메타데이터
| 항목 |
값 |
| Designation |
287P/Christensen |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2023-07-05T04:20:07.710720Z |
| Orbit solution date (soln_date, UTC) |
2025-10-30T09:37:11Z |
| Obs used |
270 |
| NEO |
- |
| M1 |
9.600 |
| K1 |
15.250 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2020-12-28.0000000 |
| e |
0.27096868 |
| q (au) |
3.038241 |
| a (au) |
4.167503 |
| i (deg) |
16.320345 |
| Ω (om, deg) |
139.045236 |
| ω (w, deg) |
188.874131 |
| M (ma, deg) |
253.514373 |
밝기
산란 + 전체 선형
$$
M_a = (10.191 + 5.080\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.191 |
| n |
5.080 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
| 2022-05-13 |
2023-07-04 |
+6.3005 |
-3.721 |
| 2023-07-12 |
2024-12-26 |
+1.9974 |
-0.830 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
06:26:18.92 |
+14:41:37.7 |
HIP 30564 |
12.39 |
| 2026-03-26 12:00 |
06:26:28.72 |
+14:43:00.0 |
HIP 30564 |
14.64 |
| 2026-03-27 00:00 |
06:26:38.71 |
+14:44:21.9 |
HIP 30722 |
12.69 |
| 2026-03-27 12:00 |
06:26:48.89 |
+14:45:43.4 |
HIP 30722 |
10.02 |
| 2026-03-28 00:00 |
06:26:59.25 |
+14:47:04.3 |
HIP 30722 |
7.44 |
| 2026-03-28 12:00 |
06:27:09.79 |
+14:48:24.8 |
HIP 30722 |
5.15 |
| 2026-03-29 00:00 |
06:27:20.52 |
+14:49:44.8 |
HIP 30722 |
3.78 |
| 2026-03-29 12:00 |
06:27:31.43 |
+14:51:04.3 |
HIP 30722 |
4.42 |
| 2026-03-30 00:00 |
06:27:42.52 |
+14:52:23.4 |
HIP 30722 |
6.53 |
| 2026-03-30 12:00 |
06:27:53.78 |
+14:53:41.9 |
HIP 30722 |
9.19 |
| 2026-03-31 00:00 |
06:28:05.22 |
+14:55:00.0 |
HIP 30722 |
12.06 |
| 2026-03-31 12:00 |
06:28:16.84 |
+14:56:17.5 |
HIP 30722 |
15.04 |
| 2026-04-01 00:00 |
06:28:28.64 |
+14:57:34.6 |
HIP 30722 |
18.10 |
| 2026-04-01 12:00 |
06:28:40.61 |
+14:58:51.2 |
HIP 30722 |
21.22 |
| 2026-04-02 00:00 |
06:28:52.75 |
+15:00:07.3 |
HIP 30998 |
22.31 |
| 2026-04-02 12:00 |
06:29:05.06 |
+15:01:22.9 |
HIP 30998 |
19.94 |
| 2026-04-03 00:00 |
06:29:17.55 |
+15:02:38.0 |
HIP 30998 |
17.79 |
| 2026-04-03 12:00 |
06:29:30.20 |
+15:03:52.6 |
HIP 30998 |
15.99 |
| 2026-04-04 00:00 |
06:29:43.03 |
+15:05:06.6 |
HIP 30998 |
14.69 |
| 2026-04-04 12:00 |
06:29:56.02 |
+15:06:20.2 |
HIP 30998 |
14.05 |
| 2026-04-05 00:00 |
06:30:09.18 |
+15:07:33.3 |
HIP 30998 |
14.19 |
| 2026-04-05 12:00 |
06:30:22.50 |
+15:08:45.8 |
HIP 30998 |
15.10 |
| 2026-04-06 00:00 |
06:30:35.99 |
+15:09:57.8 |
HIP 30998 |
16.69 |
| 2026-04-06 12:00 |
06:30:49.65 |
+15:11:09.3 |
HIP 31098 |
17.66 |
| 2026-04-07 00:00 |
06:31:03.47 |
+15:12:20.3 |
HIP 31098 |
14.85 |
| 2026-04-07 12:00 |
06:31:17.45 |
+15:13:30.8 |
HIP 31098 |
12.42 |
| 2026-04-08 00:00 |
06:31:31.59 |
+15:14:40.7 |
HIP 31098 |
10.66 |
| 2026-04-08 12:00 |
06:31:45.89 |
+15:15:50.1 |
HIP 31098 |
9.97 |
| 2026-04-09 00:00 |
06:32:00.35 |
+15:16:59.0 |
HIP 31098 |
10.60 |
| 2026-04-09 12:00 |
06:32:14.97 |
+15:18:07.4 |
HIP 31098 |
12.37 |
| 2026-04-10 00:00 |
06:32:29.74 |
+15:19:15.2 |
HIP 31098 |
14.91 |
| 2026-04-10 12:00 |
06:32:44.67 |
+15:20:22.4 |
HIP 31098 |
17.91 |
| 2026-04-11 00:00 |
06:32:59.76 |
+15:21:29.2 |
HIP 31191 |
20.80 |
| 2026-04-11 12:00 |
06:33:15.00 |
+15:22:35.4 |
HIP 31191 |
22.97 |
| 2026-04-12 00:00 |
06:33:30.40 |
+15:23:41.0 |
HIP 31404 |
21.34 |
| 2026-04-12 12:00 |
06:33:45.94 |
+15:24:46.1 |
HIP 31404 |
17.93 |
| 2026-04-13 00:00 |
06:34:01.64 |
+15:25:50.7 |
HIP 31404 |
14.74 |
| 2026-04-13 12:00 |
06:34:17.49 |
+15:26:54.7 |
HIP 31404 |
11.96 |
| 2026-04-14 00:00 |
06:34:33.49 |
+15:27:58.1 |
HIP 31404 |
9.98 |
| 2026-04-14 12:00 |
06:34:49.63 |
+15:29:01.0 |
HIP 31404 |
9.38 |
| 2026-04-15 00:00 |
06:35:05.93 |
+15:30:03.3 |
HIP 31404 |
10.43 |
| 2026-04-15 12:00 |
06:35:22.37 |
+15:31:05.1 |
HIP 31404 |
12.76 |
| 2026-04-16 00:00 |
06:35:38.95 |
+15:32:06.3 |
HIP 31404 |
15.83 |