메타데이터
| 항목 |
값 |
| Designation |
261P/Larson |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-06-17T05:55:39.953280Z |
| Orbit solution date (soln_date, UTC) |
2026-03-31T09:42:39Z |
| Obs used |
1333 |
| NEO |
- |
| M1 |
5.800 |
| K1 |
32.250 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2016-09-27.0000000 |
| e |
0.41834775 |
| q (au) |
2.050551 |
| a (au) |
3.525389 |
| i (deg) |
6.053412 |
| Ω (om, deg) |
294.373787 |
| ω (w, deg) |
62.549411 |
| M (ma, deg) |
212.105953 |
밝기
산란 + 전체 선형
$$
M_a = (10.802 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.802 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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 |
| 2025-05-25 |
2026-02-13 |
+27.6125 |
-9.326 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
05:45:46.17 |
+26:22:24.1 |
HIP 27110 |
11.49 |
| 2026-07-29 12:00 |
05:46:40.17 |
+26:22:26.9 |
HIP 27110 |
23.51 |
| 2026-07-30 00:00 |
05:47:34.03 |
+26:22:28.5 |
HIP 27110 |
35.55 |
| 2026-07-30 12:00 |
05:48:27.76 |
+26:22:29.0 |
HIP 27612 |
36.82 |
| 2026-07-31 00:00 |
05:49:21.36 |
+26:22:28.4 |
HIP 27612 |
27.29 |
| 2026-07-31 12:00 |
05:50:14.82 |
+26:22:26.7 |
HIP 27612 |
20.56 |
| 2026-08-01 00:00 |
05:51:08.15 |
+26:22:23.8 |
HIP 27612 |
19.67 |
| 2026-08-01 12:00 |
05:52:01.33 |
+26:22:19.8 |
HIP 27808 |
15.15 |
| 2026-08-02 00:00 |
05:52:54.38 |
+26:22:14.7 |
HIP 27808 |
5.19 |
| 2026-08-02 12:00 |
05:53:47.29 |
+26:22:08.5 |
HIP 27881 |
4.27 |
| 2026-08-03 00:00 |
05:54:40.07 |
+26:22:01.3 |
HIP 27881 |
9.60 |
| 2026-08-03 12:00 |
05:55:32.70 |
+26:21:52.9 |
HIP 28032 |
7.01 |
| 2026-08-04 00:00 |
05:56:25.19 |
+26:21:43.5 |
HIP 28032 |
12.44 |
| 2026-08-04 12:00 |
05:57:17.54 |
+26:21:33.0 |
HIP 28032 |
23.14 |
| 2026-08-05 00:00 |
05:58:09.74 |
+26:21:21.5 |
HIP 28237 |
24.23 |
| 2026-08-05 12:00 |
05:59:01.80 |
+26:21:08.9 |
HIP 28237 |
27.68 |
| 2026-08-06 00:00 |
05:59:53.72 |
+26:20:55.3 |
HIP 28276 |
33.56 |
| 2026-08-06 12:00 |
06:00:45.49 |
+26:20:40.6 |
HIP 28617 |
23.42 |
| 2026-08-07 00:00 |
06:01:37.11 |
+26:20:24.9 |
HIP 28617 |
12.53 |
| 2026-08-07 12:00 |
06:02:28.58 |
+26:20:08.3 |
HIP 28617 |
5.75 |
| 2026-08-08 00:00 |
06:03:19.90 |
+26:19:50.6 |
HIP 28697 |
12.31 |
| 2026-08-08 12:00 |
06:04:11.08 |
+26:19:31.9 |
HIP 28697 |
14.78 |
| 2026-08-09 00:00 |
06:05:02.10 |
+26:19:12.2 |
HIP 28884 |
18.48 |
| 2026-08-09 12:00 |
06:05:52.96 |
+26:18:51.6 |
HIP 28945 |
9.45 |
| 2026-08-10 00:00 |
06:06:43.68 |
+26:18:30.0 |
HIP 28945 |
2.32 |
| 2026-08-10 12:00 |
06:07:34.23 |
+26:18:07.4 |
HIP 28945 |
13.39 |
| 2026-08-11 00:00 |
06:08:24.63 |
+26:17:43.9 |
HIP 29123 |
19.74 |
| 2026-08-11 12:00 |
06:09:14.88 |
+26:17:19.4 |
HIP 29209 |
13.37 |
| 2026-08-12 00:00 |
06:10:04.96 |
+26:16:54.0 |
HIP 29209 |
14.46 |
| 2026-08-12 12:00 |
06:10:54.88 |
+26:16:27.7 |
HIP 29390 |
14.56 |
| 2026-08-13 00:00 |
06:11:44.64 |
+26:16:00.5 |
HIP 29390 |
11.62 |
| 2026-08-13 12:00 |
06:12:34.24 |
+26:15:32.4 |
HIP 29390 |
17.51 |
| 2026-08-14 00:00 |
06:13:23.68 |
+26:15:03.4 |
HIP 29390 |
26.90 |
| 2026-08-14 12:00 |
06:14:12.94 |
+26:14:33.5 |
HIP 29390 |
37.21 |
| 2026-08-15 00:00 |
06:15:02.05 |
+26:14:02.8 |
HIP 29826 |
28.98 |
| 2026-08-15 12:00 |
06:15:50.98 |
+26:13:31.1 |
HIP 29826 |
20.99 |
| 2026-08-16 00:00 |
06:16:39.75 |
+26:12:58.7 |
HIP 29826 |
16.82 |
| 2026-08-16 12:00 |
06:17:28.35 |
+26:12:25.3 |
HIP 29826 |
19.09 |
| 2026-08-17 00:00 |
06:18:16.78 |
+26:11:51.2 |
HIP 30035 |
18.14 |
| 2026-08-17 12:00 |
06:19:05.04 |
+26:11:16.2 |
HIP 30035 |
12.48 |
| 2026-08-18 00:00 |
06:19:53.13 |
+26:10:40.4 |
HIP 30035 |
14.73 |
| 2026-08-18 12:00 |
06:20:41.04 |
+26:10:03.8 |
HIP 30035 |
22.59 |
| 2026-08-19 00:00 |
06:21:28.78 |
+26:09:26.5 |
HIP 30346 |
22.48 |