메타데이터
| 항목 |
값 |
| Designation |
239P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-01-09T23:17:42.864000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:01Z |
| Obs used |
365 |
| NEO |
- |
| M1 |
15.300 |
| K1 |
13.250 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2016-10-04.0000000 |
| e |
0.63143654 |
| q (au) |
1.647599 |
| a (au) |
4.470327 |
| i (deg) |
11.305620 |
| Ω (om, deg) |
255.944518 |
| ω (w, deg) |
220.383718 |
| M (ma, deg) |
273.660407 |
밝기
산란 + 전체 선형
$$
M_a = (18.785 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
18.785 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.656 |
| 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 |
| 2018-10-08 |
2019-01-09 |
+4.7782 |
-0.935 |
| 2019-01-11 |
2019-04-18 |
-10.8877 |
+2.304 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
22:02:56.48 |
+02:42:34.9 |
HIP 108940 |
21.18 |
| 2026-09-20 12:00 |
22:02:40.99 |
+02:40:33.5 |
HIP 108940 |
24.47 |
| 2026-09-21 00:00 |
22:02:25.61 |
+02:38:32.0 |
HIP 108655 |
27.64 |
| 2026-09-21 12:00 |
22:02:10.36 |
+02:36:30.3 |
HIP 108655 |
24.90 |
| 2026-09-22 00:00 |
22:01:55.23 |
+02:34:28.5 |
HIP 108655 |
22.68 |
| 2026-09-22 12:00 |
22:01:40.22 |
+02:32:26.7 |
HIP 108655 |
21.14 |
| 2026-09-23 00:00 |
22:01:25.34 |
+02:30:24.7 |
HIP 108655 |
20.40 |
| 2026-09-23 12:00 |
22:01:10.59 |
+02:28:22.6 |
HIP 108655 |
20.54 |
| 2026-09-24 00:00 |
22:00:55.97 |
+02:26:20.5 |
HIP 108655 |
21.53 |
| 2026-09-24 12:00 |
22:00:41.49 |
+02:24:18.3 |
HIP 108526 |
23.07 |
| 2026-09-25 00:00 |
22:00:27.14 |
+02:22:16.2 |
HIP 108526 |
19.57 |
| 2026-09-25 12:00 |
22:00:12.93 |
+02:20:14.0 |
HIP 108526 |
16.38 |
| 2026-09-26 00:00 |
21:59:58.85 |
+02:18:11.8 |
HIP 108526 |
13.72 |
| 2026-09-26 12:00 |
21:59:44.92 |
+02:16:09.7 |
HIP 108526 |
11.91 |
| 2026-09-27 00:00 |
21:59:31.14 |
+02:14:07.7 |
HIP 108526 |
11.33 |
| 2026-09-27 12:00 |
21:59:17.50 |
+02:12:05.7 |
HIP 108526 |
12.12 |
| 2026-09-28 00:00 |
21:59:04.00 |
+02:10:03.8 |
HIP 108526 |
14.03 |
| 2026-09-28 12:00 |
21:58:50.66 |
+02:08:02.0 |
HIP 108526 |
16.65 |
| 2026-09-29 00:00 |
21:58:37.46 |
+02:06:00.3 |
HIP 108526 |
19.68 |
| 2026-09-29 12:00 |
21:58:24.42 |
+02:03:58.8 |
HIP 108526 |
22.95 |
| 2026-09-30 00:00 |
21:58:11.54 |
+02:01:57.4 |
HIP 108526 |
26.35 |
| 2026-09-30 12:00 |
21:57:58.81 |
+01:59:56.2 |
HIP 108526 |
29.82 |
| 2026-10-01 00:00 |
21:57:46.23 |
+01:57:55.2 |
HIP 108526 |
33.32 |
| 2026-10-01 12:00 |
21:57:33.82 |
+01:55:54.4 |
HIP 108526 |
36.85 |
| 2026-10-02 00:00 |
21:57:21.57 |
+01:53:53.9 |
HIP 108237 |
37.85 |
| 2026-10-02 12:00 |
21:57:09.49 |
+01:51:53.5 |
HIP 108237 |
37.44 |
| 2026-10-03 00:00 |
21:56:57.56 |
+01:49:53.5 |
HIP 108237 |
37.40 |
| 2026-10-03 12:00 |
21:56:45.81 |
+01:47:53.7 |
HIP 108237 |
37.71 |
| 2026-10-04 00:00 |
21:56:34.23 |
+01:45:54.2 |
HIP 108237 |
38.36 |
| 2026-10-04 12:00 |
21:56:22.81 |
+01:43:55.1 |
HIP 108237 |
39.32 |
| 2026-10-05 00:00 |
21:56:11.57 |
+01:41:56.2 |
HIP 108237 |
40.56 |
| 2026-10-05 12:00 |
21:56:00.50 |
+01:39:57.8 |
HIP 108237 |
42.05 |
| 2026-10-06 00:00 |
21:55:49.61 |
+01:37:59.7 |
HIP 108237 |
43.74 |
| 2026-10-06 12:00 |
21:55:38.89 |
+01:36:02.0 |
HIP 108237 |
45.62 |
| 2026-10-07 00:00 |
21:55:28.36 |
+01:34:04.6 |
HIP 108237 |
47.64 |
| 2026-10-07 12:00 |
21:55:18.00 |
+01:32:07.8 |
HIP 107951 |
47.09 |
| 2026-10-08 00:00 |
21:55:07.83 |
+01:30:11.3 |
HIP 107951 |
44.29 |
| 2026-10-08 12:00 |
21:54:57.84 |
+01:28:15.3 |
HIP 107951 |
41.60 |
| 2026-10-09 00:00 |
21:54:48.03 |
+01:26:19.8 |
HIP 107951 |
39.02 |
| 2026-10-09 12:00 |
21:54:38.41 |
+01:24:24.8 |
HIP 107951 |
36.58 |
| 2026-10-10 00:00 |
21:54:28.98 |
+01:22:30.3 |
HIP 107951 |
34.28 |
| 2026-10-10 12:00 |
21:54:19.73 |
+01:20:36.3 |
HIP 107951 |
32.16 |
| 2026-10-11 00:00 |
21:54:10.68 |
+01:18:42.8 |
HIP 107951 |
30.22 |