HIP 61955 |
6.98 |
| 2026-05-24 00:00 |
12:41:30.95 |
+07:30:06.5 |
HIP 61955 |
7.89 |
| 2026-05-24 12:00 |
12:41:24.26 |
+07:30:05.4 |
HIP 61955 |
8.97 |
| 2026-05-25 00:00 |
12:41:17.76 |
+07:30:02.7 |
HIP 61955 |
10.16 |
| 2026-05-25 12:00 |
12:41:11.45 |
+07:29:58.5 |
HIP 61955 |
11.40 |
| 2026-05-26 00:00 |
12:41:05.34 |
+07:29:52.8 |
HIP 61955 |
12.66 |
| 2026-05-26 12:00 |
12:40:59.43 |
+07:29:45.4 |
HIP 61852 |
13.63 |
| 2026-05-27 00:00 |
12:40:53.72 |
+07:29:36.6 |
HIP 61852 |
13.21 |
| 2026-05-27 12:00 |
12:40:48.20 |
+07:29:26.2 |
HIP 61852 |
12.96 |
| 2026-05-28 00:00 |
12:40:42.88 |
+07:29:14.3 |
HIP 61852 |
12.89 |
| 2026-05-28 12:00 |
12:40:37.76 |
+07:29:00.8 |
HIP 61852 |
12.99 |
| 2026-05-29 00:00 |
12:40:32.84 |
+07:28:45.9 |
HIP 61852 |
13.24 |
| 2026-05-29 12:00 |
12:40:28.12 |
+07:28:29.4 |
HIP 61852 |
13.61 |
| 2026-05-30 00:00 |
12:40:23.59 |
+07:28:11.4 |
HIP 61852 |
14.09 |
| 2026-05-30 12:00 |
12:40:19.27 |
+07:27:51.9 |
HIP 61852 |
14.66 |
| 2026-05-31 00:00 |
12:40:15.14 |
+07:27:31.0 |
HIP 61754 |
14.73 |
| 2026-05-31 12:00 |
12:40:11.21 |
+07:27:08.5 |
HIP 61754 |
14.07 |
| 2026-06-01 00:00 |
12:40:07.48 |
+07:26:44.6 |
HIP 61754 |
13.51 |
| 2026-06-01 12:00 |
12:40:03.95 |
+07:26:19.2 |
HIP 61754 |
13.06 |
| 2026-06-02 00:00 |
12:40:00.62 |
+07:25:52.4 |
HIP 61754 |
12.72 |